<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:9f24079e-5abb-41df-ae62-8aec4aa86ed9,g:3efaf94c-0b8f-42e3-a253-1a4fe8e9300f-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.swgas.com/role/Cover" xlink:type="simple" xlink:href="swx-20210930.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_600dc5a7-30b4-4e79-8680-d7e132364809" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_084b8c99-be7f-446f-8482-0ccc151ce25b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntitiesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_600dc5a7-30b4-4e79-8680-d7e132364809" xlink:to="loc_dei_EntitiesTable_084b8c99-be7f-446f-8482-0ccc151ce25b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_32ced2a3-6acc-4395-9008-84fd0d20a110" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_084b8c99-be7f-446f-8482-0ccc151ce25b" xlink:to="loc_dei_LegalEntityAxis_32ced2a3-6acc-4395-9008-84fd0d20a110" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bd3ae0e8-bb53-4aed-bf15-3a316204d0d5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_32ced2a3-6acc-4395-9008-84fd0d20a110" xlink:to="loc_dei_EntityDomain_bd3ae0e8-bb53-4aed-bf15-3a316204d0d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_ae1d087d-cac3-42b6-8b98-7288d5c9acbd" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_bd3ae0e8-bb53-4aed-bf15-3a316204d0d5" xlink:to="loc_swx_SouthwestGasCorporationMember_ae1d087d-cac3-42b6-8b98-7288d5c9acbd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_99af5622-9e4c-4f60-8930-3fb9835a2fa1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_084b8c99-be7f-446f-8482-0ccc151ce25b" xlink:to="loc_us-gaap_StatementClassOfStockAxis_99af5622-9e4c-4f60-8930-3fb9835a2fa1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_65c3bca0-725b-4ee4-838f-c2f5a102088f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementClassOfStockAxis_99af5622-9e4c-4f60-8930-3fb9835a2fa1" xlink:to="loc_us-gaap_ClassOfStockDomain_65c3bca0-725b-4ee4-838f-c2f5a102088f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_bd0d8a7a-5d53-4616-a70e-88e9b958cc59" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_65c3bca0-725b-4ee4-838f-c2f5a102088f" xlink:to="loc_us-gaap_CommonStockMember_bd0d8a7a-5d53-4616-a70e-88e9b958cc59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_PreferredStockPurchaseRightsMember_833b1f36-5ab3-4917-a32f-0035e977a471" xlink:href="swx-20210930.xsd#swx_PreferredStockPurchaseRightsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_65c3bca0-725b-4ee4-838f-c2f5a102088f" xlink:to="loc_swx_PreferredStockPurchaseRightsMember_833b1f36-5ab3-4917-a32f-0035e977a471" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityInformationLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_084b8c99-be7f-446f-8482-0ccc151ce25b" xlink:to="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_60f0b226-92f2-4d4b-be5c-d895eb90d3ec" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_DocumentType_60f0b226-92f2-4d4b-be5c-d895eb90d3ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_8569f294-81b0-42a2-a8ef-86704b773975" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentQuarterlyReport"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_DocumentQuarterlyReport_8569f294-81b0-42a2-a8ef-86704b773975" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_c45f9bee-9e18-4d8a-a18f-c9e95d44ea1b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_DocumentPeriodEndDate_c45f9bee-9e18-4d8a-a18f-c9e95d44ea1b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_5a70eec8-c296-43b7-b41d-687eb5c311ed" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentTransitionReport"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_DocumentTransitionReport_5a70eec8-c296-43b7-b41d-687eb5c311ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_9441ddd8-7f91-4a0b-a841-504466630150" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityFileNumber_9441ddd8-7f91-4a0b-a841-504466630150" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_3b3eb53e-cbfc-4c5d-a0c9-0f19714cde63" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityRegistrantName_3b3eb53e-cbfc-4c5d-a0c9-0f19714cde63" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_0103760f-99dd-4df2-846f-f5b35fb1e1f5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityIncorporationStateCountryCode_0103760f-99dd-4df2-846f-f5b35fb1e1f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_56736226-4e20-4126-aaca-83b2bfe70d6b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityTaxIdentificationNumber_56736226-4e20-4126-aaca-83b2bfe70d6b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_85e8d694-73e9-4571-ba92-356cd14cee39" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityAddressAddressLine1_85e8d694-73e9-4571-ba92-356cd14cee39" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_ce8983df-fb77-4fc0-a15f-297ea13ee168" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine2"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityAddressAddressLine2_ce8983df-fb77-4fc0-a15f-297ea13ee168" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_cd16d0b6-2164-4127-be37-5bba9b2db4ab" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityAddressCityOrTown_cd16d0b6-2164-4127-be37-5bba9b2db4ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_f247249a-6eb3-4fa9-b44d-28caf0399cde" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityAddressStateOrProvince_f247249a-6eb3-4fa9-b44d-28caf0399cde" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_b95140b3-f5c2-41ed-b2e8-06a39784140d" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityAddressPostalZipCode_b95140b3-f5c2-41ed-b2e8-06a39784140d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_45927183-793a-4d21-8d3f-71fb326f2a13" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_CityAreaCode_45927183-793a-4d21-8d3f-71fb326f2a13" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_59cb55de-1a50-428b-9549-652e536ac83f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_LocalPhoneNumber_59cb55de-1a50-428b-9549-652e536ac83f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_c9ed8c3a-8932-48fa-904f-7a996b1e9507" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_Security12bTitle_c9ed8c3a-8932-48fa-904f-7a996b1e9507" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_080f76c4-1e75-4072-b8b1-d13b44965af1" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_TradingSymbol_080f76c4-1e75-4072-b8b1-d13b44965af1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag_3545f3f1-e751-43eb-b7af-5b1d13af6290" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_NoTradingSymbolFlag"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_NoTradingSymbolFlag_3545f3f1-e751-43eb-b7af-5b1d13af6290" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_be1a842b-e719-443a-9ef0-47c55310dea3" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_SecurityExchangeName_be1a842b-e719-443a-9ef0-47c55310dea3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_ff654a52-9ade-467e-9dcf-2db43f0a402f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCurrentReportingStatus"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityCurrentReportingStatus_ff654a52-9ade-467e-9dcf-2db43f0a402f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_bae04cac-928a-45da-b3f6-f107317f534e" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityInteractiveDataCurrent_bae04cac-928a-45da-b3f6-f107317f534e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_b99b8e67-1c34-47db-a10d-916ad145cf85" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFilerCategory"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityFilerCategory_b99b8e67-1c34-47db-a10d-916ad145cf85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_5b795d57-f591-4fd8-9e15-765b264d8827" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntitySmallBusiness"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntitySmallBusiness_5b795d57-f591-4fd8-9e15-765b264d8827" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_72338fcb-6862-46e3-aa52-2c64ceea2f12" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityEmergingGrowthCompany_72338fcb-6862-46e3-aa52-2c64ceea2f12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_f2a5a51a-3d11-433e-8de0-33f3c4a8d1bb" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityShellCompany"/>
    <link:presentationArc order="25" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityShellCompany_f2a5a51a-3d11-433e-8de0-33f3c4a8d1bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_89916e74-31bf-4ecd-9367-abd8db1aaf13" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:presentationArc order="26" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_89916e74-31bf-4ecd-9367-abd8db1aaf13" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_39789758-87f3-4074-a4be-ea1a59749409" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="27" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_EntityCentralIndexKey_39789758-87f3-4074-a4be-ea1a59749409" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_e3611ce7-c00d-4fed-90fe-335f43574485" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentFiscalYearFocus"/>
    <link:presentationArc order="28" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_DocumentFiscalYearFocus_e3611ce7-c00d-4fed-90fe-335f43574485" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_8ce98e56-45ae-465a-bc3c-e513a67c4d9e" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:presentationArc order="29" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_DocumentFiscalPeriodFocus_8ce98e56-45ae-465a-bc3c-e513a67c4d9e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_c04b8e46-e41f-4597-bae8-47443d5f2641" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_AmendmentFlag_c04b8e46-e41f-4597-bae8-47443d5f2641" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_ab21353a-97f1-41de-a6fc-be726df071da" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:presentationArc order="31" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_a12795c7-a295-495d-8ed8-40dddb71cf51" xlink:to="loc_dei_CurrentFiscalYearEndDate_ab21353a-97f1-41de-a6fc-be726df071da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="swx-20210930.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_62cf6046-f083-40aa-9976-3ff6dcfa9654" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_598474e1-b3a0-431e-95cb-964980fcc486" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_62cf6046-f083-40aa-9976-3ff6dcfa9654" xlink:to="loc_us-gaap_StatementTable_598474e1-b3a0-431e-95cb-964980fcc486" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_20058286-a777-43d7-8a37-a85b87aa7123" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_598474e1-b3a0-431e-95cb-964980fcc486" xlink:to="loc_dei_LegalEntityAxis_20058286-a777-43d7-8a37-a85b87aa7123" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c4ea127f-0d83-496e-ab9b-d83437d9f909" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_20058286-a777-43d7-8a37-a85b87aa7123" xlink:to="loc_dei_EntityDomain_c4ea127f-0d83-496e-ab9b-d83437d9f909" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_5f55c9fb-1019-4900-8df2-028685880dd1" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_c4ea127f-0d83-496e-ab9b-d83437d9f909" xlink:to="loc_swx_SouthwestGasCorporationMember_5f55c9fb-1019-4900-8df2-028685880dd1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_d5e27145-79be-486b-8045-88a44064e4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_598474e1-b3a0-431e-95cb-964980fcc486" xlink:to="loc_us-gaap_StatementLineItems_d5e27145-79be-486b-8045-88a44064e4ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_918a4b0e-43e8-4526-b3f9-e8418562b457" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_d5e27145-79be-486b-8045-88a44064e4ee" xlink:to="loc_us-gaap_AssetsAbstract_918a4b0e-43e8-4526-b3f9-e8418562b457" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNetAbstract_ddc54e2d-251b-4f71-a009-96b3c2294021" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNetAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_918a4b0e-43e8-4526-b3f9-e8418562b457" xlink:to="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNetAbstract_ddc54e2d-251b-4f71-a009-96b3c2294021" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_PublicUtilitiesPropertyPlantAndEquipmentGasPlant_3de511c4-3580-43d2-86d2-97b470723e4c" xlink:href="swx-20210930.xsd#swx_PublicUtilitiesPropertyPlantAndEquipmentGasPlant"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNetAbstract_ddc54e2d-251b-4f71-a009-96b3c2294021" xlink:to="loc_swx_PublicUtilitiesPropertyPlantAndEquipmentGasPlant_3de511c4-3580-43d2-86d2-97b470723e4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation_00768271-edec-4c3d-b1e2-5a12633124b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNetAbstract_ddc54e2d-251b-4f71-a009-96b3c2294021" xlink:to="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation_00768271-edec-4c3d-b1e2-5a12633124b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress_f90e962e-3512-486d-a53b-20e77e0e6c33" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNetAbstract_ddc54e2d-251b-4f71-a009-96b3c2294021" xlink:to="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress_f90e962e-3512-486d-a53b-20e77e0e6c33" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_e53eb24e-992d-405b-a83e-fe94683b5058" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNetAbstract_ddc54e2d-251b-4f71-a009-96b3c2294021" xlink:to="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_e53eb24e-992d-405b-a83e-fe94683b5058" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherPropertyAndInvestments_c0ca638d-f913-4251-bf1c-38347b0f9830" xlink:href="swx-20210930.xsd#swx_OtherPropertyAndInvestments"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_918a4b0e-43e8-4526-b3f9-e8418562b457" xlink:to="loc_swx_OtherPropertyAndInvestments_c0ca638d-f913-4251-bf1c-38347b0f9830" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_918a4b0e-43e8-4526-b3f9-e8418562b457" xlink:to="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_a2b18e5a-e99f-4142-a0ae-97e90722c0f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_a2b18e5a-e99f-4142-a0ae-97e90722c0f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_08f8f91b-307a-4d27-9262-f2e91c55835c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_08f8f91b-307a-4d27-9262-f2e91c55835c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AccruedUtilityRevenue_eeb63668-dcfc-4b7c-acf2-60155c47611c" xlink:href="swx-20210930.xsd#swx_AccruedUtilityRevenue"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:to="loc_swx_AccruedUtilityRevenue_eeb63668-dcfc-4b7c-acf2-60155c47611c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivable_beadb3e2-15b3-4806-b697-f29f98b77eec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesReceivable"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:to="loc_us-gaap_IncomeTaxesReceivable_beadb3e2-15b3-4806-b697-f29f98b77eec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredGasCost_cebe5112-3914-4fcf-b6aa-47627a08b9eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredGasCost"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:to="loc_us-gaap_DeferredGasCost_cebe5112-3914-4fcf-b6aa-47627a08b9eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_645338dd-4527-4480-87c4-b364a5d1c4fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_645338dd-4527-4480-87c4-b364a5d1c4fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_edc35cce-8a49-41e7-92c9-c2b1e9322ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_364c7586-3466-4830-9603-0c3b46c70dda" xlink:to="loc_us-gaap_AssetsCurrent_edc35cce-8a49-41e7-92c9-c2b1e9322ee4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_fde9fbd7-ffc6-4ef9-878b-076abd91ebce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsNoncurrentAbstract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_918a4b0e-43e8-4526-b3f9-e8418562b457" xlink:to="loc_us-gaap_AssetsNoncurrentAbstract_fde9fbd7-ffc6-4ef9-878b-076abd91ebce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_590c5e9c-565e-4481-ae7b-bae5b7cfd245" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_fde9fbd7-ffc6-4ef9-878b-076abd91ebce" xlink:to="loc_us-gaap_Goodwill_590c5e9c-565e-4481-ae7b-bae5b7cfd245" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_98b03629-ed97-47da-87e0-6423d817aad8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_fde9fbd7-ffc6-4ef9-878b-076abd91ebce" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_98b03629-ed97-47da-87e0-6423d817aad8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_f6ed46ae-c88d-4c81-a614-5e72fa5b38e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_fde9fbd7-ffc6-4ef9-878b-076abd91ebce" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_f6ed46ae-c88d-4c81-a614-5e72fa5b38e6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment_ef4b2bb1-d5ee-4b98-b644-32fb51083101" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_fde9fbd7-ffc6-4ef9-878b-076abd91ebce" xlink:to="loc_us-gaap_AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment_ef4b2bb1-d5ee-4b98-b644-32fb51083101" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_6cb2962d-31a8-4549-9f00-60ad08448a2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_918a4b0e-43e8-4526-b3f9-e8418562b457" xlink:to="loc_us-gaap_Assets_6cb2962d-31a8-4549-9f00-60ad08448a2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_c369feff-f102-45e3-ba0f-d104265bc1d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_d5e27145-79be-486b-8045-88a44064e4ee" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_c369feff-f102-45e3-ba0f-d104265bc1d7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizationLongtermDebtAndEquityAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_c369feff-f102-45e3-ba0f-d104265bc1d7" xlink:to="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_6c1d0051-8a21-412f-b661-391f087e7fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_CommonStockValue_6c1d0051-8a21-412f-b661-391f087e7fcf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_8557d942-f439-4ea4-bd52-2f58c7d4632f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_8557d942-f439-4ea4-bd52-2f58c7d4632f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_cd36634b-2b7f-4031-9c2e-7a0cba191052" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_cd36634b-2b7f-4031-9c2e-7a0cba191052" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_ff3b0a5b-91ea-46e1-a74c-cf9fe4d043a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_ff3b0a5b-91ea-46e1-a74c-cf9fe4d043a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_e21a6371-b506-4c61-8ea7-54639985aef7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_StockholdersEquity_e21a6371-b506-4c61-8ea7-54639985aef7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_4d7b79e0-827a-46f5-8103-2ef7a5f47e4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_4d7b79e0-827a-46f5-8103-2ef7a5f47e4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_1d44cedc-0235-42db-98a7-c2ad24d9c148" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_1d44cedc-0235-42db-98a7-c2ad24d9c148" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizationLongtermDebtAndEquity_e0ece614-1e9b-4b0f-b897-f135e761d41f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizationLongtermDebtAndEquity"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizationLongtermDebtAndEquityAbstract_2df14cce-5237-47fd-91ca-d6a3db465189" xlink:to="loc_us-gaap_CapitalizationLongtermDebtAndEquity_e0ece614-1e9b-4b0f-b897-f135e761d41f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_c369feff-f102-45e3-ba0f-d104265bc1d7" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_f0c8b53c-1d62-4ee7-9658-c0d9437b3ef5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_LongTermDebtCurrent_f0c8b53c-1d62-4ee7-9658-c0d9437b3ef5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_8fcf7055-72a8-490f-aefb-afdf7feb87aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_ShortTermBorrowings_8fcf7055-72a8-490f-aefb-afdf7feb87aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_7ce8cf87-3d97-452a-b638-bd20c0dae0dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_AccountsPayableCurrent_7ce8cf87-3d97-452a-b638-bd20c0dae0dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_fc811181-ef00-4631-b1bc-e5b18424a17b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_fc811181-ef00-4631-b1bc-e5b18424a17b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_1e75d183-1fd9-48fd-93cb-61672f706b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_1e75d183-1fd9-48fd-93cb-61672f706b4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_1f4f4932-7392-408e-9805-da45a48a0dec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_1f4f4932-7392-408e-9805-da45a48a0dec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrent_924800e5-7abd-4dcf-b3a3-f58a72e1fd4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPayableCurrent"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_InterestPayableCurrent_924800e5-7abd-4dcf-b3a3-f58a72e1fd4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredGasPurchasesCurrent_fa144d5c-df0c-4e73-a0c2-d36decc597bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredGasPurchasesCurrent"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_DeferredGasPurchasesCurrent_fa144d5c-df0c-4e73-a0c2-d36decc597bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToAffiliateCurrent_b6137c61-42ae-4e4e-80ef-9862e2eb88c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DueToAffiliateCurrent"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_DueToAffiliateCurrent_b6137c61-42ae-4e4e-80ef-9862e2eb88c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_6147b59f-5f0a-482a-a5cc-84baa1d49154" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_6147b59f-5f0a-482a-a5cc-84baa1d49154" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_de255c4f-8db6-466d-9d5e-e924b838ccb0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b1b7df20-ffb6-44a4-8420-04558b13ad3f" xlink:to="loc_us-gaap_LiabilitiesCurrent_de255c4f-8db6-466d-9d5e-e924b838ccb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_6f041986-2a9b-4fb9-8371-4452e293aa14" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrentAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_c369feff-f102-45e3-ba0f-d104265bc1d7" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_6f041986-2a9b-4fb9-8371-4452e293aa14" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DeferredIncomeTaxesAndUnamortizedInvestmentTaxCredits_5634845c-7913-4e40-8318-30652025341c" xlink:href="swx-20210930.xsd#swx_DeferredIncomeTaxesAndUnamortizedInvestmentTaxCredits"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_6f041986-2a9b-4fb9-8371-4452e293aa14" xlink:to="loc_swx_DeferredIncomeTaxesAndUnamortizedInvestmentTaxCredits_5634845c-7913-4e40-8318-30652025341c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_5506bd28-4adb-46bd-aea5-b28a07e854b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAccruedLiabilitiesNoncurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_6f041986-2a9b-4fb9-8371-4452e293aa14" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_5506bd28-4adb-46bd-aea5-b28a07e854b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent_d3234d9d-927f-4eb8-821c-c6b3f6539779" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_6f041986-2a9b-4fb9-8371-4452e293aa14" xlink:to="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent_d3234d9d-927f-4eb8-821c-c6b3f6539779" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_f9c19ff9-7df0-4917-a4a5-3a2b3384fc88" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_6f041986-2a9b-4fb9-8371-4452e293aa14" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_f9c19ff9-7df0-4917-a4a5-3a2b3384fc88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_be4006a2-50dc-4478-a457-417ed34dd2e3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_c369feff-f102-45e3-ba0f-d104265bc1d7" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_be4006a2-50dc-4478-a457-417ed34dd2e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="swx-20210930.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_575ca455-5ad5-4394-bf74-d90f86e65ffe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_52a5076b-83b2-44bf-ab1e-17a2925b30d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_575ca455-5ad5-4394-bf74-d90f86e65ffe" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_52a5076b-83b2-44bf-ab1e-17a2925b30d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_f4e9534c-7ffa-4017-978d-ce317bdc16cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_575ca455-5ad5-4394-bf74-d90f86e65ffe" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_f4e9534c-7ffa-4017-978d-ce317bdc16cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_03ff5964-a058-4773-b2eb-27c2d381aa6f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_575ca455-5ad5-4394-bf74-d90f86e65ffe" xlink:to="loc_us-gaap_CommonStockSharesIssued_03ff5964-a058-4773-b2eb-27c2d381aa6f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_27ef51c9-539c-4de3-825a-e405caf94ac3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_575ca455-5ad5-4394-bf74-d90f86e65ffe" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_27ef51c9-539c-4de3-825a-e405caf94ac3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="simple" xlink:href="swx-20210930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract_bc91620d-443d-4189-9fdc-efde3bf2cc11" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_e0dccbd6-f76c-4c21-b668-1d2ef93035ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_bc91620d-443d-4189-9fdc-efde3bf2cc11" xlink:to="loc_us-gaap_StatementTable_e0dccbd6-f76c-4c21-b668-1d2ef93035ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_10ae2010-1ca5-4fb0-8634-c2bd80d8c115" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_e0dccbd6-f76c-4c21-b668-1d2ef93035ed" xlink:to="loc_dei_LegalEntityAxis_10ae2010-1ca5-4fb0-8634-c2bd80d8c115" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d1dc3f7e-f8b7-473e-adb5-cfe5f59da399" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_10ae2010-1ca5-4fb0-8634-c2bd80d8c115" xlink:to="loc_dei_EntityDomain_d1dc3f7e-f8b7-473e-adb5-cfe5f59da399" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_864225db-0585-4a52-a9bf-fc4806c79618" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_d1dc3f7e-f8b7-473e-adb5-cfe5f59da399" xlink:to="loc_swx_SouthwestGasCorporationMember_864225db-0585-4a52-a9bf-fc4806c79618" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_e0dccbd6-f76c-4c21-b668-1d2ef93035ed" xlink:to="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_a9d49e8a-c732-45d4-b7ea-ce69f45a0dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_RevenuesAbstract_a9d49e8a-c732-45d4-b7ea-ce69f45a0dbf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatedOperatingRevenueGas_597d59a7-4acf-4958-ac52-69eefbd6e890" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RegulatedOperatingRevenueGas"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesAbstract_a9d49e8a-c732-45d4-b7ea-ce69f45a0dbf" xlink:to="loc_us-gaap_RegulatedOperatingRevenueGas_597d59a7-4acf-4958-ac52-69eefbd6e890" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_RegulatedOperatingRevenueUtilityInfrastructureServices_eac36e6a-bda3-4721-8524-e22e6fcfabec" xlink:href="swx-20210930.xsd#swx_RegulatedOperatingRevenueUtilityInfrastructureServices"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesAbstract_a9d49e8a-c732-45d4-b7ea-ce69f45a0dbf" xlink:to="loc_swx_RegulatedOperatingRevenueUtilityInfrastructureServices_eac36e6a-bda3-4721-8524-e22e6fcfabec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatedAndUnregulatedOperatingRevenue_6e2e4f92-1308-4eee-81d1-43c8bdd2ce1e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RegulatedAndUnregulatedOperatingRevenue"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesAbstract_a9d49e8a-c732-45d4-b7ea-ce69f45a0dbf" xlink:to="loc_us-gaap_RegulatedAndUnregulatedOperatingRevenue_6e2e4f92-1308-4eee-81d1-43c8bdd2ce1e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased_c4eb24de-d9fb-4032-a205-875c2adbe891" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:to="loc_us-gaap_UtilitiesOperatingExpenseGasAndPetroleumPurchased_c4eb24de-d9fb-4032-a205-875c2adbe891" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations_b8c33942-5681-422c-9d8e-c17bd4ace0b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:to="loc_us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations_b8c33942-5681-422c-9d8e-c17bd4ace0b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_48ae4220-830e-418e-beb5-a92336c9ce2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:to="loc_us-gaap_DepreciationAndAmortization_48ae4220-830e-418e-beb5-a92336c9ce2d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesExcludingIncomeAndExciseTaxes_a0d56187-4609-422f-b9b7-f31f853bb560" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxesExcludingIncomeAndExciseTaxes"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:to="loc_us-gaap_TaxesExcludingIncomeAndExciseTaxes_a0d56187-4609-422f-b9b7-f31f853bb560" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_411aff5b-3f69-4dba-ab3d-dee04f9c48cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_411aff5b-3f69-4dba-ab3d-dee04f9c48cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_22f6572d-c664-46ae-9f25-1058fbd3a0fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_ffe908b9-86a6-401c-8f51-cd2d04f1be91" xlink:to="loc_us-gaap_CostsAndExpenses_22f6572d-c664-46ae-9f25-1058fbd3a0fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_888a98f3-c6a1-44ae-876f-b547c370ace1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_OperatingIncomeLoss_888a98f3-c6a1-44ae-876f-b547c370ace1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_f9febca5-3c02-4a50-8c24-b66e0c0c4696" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_f9febca5-3c02-4a50-8c24-b66e0c0c4696" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_3a62ea6d-5c1c-4f3d-a41d-3341b9eca020" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpense"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_f9febca5-3c02-4a50-8c24-b66e0c0c4696" xlink:to="loc_us-gaap_InterestExpense_3a62ea6d-5c1c-4f3d-a41d-3341b9eca020" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_d8d549bb-587c-4a20-b15a-e7938923fcf0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_f9febca5-3c02-4a50-8c24-b66e0c0c4696" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_d8d549bb-587c-4a20-b15a-e7938923fcf0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_cd386726-dd31-4b52-9169-b2d5abc0ea63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_f9febca5-3c02-4a50-8c24-b66e0c0c4696" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_cd386726-dd31-4b52-9169-b2d5abc0ea63" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8d07b774-6291-4e86-8daf-f7e7d15012a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8d07b774-6291-4e86-8daf-f7e7d15012a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_7b1caf9d-c2ce-496a-9ec8-487236024dda" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_7b1caf9d-c2ce-496a-9ec8-487236024dda" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_e58a978f-45bf-400f-bc67-6aa7ac6160f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_ProfitLoss_e58a978f-45bf-400f-bc67-6aa7ac6160f6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4592ac77-ea60-4d09-b283-61bfe57115db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4592ac77-ea60-4d09-b283-61bfe57115db" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c30006cb-6e11-4423-9cab-f8a98b794583" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_NetIncomeLoss_c30006cb-6e11-4423-9cab-f8a98b794583" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_58097e00-86e3-4cfa-8df9-3f34c6cf0c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_EarningsPerShareAbstract_58097e00-86e3-4cfa-8df9-3f34c6cf0c4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_b53455b1-5000-498e-9565-c92e54ababaf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_58097e00-86e3-4cfa-8df9-3f34c6cf0c4e" xlink:to="loc_us-gaap_EarningsPerShareBasic_b53455b1-5000-498e-9565-c92e54ababaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_9881240b-5356-475b-8cd8-aecc4d5e259f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_58097e00-86e3-4cfa-8df9-3f34c6cf0c4e" xlink:to="loc_us-gaap_EarningsPerShareDiluted_9881240b-5356-475b-8cd8-aecc4d5e259f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_ff0ede83-db1a-4567-8945-4b05187769ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_56bc4bb2-74cd-4716-9500-a9af7700b5a2" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_ff0ede83-db1a-4567-8945-4b05187769ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1c5ded24-3e0f-4405-8674-316e14a26936" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_ff0ede83-db1a-4567-8945-4b05187769ac" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1c5ded24-3e0f-4405-8674-316e14a26936" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_fa6c3a68-a071-45ef-aefd-64eda8a0dd35" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_ff0ede83-db1a-4567-8945-4b05187769ac" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_fa6c3a68-a071-45ef-aefd-64eda8a0dd35" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="swx-20210930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_b61de200-3ded-42ec-9ec8-243f9a99f45d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_a75920d7-eed9-426c-9052-7fc2a2e297e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_b61de200-3ded-42ec-9ec8-243f9a99f45d" xlink:to="loc_us-gaap_StatementTable_a75920d7-eed9-426c-9052-7fc2a2e297e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_80dbadbe-c1d6-4bc2-89b4-c2df98525032" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_a75920d7-eed9-426c-9052-7fc2a2e297e9" xlink:to="loc_dei_LegalEntityAxis_80dbadbe-c1d6-4bc2-89b4-c2df98525032" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_fa7db1ba-99bf-4021-b48e-9eb213e78310" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_80dbadbe-c1d6-4bc2-89b4-c2df98525032" xlink:to="loc_dei_EntityDomain_fa7db1ba-99bf-4021-b48e-9eb213e78310" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_dfce3111-d33e-420f-a9cf-e07f812c55fc" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_fa7db1ba-99bf-4021-b48e-9eb213e78310" xlink:to="loc_swx_SouthwestGasCorporationMember_dfce3111-d33e-420f-a9cf-e07f812c55fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_a14463cc-a2ec-4f1e-9aae-ae98fe062fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_a75920d7-eed9-426c-9052-7fc2a2e297e9" xlink:to="loc_us-gaap_StatementLineItems_a14463cc-a2ec-4f1e-9aae-ae98fe062fa4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_39397051-8da6-4aab-95c7-e79b41f0065d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a14463cc-a2ec-4f1e-9aae-ae98fe062fa4" xlink:to="loc_us-gaap_ProfitLoss_39397051-8da6-4aab-95c7-e79b41f0065d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_6b07f0ac-3280-447b-b97d-f018212ae599" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a14463cc-a2ec-4f1e-9aae-ae98fe062fa4" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_6b07f0ac-3280-447b-b97d-f018212ae599" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_6b07f0ac-3280-447b-b97d-f018212ae599" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_a8065d11-6c45-4454-8445-04a382868131" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_a8065d11-6c45-4454-8445-04a382868131" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_6933fecd-8ff3-4974-9a18-fbd9b55fd92b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_6933fecd-8ff3-4974-9a18-fbd9b55fd92b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_ad2d6230-80db-457e-9784-d2c7a9aa25ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_ad2d6230-80db-457e-9784-d2c7a9aa25ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_7433eb99-c2fd-4d42-9340-70061ef0a4b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_7433eb99-c2fd-4d42-9340-70061ef0a4b0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherComprehensiveIncomeDefinedBenefitPlansRegulatoryAdjustmentNetOfTax_f277f1fd-9f07-4bca-8b11-0dd2837de813" xlink:href="swx-20210930.xsd#swx_OtherComprehensiveIncomeDefinedBenefitPlansRegulatoryAdjustmentNetOfTax"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:to="loc_swx_OtherComprehensiveIncomeDefinedBenefitPlansRegulatoryAdjustmentNetOfTax_f277f1fd-9f07-4bca-8b11-0dd2837de813" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_03d7c69c-acdd-415e-a3bd-8de7b22d5f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_20cd643c-74a6-4a65-ab48-dd3f4a3348c9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_03d7c69c-acdd-415e-a3bd-8de7b22d5f2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract_df445043-bebb-4bae-a67c-6529dde0c697" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_6b07f0ac-3280-447b-b97d-f018212ae599" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract_df445043-bebb-4bae-a67c-6529dde0c697" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_ca8ce8b6-b9f9-4fee-bdf2-08fc14347c99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract_df445043-bebb-4bae-a67c-6529dde0c697" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_ca8ce8b6-b9f9-4fee-bdf2-08fc14347c99" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_c1144bd1-8d63-4294-81aa-0be7d0a238c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract_df445043-bebb-4bae-a67c-6529dde0c697" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_c1144bd1-8d63-4294-81aa-0be7d0a238c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_dce3948c-4555-4afa-9025-3d06732cb336" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_6b07f0ac-3280-447b-b97d-f018212ae599" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_dce3948c-4555-4afa-9025-3d06732cb336" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_37fc217a-b11c-47bc-ae69-2c70f66d5c2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_6b07f0ac-3280-447b-b97d-f018212ae599" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_37fc217a-b11c-47bc-ae69-2c70f66d5c2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_8a0f8253-b81e-4279-b4a7-da7a9d8e6b6b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a14463cc-a2ec-4f1e-9aae-ae98fe062fa4" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_8a0f8253-b81e-4279-b4a7-da7a9d8e6b6b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_753c4bc1-aee1-495e-9aa6-91aeb608f7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a14463cc-a2ec-4f1e-9aae-ae98fe062fa4" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_753c4bc1-aee1-495e-9aa6-91aeb608f7ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_dc192994-0ff3-4818-a618-0c33e90659b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a14463cc-a2ec-4f1e-9aae-ae98fe062fa4" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_dc192994-0ff3-4818-a618-0c33e90659b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="swx-20210930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_b7f93a1e-087e-4fe1-abab-c3dc82b9c25c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_8420141e-d819-4994-92ee-ee2ce99a6769" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_b7f93a1e-087e-4fe1-abab-c3dc82b9c25c" xlink:to="loc_us-gaap_StatementTable_8420141e-d819-4994-92ee-ee2ce99a6769" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_3c914bad-f079-4faf-8378-9c2a60c19f94" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_8420141e-d819-4994-92ee-ee2ce99a6769" xlink:to="loc_dei_LegalEntityAxis_3c914bad-f079-4faf-8378-9c2a60c19f94" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_70db7919-f854-425b-bea7-d9760c9b6b4a" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_3c914bad-f079-4faf-8378-9c2a60c19f94" xlink:to="loc_dei_EntityDomain_70db7919-f854-425b-bea7-d9760c9b6b4a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_de015a15-8664-4a33-b509-59a2daa197ab" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_70db7919-f854-425b-bea7-d9760c9b6b4a" xlink:to="loc_swx_SouthwestGasCorporationMember_de015a15-8664-4a33-b509-59a2daa197ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_8420141e-d819-4994-92ee-ee2ce99a6769" xlink:to="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_e0a7026f-65ea-4eab-a7dc-eae552096260" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_e0a7026f-65ea-4eab-a7dc-eae552096260" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_2247be20-cb3e-4cba-9f7a-cabb920dba4b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_e0a7026f-65ea-4eab-a7dc-eae552096260" xlink:to="loc_us-gaap_ProfitLoss_2247be20-cb3e-4cba-9f7a-cabb920dba4b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_e0a7026f-65ea-4eab-a7dc-eae552096260" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_0d002f84-5d52-4b92-b35f-9da7c2a8d5fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_DepreciationAndAmortization_0d002f84-5d52-4b92-b35f-9da7c2a8d5fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_30d1a24a-15f7-458e-9a07-f24e99109bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredIncomeTaxes"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_30d1a24a-15f7-458e-9a07-f24e99109bd3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_e5bb20d7-f5cb-49c9-aceb-a6e8564b048b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_e5bb20d7-f5cb-49c9-aceb-a6e8564b048b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_5e2ad943-97a7-4603-ab18-936096a0c7f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_5e2ad943-97a7-4603-ab18-936096a0c7f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredGasCost_c7a1b058-3e3e-4cc7-addb-6ee166d07943" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredGasCost"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredGasCost_c7a1b058-3e3e-4cc7-addb-6ee166d07943" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_93a3e41b-6102-4cdb-83e7-a585088af684" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_93a3e41b-6102-4cdb-83e7-a585088af684" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_b233ad67-411f-4081-a5bf-4181b7de8581" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedTaxesPayable"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_b233ad67-411f-4081-a5bf-4181b7de8581" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet_761b3fce-477c-4fc3-9c5d-26a4ba0fc002" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2eb8e040-94c4-4892-a36b-c3118012b27e" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet_761b3fce-477c-4fc3-9c5d-26a4ba0fc002" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_979209a1-19fb-4171-878a-07725637ef59" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_979209a1-19fb-4171-878a-07725637ef59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_5f48ae87-898a-4c03-ac71-609b67c69aaf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_ShareBasedCompensation_5f48ae87-898a-4c03-ac71-609b67c69aaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction_ec3040b6-d78f-4454-a064-5aa7b58ffe41" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction_ec3040b6-d78f-4454-a064-5aa7b58ffe41" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_247ea376-223b-4de6-b640-c02acd3d373f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_247ea376-223b-4de6-b640-c02acd3d373f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_9b2f21cc-88b7-40a8-8772-a60f2a24d117" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_9b2f21cc-88b7-40a8-8772-a60f2a24d117" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_86eb7c84-7a9d-41ce-ab8c-77a0fe9287ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_af10877b-d69a-4496-83d0-e4120cbc24b2" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_86eb7c84-7a9d-41ce-ab8c-77a0fe9287ce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4b368b86-1f5f-4356-85fb-a8e359bd988c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4b368b86-1f5f-4356-85fb-a8e359bd988c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_64dd44f8-84fe-4dd9-aec5-5e121cd33714" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4b368b86-1f5f-4356-85fb-a8e359bd988c" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_64dd44f8-84fe-4dd9-aec5-5e121cd33714" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_5658d99e-4401-464f-b70f-8486e9f13404" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4b368b86-1f5f-4356-85fb-a8e359bd988c" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_5658d99e-4401-464f-b70f-8486e9f13404" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ChangesInCustomerAdvancesInvestingActivities_227e73f0-2a61-4351-ab17-50c3af1fc0c7" xlink:href="swx-20210930.xsd#swx_ChangesInCustomerAdvancesInvestingActivities"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4b368b86-1f5f-4356-85fb-a8e359bd988c" xlink:to="loc_swx_ChangesInCustomerAdvancesInvestingActivities_227e73f0-2a61-4351-ab17-50c3af1fc0c7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_38b6978a-7178-4b04-bad7-abc562b2ee2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4b368b86-1f5f-4356-85fb-a8e359bd988c" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_38b6978a-7178-4b04-bad7-abc562b2ee2d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_e7bff96f-70b5-4348-b6da-3aa054d91b55" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4b368b86-1f5f-4356-85fb-a8e359bd988c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_e7bff96f-70b5-4348-b6da-3aa054d91b55" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_efdbf028-97ba-433b-beb0-c1dcf15f6db0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_efdbf028-97ba-433b-beb0-c1dcf15f6db0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromContributionsFromParent_aea99094-b1ec-40a3-966c-3d9a1f3b59b3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromContributionsFromParent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_ProceedsFromContributionsFromParent_aea99094-b1ec-40a3-966c-3d9a1f3b59b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_808b6746-1c0c-4aba-9f05-9b01abfd4d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_808b6746-1c0c-4aba-9f05-9b01abfd4d5c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_d3b2062a-2563-4a4d-8d18-e5432a4bc0cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_d3b2062a-2563-4a4d-8d18-e5432a4bc0cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_1c6648e8-4710-46f5-9bdd-30f17c094ac3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_1c6648e8-4710-46f5-9bdd-30f17c094ac3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper_cf7b9e9a-f94f-4446-92af-81a93621e834" xlink:href="swx-20210930.xsd#swx_ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_swx_ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper_cf7b9e9a-f94f-4446-92af-81a93621e834" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_bf90d1ac-b014-47b3-b6c5-48b3b454d492" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_bf90d1ac-b014-47b3-b6c5-48b3b454d492" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_25e94cb2-c246-4b17-ba88-cf0c9846455f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_25e94cb2-c246-4b17-ba88-cf0c9846455f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_8ff3b308-beeb-4bcf-8b9c-2f1339510001" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_8ff3b308-beeb-4bcf-8b9c-2f1339510001" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9f664ff0-69bc-4b9f-ab60-bfeb9a652e87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6429afc5-ef1b-465c-ae5b-3f4e527a1d97" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9f664ff0-69bc-4b9f-ab60-bfeb9a652e87" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a5fc298d-85aa-40ed-8e7e-0456e235eb23" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a5fc298d-85aa-40ed-8e7e-0456e235eb23" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_742545ef-3080-428b-8be0-e16e7a9f1bae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_742545ef-3080-428b-8be0-e16e7a9f1bae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_aaa4848a-3c14-4d83-8fdc-fd0acd6852ca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_aaa4848a-3c14-4d83-8fdc-fd0acd6852ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a31dc089-6115-4b1c-afde-8c463a29f666" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a31dc089-6115-4b1c-afde-8c463a29f666" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_58551d4e-458d-4354-98ba-a3a5e903e2b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_7615a36b-7ef2-410d-bd63-9b63fde41325" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_58551d4e-458d-4354-98ba-a3a5e903e2b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_10050d1c-c780-46b4-93f0-ac87ba0a3960" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPaidNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_58551d4e-458d-4354-98ba-a3a5e903e2b6" xlink:to="loc_us-gaap_InterestPaidNet_10050d1c-c780-46b4-93f0-ac87ba0a3960" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_cb91274b-3ef1-4a3d-954e-187cbf5124ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_58551d4e-458d-4354-98ba-a3a5e903e2b6" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_cb91274b-3ef1-4a3d-954e-187cbf5124ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="swx-20210930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_270fb7e3-4646-4818-b4c7-e8f9e05fa6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_7e3e439c-45de-4568-bfa0-07f231f8c83a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_270fb7e3-4646-4818-b4c7-e8f9e05fa6b9" xlink:to="loc_us-gaap_StatementTable_7e3e439c-45de-4568-bfa0-07f231f8c83a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_037a9dc1-b0cc-49a8-adc7-a378ee6b6b9c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_7e3e439c-45de-4568-bfa0-07f231f8c83a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_037a9dc1-b0cc-49a8-adc7-a378ee6b6b9c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_53597575-d496-4586-adda-2344c38ba5ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_037a9dc1-b0cc-49a8-adc7-a378ee6b6b9c" xlink:to="loc_us-gaap_EquityComponentDomain_53597575-d496-4586-adda-2344c38ba5ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_32c3f56b-3cc1-4ced-bc78-f9fb652e3e63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_53597575-d496-4586-adda-2344c38ba5ab" xlink:to="loc_us-gaap_CommonStockMember_32c3f56b-3cc1-4ced-bc78-f9fb652e3e63" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_5fcb9c07-ac1d-45a8-a71a-92fae64a7162" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_53597575-d496-4586-adda-2344c38ba5ab" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_5fcb9c07-ac1d-45a8-a71a-92fae64a7162" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_41a24fca-03e9-4837-9d5b-69ce07c5606c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_53597575-d496-4586-adda-2344c38ba5ab" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_41a24fca-03e9-4837-9d5b-69ce07c5606c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_fc250b12-e4b7-43eb-abfa-9e5e12e82647" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_53597575-d496-4586-adda-2344c38ba5ab" xlink:to="loc_us-gaap_RetainedEarningsMember_fc250b12-e4b7-43eb-abfa-9e5e12e82647" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_081c5504-f09c-4348-a6ae-bfbc350f078b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ParentMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_53597575-d496-4586-adda-2344c38ba5ab" xlink:to="loc_us-gaap_ParentMember_081c5504-f09c-4348-a6ae-bfbc350f078b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_60677097-464b-44d8-b36e-e3f49e914207" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_7e3e439c-45de-4568-bfa0-07f231f8c83a" xlink:to="loc_dei_LegalEntityAxis_60677097-464b-44d8-b36e-e3f49e914207" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a34da7ba-2d73-40d3-a9a4-d72149ccb9b1" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_60677097-464b-44d8-b36e-e3f49e914207" xlink:to="loc_dei_EntityDomain_a34da7ba-2d73-40d3-a9a4-d72149ccb9b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_52a8e22a-1537-4783-a72d-5977a33a1b9c" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_a34da7ba-2d73-40d3-a9a4-d72149ccb9b1" xlink:to="loc_swx_SouthwestGasCorporationMember_52a8e22a-1537-4783-a72d-5977a33a1b9c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_c2c242e8-6151-4796-973c-35dd1291758b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_7e3e439c-45de-4568-bfa0-07f231f8c83a" xlink:to="loc_us-gaap_StatementLineItems_c2c242e8-6151-4796-973c-35dd1291758b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_c2c242e8-6151-4796-973c-35dd1291758b" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_3809e892-ddee-4ba3-8572-b5a88592643e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_3809e892-ddee-4ba3-8572-b5a88592643e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_884b8b69-b143-4d4b-9726-5e1ebce6f3f0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_884b8b69-b143-4d4b-9726-5e1ebce6f3f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_3a81b89f-71bb-4b02-a384-fc99501ec19a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_3a81b89f-71bb-4b02-a384-fc99501ec19a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_4e69bea2-9b1f-4789-9447-de60ed78ecc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_4e69bea2-9b1f-4789-9447-de60ed78ecc0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent_bed22f70-da13-40c4-a351-92084a39c3e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent_bed22f70-da13-40c4-a351-92084a39c3e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTaxOther_c7fd9215-5e6e-4706-b384-91df5059a29a" xlink:href="swx-20210930.xsd#swx_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTaxOther"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_swx_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTaxOther_c7fd9215-5e6e-4706-b384-91df5059a29a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_82109726-de45-4a43-8100-0f134a97543e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_82109726-de45-4a43-8100-0f134a97543e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_4f9a8af2-8704-458d-a367-3c8f98e1ab6c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_4f9a8af2-8704-458d-a367-3c8f98e1ab6c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_a2bc6bef-a192-4fce-8459-704b2c581695" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_a2bc6bef-a192-4fce-8459-704b2c581695" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AdjustmentsToAdditionalPaidInCapitalContributionsFromParent_708b447a-fd5e-4ceb-bc62-b956afd076f9" xlink:href="swx-20210930.xsd#swx_AdjustmentsToAdditionalPaidInCapitalContributionsFromParent"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_swx_AdjustmentsToAdditionalPaidInCapitalContributionsFromParent_708b447a-fd5e-4ceb-bc62-b956afd076f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_72427a57-91aa-4ea5-bdf3-500b18b7162d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsCommonStock"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_DividendsCommonStock_72427a57-91aa-4ea5-bdf3-500b18b7162d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestChangeInRedemptionValue_43541fe4-a636-4227-8c2d-46ccd7b697f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterestChangeInRedemptionValue"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_MinorityInterestChangeInRedemptionValue_43541fe4-a636-4227-8c2d-46ccd7b697f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_5a5d41fd-a26c-4b05-9239-b93ae735a05c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_5a5d41fd-a26c-4b05-9239-b93ae735a05c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_69f60b69-f6cb-4d8d-958c-0b77e43240c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_850fbf16-1ca2-4421-b293-b0801bb35905" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_69f60b69-f6cb-4d8d-958c-0b77e43240c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_f0b5d119-cd7c-4549-905a-c23998c42630" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_c2c242e8-6151-4796-973c-35dd1291758b" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_f0b5d119-cd7c-4549-905a-c23998c42630" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPolicies" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPolicies"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_be08ef6d-8b39-47f9-bd74-5d05e263082e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock_2af4abc6-b1c2-4a82-ad11-3451f2f7e53a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_be08ef6d-8b39-47f9-bd74-5d05e263082e" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock_2af4abc6-b1c2-4a82-ad11-3451f2f7e53a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesPolicies"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_NatureOfOperationsPolicyTextBlock_cc07f2c5-8694-4510-ad44-b3359e4199f2" xlink:href="swx-20210930.xsd#swx_NatureOfOperationsPolicyTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_swx_NatureOfOperationsPolicyTextBlock_cc07f2c5-8694-4510-ad44-b3359e4199f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_c276b238-5ed3-4ed5-9b88-aeabf9a4e54a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_c276b238-5ed3-4ed5-9b88-aeabf9a4e54a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_5dec852a-39b5-4982-ab3c-881404e4f62b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementPolicyPolicyTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_5dec852a-39b5-4982-ab3c-881404e4f62b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_6eb95295-0953-4e55-b89e-8bf729f5a0ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_6eb95295-0953-4e55-b89e-8bf729f5a0ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntercompanyProfitToRegulatedAffiliatesPolicy_63a61124-2c25-4a1d-ba87-5ad35701a89e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntercompanyProfitToRegulatedAffiliatesPolicy"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_IntercompanyProfitToRegulatedAffiliatesPolicy_63a61124-2c25-4a1d-ba87-5ad35701a89e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_8207c30e-dcd6-4c57-9ab2-fee8c417f834" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_8207c30e-dcd6-4c57-9ab2-fee8c417f834" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DeferredPurchasedCostsPolicyTextBlock_87d67319-6853-474d-8a4b-a1396881158c" xlink:href="swx-20210930.xsd#swx_DeferredPurchasedCostsPolicyTextBlock"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_swx_DeferredPurchasedCostsPolicyTextBlock_87d67319-6853-474d-8a4b-a1396881158c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_PrepaidAndOtherCurrentAssetsPolicyPolicyTextBlock_fea7dc65-438f-4d59-ac2b-ac5a82837d6d" xlink:href="swx-20210930.xsd#swx_PrepaidAndOtherCurrentAssetsPolicyPolicyTextBlock"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_swx_PrepaidAndOtherCurrentAssetsPolicyPolicyTextBlock_fea7dc65-438f-4d59-ac2b-ac5a82837d6d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_d5cbe483-94a6-410e-a0fd-cd40f2f91890" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_d5cbe483-94a6-410e-a0fd-cd40f2f91890" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherCurrentLiabilitiesPolicyPolicyTextBlock_235ad50d-040a-4f0e-96b6-e597eec974c2" xlink:href="swx-20210930.xsd#swx_OtherCurrentLiabilitiesPolicyPolicyTextBlock"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_swx_OtherCurrentLiabilitiesPolicyPolicyTextBlock_235ad50d-040a-4f0e-96b6-e597eec974c2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_6ad7d4d5-e8dc-4e0c-b5bd-2cdd54214c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_EarningsPerSharePolicyTextBlock_6ad7d4d5-e8dc-4e0c-b5bd-2cdd54214c4b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_ac8aafc5-b9d4-4bfd-8c25-a23d777ac4d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_c693abac-f0d9-47a8-a458-ba003d3a9cb6" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_ac8aafc5-b9d4-4bfd-8c25-a23d777ac4d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesTables" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_b76a9b46-36c1-4560-a672-e73965d50fe2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTableTextBlock_b118b5b5-b0a3-4266-bd4c-ea9c3ec18785" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_b76a9b46-36c1-4560-a672-e73965d50fe2" xlink:to="loc_us-gaap_InvestmentTableTextBlock_b118b5b5-b0a3-4266-bd4c-ea9c3ec18785" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTextBlock_e9ef5315-a12a-488f-9f2b-39be9c3e4791" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_b76a9b46-36c1-4560-a672-e73965d50fe2" xlink:to="loc_us-gaap_ScheduleOfGoodwillTextBlock_e9ef5315-a12a-488f-9f2b-39be9c3e4791" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOtherNonoperatingIncomeByComponentTextBlock_73f5c27c-81d3-42b6-9a25-85b6f3e539eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfOtherNonoperatingIncomeByComponentTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_b76a9b46-36c1-4560-a672-e73965d50fe2" xlink:to="loc_us-gaap_ScheduleOfOtherNonoperatingIncomeByComponentTextBlock_73f5c27c-81d3-42b6-9a25-85b6f3e539eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestTableTextBlock_b0938f0d-041c-4212-b5d7-28a65b845a5b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestTableTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_b76a9b46-36c1-4560-a672-e73965d50fe2" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestTableTextBlock_b0938f0d-041c-4212-b5d7-28a65b845a5b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_41fd8305-8adf-4a83-a7e9-1885bd23915d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_b76a9b46-36c1-4560-a672-e73965d50fe2" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_41fd8305-8adf-4a83-a7e9-1885bd23915d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesNarrativesDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesNarrativesDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesNarrativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_9c9cde87-8ee5-40ba-82d4-2127e36482c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:href="swx-20210930.xsd#swx_SignificantAccountingPoliciesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_9c9cde87-8ee5-40ba-82d4-2127e36482c8" xlink:to="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_1ea6a6cf-8ea3-49cd-8517-7b616b5e1187" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_dei_LegalEntityAxis_1ea6a6cf-8ea3-49cd-8517-7b616b5e1187" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_423fca7c-bc0e-4aab-bd8e-6f0e5d50c05c" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_1ea6a6cf-8ea3-49cd-8517-7b616b5e1187" xlink:to="loc_dei_EntityDomain_423fca7c-bc0e-4aab-bd8e-6f0e5d50c05c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_875d5195-d33b-4c73-a26e-dfbb3ce6cfe0" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_423fca7c-bc0e-4aab-bd8e-6f0e5d50c05c" xlink:to="loc_swx_SouthwestGasCorporationMember_875d5195-d33b-4c73-a26e-dfbb3ce6cfe0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryAxis_d659f1e6-d520-42bd-a311-57ed049555f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PublicUtilitiesInventoryAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_us-gaap_PublicUtilitiesInventoryAxis_d659f1e6-d520-42bd-a311-57ed049555f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_be68f207-a114-415b-81a8-033b7acae229" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PublicUtilitiesInventoryTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PublicUtilitiesInventoryAxis_d659f1e6-d520-42bd-a311-57ed049555f8" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_be68f207-a114-415b-81a8-033b7acae229" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_GasPipeInventoryAndOperatingSuppliesMember_6c42f4ed-a735-482a-b854-244e6b8480d9" xlink:href="swx-20210930.xsd#swx_GasPipeInventoryAndOperatingSuppliesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_be68f207-a114-415b-81a8-033b7acae229" xlink:to="loc_swx_GasPipeInventoryAndOperatingSuppliesMember_6c42f4ed-a735-482a-b854-244e6b8480d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_6edc000e-5f7f-44e9-956e-fc0a9109af4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_6edc000e-5f7f-44e9-956e-fc0a9109af4a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_495f4fbb-18fc-457f-894b-52a840852522" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6edc000e-5f7f-44e9-956e-fc0a9109af4a" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_495f4fbb-18fc-457f-894b-52a840852522" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_922dac2d-2464-4987-b32d-65bdfef6586c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_495f4fbb-18fc-457f-894b-52a840852522" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_922dac2d-2464-4987-b32d-65bdfef6586c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_122fd7dc-6037-4ee0-a05b-6c1fbf8e59aa" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_OwnershipAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_srt_OwnershipAxis_122fd7dc-6037-4ee0-a05b-6c1fbf8e59aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_947f62f6-fb00-4416-bda1-f5658c0a1efd" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_OwnershipDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_OwnershipAxis_122fd7dc-6037-4ee0-a05b-6c1fbf8e59aa" xlink:to="loc_srt_OwnershipDomain_947f62f6-fb00-4416-bda1-f5658c0a1efd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LinetecServicesLLCMember_4e2f6011-e058-470a-96ed-19138d799497" xlink:href="swx-20210930.xsd#swx_LinetecServicesLLCMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_OwnershipDomain_947f62f6-fb00-4416-bda1-f5658c0a1efd" xlink:to="loc_swx_LinetecServicesLLCMember_4e2f6011-e058-470a-96ed-19138d799497" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_0cb22bb3-74ce-4a52-bec4-4b600861299c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_us-gaap_DebtInstrumentAxis_0cb22bb3-74ce-4a52-bec4-4b600861299c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_026d24ec-804f-46cc-9bdf-a0023b6d5333" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_0cb22bb3-74ce-4a52-bec4-4b600861299c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_026d24ec-804f-46cc-9bdf-a0023b6d5333" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_A250MillionTermLoanMember_0a275216-0831-401e-b27d-3b8c1996d17a" xlink:href="swx-20210930.xsd#swx_A250MillionTermLoanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_026d24ec-804f-46cc-9bdf-a0023b6d5333" xlink:to="loc_swx_A250MillionTermLoanMember_0a275216-0831-401e-b27d-3b8c1996d17a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_3624e494-6a61-4472-9896-e75fd363e899" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_3624e494-6a61-4472-9896-e75fd363e899" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_63bd53f8-2f19-4fad-a10d-c31a140d74ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_3624e494-6a61-4472-9896-e75fd363e899" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_63bd53f8-2f19-4fad-a10d-c31a140d74ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_34a8c4f6-f382-454e-baf6-0dc33909d3f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_63bd53f8-2f19-4fad-a10d-c31a140d74ee" xlink:to="loc_us-gaap_SubsequentEventMember_34a8c4f6-f382-454e-baf6-0dc33909d3f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_368b5599-bb71-41eb-91b9-73ba25dff0e3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_368b5599-bb71-41eb-91b9-73ba25dff0e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_fa028294-b692-46c2-a802-607695c2b2b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_368b5599-bb71-41eb-91b9-73ba25dff0e3" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_fa028294-b692-46c2-a802-607695c2b2b0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_c611685c-fdbb-4c83-af5d-bd9a49c77713" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_fa028294-b692-46c2-a802-607695c2b2b0" xlink:to="loc_us-gaap_MoneyMarketFundsMember_c611685c-fdbb-4c83-af5d-bd9a49c77713" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_87cdc05d-6c2c-4e4a-98a0-6312630b8b72" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_87cdc05d-6c2c-4e4a-98a0-6312630b8b72" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4f14fe8b-1519-42fb-9e7e-3b0bb2b37d95" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_87cdc05d-6c2c-4e4a-98a0-6312630b8b72" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4f14fe8b-1519-42fb-9e7e-3b0bb2b37d95" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_QuestarPipelinesMember_c94dbbec-59d1-4e75-a84c-e62e0ee142d7" xlink:href="swx-20210930.xsd#swx_QuestarPipelinesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4f14fe8b-1519-42fb-9e7e-3b0bb2b37d95" xlink:to="loc_swx_QuestarPipelinesMember_c94dbbec-59d1-4e75-a84c-e62e0ee142d7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:href="swx-20210930.xsd#swx_SignificantAccountingPoliciesLineItems"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesTable_12076b04-e92e-4331-b797-d4145905b65e" xlink:to="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_05cf1cf1-079a-432e-8a98-126bb6b67e73" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_05cf1cf1-079a-432e-8a98-126bb6b67e73" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_3b5e3681-c3ef-4507-9840-5f37ff4e6542" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_3b5e3681-c3ef-4507-9840-5f37ff4e6542" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_19567b8c-a5dc-4e40-b58e-994318def426" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_19567b8c-a5dc-4e40-b58e-994318def426" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfStatesInWhichEntityOperates_643c8ff4-f992-418b-b7f6-9658ab12e9b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfStatesInWhichEntityOperates"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_NumberOfStatesInWhichEntityOperates_643c8ff4-f992-418b-b7f6-9658ab12e9b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AccountsReceivableExtendingPeriod_2b152949-97f9-4717-8b89-8ada0be0b923" xlink:href="swx-20210930.xsd#swx_AccountsReceivableExtendingPeriod"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_AccountsReceivableExtendingPeriod_2b152949-97f9-4717-8b89-8ada0be0b923" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DeferredPurchasedGasCostsRecoveredOrRefundedPeriod_a8a5e948-a4b3-4af6-a164-a059bf32565e" xlink:href="swx-20210930.xsd#swx_DeferredPurchasedGasCostsRecoveredOrRefundedPeriod"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_DeferredPurchasedGasCostsRecoveredOrRefundedPeriod_a8a5e948-a4b3-4af6-a164-a059bf32565e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DeferredPurchasedGasCostsEstimatedIncrementalCosts_7de67dd5-415b-4d6c-b141-d6bdc5c93959" xlink:href="swx-20210930.xsd#swx_DeferredPurchasedGasCostsEstimatedIncrementalCosts"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_DeferredPurchasedGasCostsEstimatedIncrementalCosts_7de67dd5-415b-4d6c-b141-d6bdc5c93959" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_1fc6f949-dae5-43fa-a6f1-1b9a786f0170" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_DebtInstrumentTerm_1fc6f949-dae5-43fa-a6f1-1b9a786f0170" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_bb4537a8-2264-479e-8101-aea62f1825e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_bb4537a8-2264-479e-8101-aea62f1825e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DeferredPurchasedGasCostsPipelineImbalanceCharges_2c35ac56-5726-4fd9-b939-453633aa8306" xlink:href="swx-20210930.xsd#swx_DeferredPurchasedGasCostsPipelineImbalanceCharges"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_DeferredPurchasedGasCostsPipelineImbalanceCharges_2c35ac56-5726-4fd9-b939-453633aa8306" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialsSuppliesAndOther_52fd52d3-2ab2-4234-94f4-edcdf04b98a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MaterialsSuppliesAndOther"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_MaterialsSuppliesAndOther_52fd52d3-2ab2-4234-94f4-edcdf04b98a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ReclassificationAmountFromNetUtilityPlantToPrepaidAndOtherCurrentAssetsDuringPeriod_d6d36049-a8ce-474a-9450-d774575b7a6d" xlink:href="swx-20210930.xsd#swx_ReclassificationAmountFromNetUtilityPlantToPrepaidAndOtherCurrentAssetsDuringPeriod"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_ReclassificationAmountFromNetUtilityPlantToPrepaidAndOtherCurrentAssetsDuringPeriod_d6d36049-a8ce-474a-9450-d774575b7a6d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_b867e68e-1356-42c1-a009-b464e6231641" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_b867e68e-1356-42c1-a009-b464e6231641" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrent_0c1dd0f0-618a-4e60-98a5-1ee487cbaecc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsPayableCurrent"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_DividendsPayableCurrent_0c1dd0f0-618a-4e60-98a5-1ee487cbaecc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_0ef85647-b0a0-4413-a0f8-28dcbed28c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_0ef85647-b0a0-4413-a0f8-28dcbed28c4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LossContingencySelfInsuredRetentionAmount_b269b04a-3224-4111-8edb-367bdb95e743" xlink:href="swx-20210930.xsd#swx_LossContingencySelfInsuredRetentionAmount"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_LossContingencySelfInsuredRetentionAmount_b269b04a-3224-4111-8edb-367bdb95e743" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LossContingencyThresholdAmountAboveSelfInsuredRetention_3b847cc7-c15a-4ef3-8c66-631dff20d78e" xlink:href="swx-20210930.xsd#swx_LossContingencyThresholdAmountAboveSelfInsuredRetention"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_LossContingencyThresholdAmountAboveSelfInsuredRetention_3b847cc7-c15a-4ef3-8c66-631dff20d78e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LossContingencyMaximumExposure_536a9ad7-0d3d-42d5-8c42-1ec40ab94ce8" xlink:href="swx-20210930.xsd#swx_LossContingencyMaximumExposure"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_swx_LossContingencyMaximumExposure_536a9ad7-0d3d-42d5-8c42-1ec40ab94ce8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_4c6d30d7-92b0-4819-ae65-ac77300942b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_SignificantAccountingPoliciesLineItems_79461660-8423-4b54-8a58-d6dd389ac882" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_4c6d30d7-92b0-4819-ae65-ac77300942b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofOtherPropertyandInvestmentsDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofOtherPropertyandInvestmentsDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofOtherPropertyandInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_1913cbd3-8e39-41bb-a131-e32a715cb3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_ba486732-dbd4-4e4e-9ad7-1d0b5ab3e858" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_1913cbd3-8e39-41bb-a131-e32a715cb3e9" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_ba486732-dbd4-4e4e-9ad7-1d0b5ab3e858" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_4e850b4d-2ee8-430c-bf7c-1407b8a1fdf4" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_ba486732-dbd4-4e4e-9ad7-1d0b5ab3e858" xlink:to="loc_dei_LegalEntityAxis_4e850b4d-2ee8-430c-bf7c-1407b8a1fdf4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6f9f6c5f-2bd9-4a39-9130-14b1699da4f2" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_4e850b4d-2ee8-430c-bf7c-1407b8a1fdf4" xlink:to="loc_dei_EntityDomain_6f9f6c5f-2bd9-4a39-9130-14b1699da4f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_ea1c7de6-3dd3-45d9-b62a-95d4d2bf5954" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_6f9f6c5f-2bd9-4a39-9130-14b1699da4f2" xlink:to="loc_swx_SouthwestGasCorporationMember_ea1c7de6-3dd3-45d9-b62a-95d4d2bf5954" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_23445082-b43c-4006-9671-b3f875c40254" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_6f9f6c5f-2bd9-4a39-9130-14b1699da4f2" xlink:to="loc_swx_CenturiGroupInc.Member_23445082-b43c-4006-9671-b3f875c40254" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eeeed5c7-3d5b-40b2-8512-8c1d6e6bcc93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_ba486732-dbd4-4e4e-9ad7-1d0b5ab3e858" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eeeed5c7-3d5b-40b2-8512-8c1d6e6bcc93" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueOfLifeInsurance_57746bb4-b03a-459c-83be-80c63cf2aa19" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashSurrenderValueOfLifeInsurance"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eeeed5c7-3d5b-40b2-8512-8c1d6e6bcc93" xlink:to="loc_us-gaap_CashSurrenderValueOfLifeInsurance_57746bb4-b03a-459c-83be-80c63cf2aa19" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherNet_66690ce7-77d3-4637-a61d-19e6b46c0b27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eeeed5c7-3d5b-40b2-8512-8c1d6e6bcc93" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOtherNet_66690ce7-77d3-4637-a61d-19e6b46c0b27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherPropertyAndInvestments_66313c58-26d9-44a8-8af8-9713a8b659d2" xlink:href="swx-20210930.xsd#swx_OtherPropertyAndInvestments"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eeeed5c7-3d5b-40b2-8512-8c1d6e6bcc93" xlink:to="loc_swx_OtherPropertyAndInvestments_66313c58-26d9-44a8-8af8-9713a8b659d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_PropertyPlantEquipmentAndIntangibleAssetsGross_3548be98-65e1-498c-b028-48e1d819bf33" xlink:href="swx-20210930.xsd#swx_PropertyPlantEquipmentAndIntangibleAssetsGross"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eeeed5c7-3d5b-40b2-8512-8c1d6e6bcc93" xlink:to="loc_swx_PropertyPlantEquipmentAndIntangibleAssetsGross_3548be98-65e1-498c-b028-48e1d819bf33" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_721e0fb7-1158-4db3-ba86-ec0c9de4c3a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eeeed5c7-3d5b-40b2-8512-8c1d6e6bcc93" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_721e0fb7-1158-4db3-ba86-ec0c9de4c3a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofGoodwillDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofGoodwillDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_be136ce0-686a-41b2-940f-72a1dea7c746" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_5dcb883e-3733-4ec7-9194-65e4cb4f9625" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_be136ce0-686a-41b2-940f-72a1dea7c746" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_5dcb883e-3733-4ec7-9194-65e4cb4f9625" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_608a96f4-69ca-4aff-8b4f-4f8f79fa59f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_5dcb883e-3733-4ec7-9194-65e4cb4f9625" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_608a96f4-69ca-4aff-8b4f-4f8f79fa59f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_29e17da9-7a2b-44d5-8937-8ee95444519c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_608a96f4-69ca-4aff-8b4f-4f8f79fa59f8" xlink:to="loc_us-gaap_SegmentDomain_29e17da9-7a2b-44d5-8937-8ee95444519c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_NaturalGasOperationsMember_aca9342b-da5c-4255-b460-4310e615c668" xlink:href="swx-20210930.xsd#swx_NaturalGasOperationsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_29e17da9-7a2b-44d5-8937-8ee95444519c" xlink:to="loc_swx_NaturalGasOperationsMember_aca9342b-da5c-4255-b460-4310e615c668" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_UtilityInfrastructureServicesSegmentMember_c1360ad6-2e64-40f3-998f-beaaa306bc0c" xlink:href="swx-20210930.xsd#swx_UtilityInfrastructureServicesSegmentMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_29e17da9-7a2b-44d5-8937-8ee95444519c" xlink:to="loc_swx_UtilityInfrastructureServicesSegmentMember_c1360ad6-2e64-40f3-998f-beaaa306bc0c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_48f60d34-62ed-4078-8049-9ecbffdd2189" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_5dcb883e-3733-4ec7-9194-65e4cb4f9625" xlink:to="loc_us-gaap_GoodwillLineItems_48f60d34-62ed-4078-8049-9ecbffdd2189" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_470197cb-7b74-4c9f-8375-45b3247c2e71" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillLineItems_48f60d34-62ed-4078-8049-9ecbffdd2189" xlink:to="loc_us-gaap_GoodwillRollForward_470197cb-7b74-4c9f-8375-45b3247c2e71" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_68e7a921-8d0d-469e-9a5c-b60d29b4f389" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_470197cb-7b74-4c9f-8375-45b3247c2e71" xlink:to="loc_us-gaap_Goodwill_68e7a921-8d0d-469e-9a5c-b60d29b4f389" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_4a4fe918-e39e-4f52-b9c3-e991e0e5bc67" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_470197cb-7b74-4c9f-8375-45b3247c2e71" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_4a4fe918-e39e-4f52-b9c3-e991e0e5bc67" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_704bac15-6627-4819-a600-5c80733fdc7b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_470197cb-7b74-4c9f-8375-45b3247c2e71" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_704bac15-6627-4819-a600-5c80733fdc7b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_aa321fde-d2aa-42ee-8dfa-c216e855b0be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_470197cb-7b74-4c9f-8375-45b3247c2e71" xlink:to="loc_us-gaap_Goodwill_aa321fde-d2aa-42ee-8dfa-c216e855b0be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesOtherIncomeDeductionsDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesOtherIncomeDeductionsDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesOtherIncomeDeductionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_5d8ac2ec-d32e-4358-9caa-a9322427efbd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedIncomeStatementTable_e418f220-594d-4f97-883a-27420bee22fe" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CondensedIncomeStatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_5d8ac2ec-d32e-4358-9caa-a9322427efbd" xlink:to="loc_srt_CondensedIncomeStatementTable_e418f220-594d-4f97-883a-27420bee22fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_722fd8ca-4e78-48a4-8515-6912031c5d89" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementTable_e418f220-594d-4f97-883a-27420bee22fe" xlink:to="loc_srt_ConsolidationItemsAxis_722fd8ca-4e78-48a4-8515-6912031c5d89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_2287af55-b97d-46a9-ade0-4e634f16f7a9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_722fd8ca-4e78-48a4-8515-6912031c5d89" xlink:to="loc_srt_ConsolidationItemsDomain_2287af55-b97d-46a9-ade0-4e634f16f7a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_65f9f5f8-79ec-493a-b555-a320b4aae575" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_2287af55-b97d-46a9-ade0-4e634f16f7a9" xlink:to="loc_us-gaap_OperatingSegmentsMember_65f9f5f8-79ec-493a-b555-a320b4aae575" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_127beb96-b844-4a85-95d0-4a341375f8d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_2287af55-b97d-46a9-ade0-4e634f16f7a9" xlink:to="loc_us-gaap_CorporateNonSegmentMember_127beb96-b844-4a85-95d0-4a341375f8d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4e79e6de-aa2b-43f1-a32b-bafaaa841303" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementTable_e418f220-594d-4f97-883a-27420bee22fe" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4e79e6de-aa2b-43f1-a32b-bafaaa841303" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_dc607193-1f6f-4cd2-8679-9620ae1be9d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4e79e6de-aa2b-43f1-a32b-bafaaa841303" xlink:to="loc_us-gaap_SegmentDomain_dc607193-1f6f-4cd2-8679-9620ae1be9d7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_NaturalGasOperationsMember_51415052-b266-479d-8bb3-97aaf7148586" xlink:href="swx-20210930.xsd#swx_NaturalGasOperationsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_dc607193-1f6f-4cd2-8679-9620ae1be9d7" xlink:to="loc_swx_NaturalGasOperationsMember_51415052-b266-479d-8bb3-97aaf7148586" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_UtilityInfrastructureServicesSegmentMember_ebef5ad2-e6a4-4c69-8ed6-e1850a2026d9" xlink:href="swx-20210930.xsd#swx_UtilityInfrastructureServicesSegmentMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_dc607193-1f6f-4cd2-8679-9620ae1be9d7" xlink:to="loc_swx_UtilityInfrastructureServicesSegmentMember_ebef5ad2-e6a4-4c69-8ed6-e1850a2026d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5a1366c2-d1d2-47e7-a229-381b6a4e072d" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementTable_e418f220-594d-4f97-883a-27420bee22fe" xlink:to="loc_dei_LegalEntityAxis_5a1366c2-d1d2-47e7-a229-381b6a4e072d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b3d7802f-5176-4137-b3e1-a3b2b319e4e0" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_5a1366c2-d1d2-47e7-a229-381b6a4e072d" xlink:to="loc_dei_EntityDomain_b3d7802f-5176-4137-b3e1-a3b2b319e4e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_2385956f-253e-4776-9738-33c2672ec311" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_b3d7802f-5176-4137-b3e1-a3b2b319e4e0" xlink:to="loc_swx_SouthwestGasCorporationMember_2385956f-253e-4776-9738-33c2672ec311" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_e46a7777-8863-42d1-b140-d1c07e2cd372" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_b3d7802f-5176-4137-b3e1-a3b2b319e4e0" xlink:to="loc_swx_CenturiGroupInc.Member_e46a7777-8863-42d1-b140-d1c07e2cd372" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedIncomeStatementsCaptionsLineItems_c20d4751-9c50-4cb9-97f2-3275d65da352" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CondensedIncomeStatementsCaptionsLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementTable_e418f220-594d-4f97-883a-27420bee22fe" xlink:to="loc_srt_CondensedIncomeStatementsCaptionsLineItems_c20d4751-9c50-4cb9-97f2-3275d65da352" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_c20d4751-9c50-4cb9-97f2-3275d65da352" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue_a0fd7121-550e-4553-8488-90bf398b658d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:to="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue_a0fd7121-550e-4553-8488-90bf398b658d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_39e28817-fdac-4918-bf53-376282910cb0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestIncomeOther"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:to="loc_us-gaap_InterestIncomeOther_39e28817-fdac-4918-bf53-376282910cb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_f9dabfc5-ef4d-4d4d-81a9-f82fefd047f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:to="loc_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_f9dabfc5-ef4d-4d4d-81a9-f82fefd047f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_22577f79-09ba-4578-a9d6-748af79420fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_22577f79-09ba-4578-a9d6-748af79420fa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_68ced362-83c9-44d9-98fe-0fab574f10e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_68ced362-83c9-44d9-98fe-0fab574f10e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_MiscellaneousIncomeExpense_bc4d49fa-df0c-4960-80c6-2491844a9f5f" xlink:href="swx-20210930.xsd#swx_MiscellaneousIncomeExpense"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:to="loc_swx_MiscellaneousIncomeExpense_bc4d49fa-df0c-4960-80c6-2491844a9f5f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_b66d6989-e779-4661-81b3-4ac7c23d6ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_3354cd8b-3bd4-4027-9034-dc8db32a6f68" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_b66d6989-e779-4661-81b3-4ac7c23d6ab7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesSummaryofRedeemableNoncontrollingInterestDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesSummaryofRedeemableNoncontrollingInterestDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesSummaryofRedeemableNoncontrollingInterestDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_e0cd2570-19e4-4334-a7fa-a881bd7505fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_MovementInRedeemableNoncontrollingInterestRollForward_e7a4b4e4-4239-428b-bb55-39656a2f78cb" xlink:href="swx-20210930.xsd#swx_MovementInRedeemableNoncontrollingInterestRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_e0cd2570-19e4-4334-a7fa-a881bd7505fa" xlink:to="loc_swx_MovementInRedeemableNoncontrollingInterestRollForward_e7a4b4e4-4239-428b-bb55-39656a2f78cb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_f9d93d7a-0871-4c12-9f7f-0a5d41895a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_MovementInRedeemableNoncontrollingInterestRollForward_e7a4b4e4-4239-428b-bb55-39656a2f78cb" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_f9d93d7a-0871-4c12-9f7f-0a5d41895a5e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_acc596f0-50c3-4c4f-8549-4e852ebf1333" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_MovementInRedeemableNoncontrollingInterestRollForward_e7a4b4e4-4239-428b-bb55-39656a2f78cb" xlink:to="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_acc596f0-50c3-4c4f-8549-4e852ebf1333" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestChangeInRedemptionValue_3f5afc42-d189-4b7c-821b-e616a7409abc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterestChangeInRedemptionValue"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_MovementInRedeemableNoncontrollingInterestRollForward_e7a4b4e4-4239-428b-bb55-39656a2f78cb" xlink:to="loc_us-gaap_MinorityInterestChangeInRedemptionValue_3f5afc42-d189-4b7c-821b-e616a7409abc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_d56ce231-e43e-41a6-9b2d-c0f71ca0454e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_swx_MovementInRedeemableNoncontrollingInterestRollForward_e7a4b4e4-4239-428b-bb55-39656a2f78cb" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_d56ce231-e43e-41a6-9b2d-c0f71ca0454e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofEarningsPerShareDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofEarningsPerShareDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BackgroundOrganizationandSummaryofSignificantAccountingPoliciesScheduleofEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_497fc598-884d-4398-956c-f583604782b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_20797ced-2b08-4e68-a3b2-32cdddbdbd0c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_497fc598-884d-4398-956c-f583604782b7" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_20797ced-2b08-4e68-a3b2-32cdddbdbd0c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DilutiveSecuritiesAbstract_dc537cc0-fd4c-4feb-9b01-64dfd7f22ff6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DilutiveSecuritiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_497fc598-884d-4398-956c-f583604782b7" xlink:to="loc_us-gaap_DilutiveSecuritiesAbstract_dc537cc0-fd4c-4feb-9b01-64dfd7f22ff6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements_04d820eb-148b-4acb-acd4-bd8844f7f2eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_dc537cc0-fd4c-4feb-9b01-64dfd7f22ff6" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements_04d820eb-148b-4acb-acd4-bd8844f7f2eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends_5c7a0bbe-64ef-4baf-bceb-7d719a67b4ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_dc537cc0-fd4c-4feb-9b01-64dfd7f22ff6" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends_5c7a0bbe-64ef-4baf-bceb-7d719a67b4ff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_71ae8073-2473-4447-a772-5f0d172b1bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_497fc598-884d-4398-956c-f583604782b7" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_71ae8073-2473-4447-a772-5f0d172b1bcd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_NumberOfPerformanceShareUnitsGranted_b2aa5e6e-055d-4788-a6be-d5802d2dfc2b" xlink:href="swx-20210930.xsd#swx_NumberOfPerformanceShareUnitsGranted"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_497fc598-884d-4398-956c-f583604782b7" xlink:to="loc_swx_NumberOfPerformanceShareUnitsGranted_b2aa5e6e-055d-4788-a6be-d5802d2dfc2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/ComponentsofNetPeriodicBenefitCost" xlink:type="simple" xlink:href="swx-20210930.xsd#ComponentsofNetPeriodicBenefitCost"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/ComponentsofNetPeriodicBenefitCost" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_cd7b1b45-96cc-4a9f-9575-39a216039042" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_043b38e5-dbe8-4b3a-8937-6d7d248413de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CompensationAndEmployeeBenefitPlansTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_cd7b1b45-96cc-4a9f-9575-39a216039042" xlink:to="loc_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_043b38e5-dbe8-4b3a-8937-6d7d248413de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/ComponentsofNetPeriodicBenefitCostTables" xlink:type="simple" xlink:href="swx-20210930.xsd#ComponentsofNetPeriodicBenefitCostTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/ComponentsofNetPeriodicBenefitCostTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_e0afe0b2-289b-44b3-a180-eb500c2530ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_c7932c0e-6e71-43c0-9c74-7b4a8219f0b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_e0afe0b2-289b-44b3-a180-eb500c2530ee" xlink:to="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_c7932c0e-6e71-43c0-9c74-7b4a8219f0b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/ComponentsofNetPeriodicBenefitCostDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#ComponentsofNetPeriodicBenefitCostDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/ComponentsofNetPeriodicBenefitCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_2277da02-978f-4995-a685-e7a7f4ca7f77" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0042cba7-dc08-49da-9e17-4a07ce49969c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_2277da02-978f-4995-a685-e7a7f4ca7f77" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0042cba7-dc08-49da-9e17-4a07ce49969c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_f276a487-786d-44ef-8d7a-be8be0e76294" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0042cba7-dc08-49da-9e17-4a07ce49969c" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_f276a487-786d-44ef-8d7a-be8be0e76294" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_147e7fb4-7ef8-476b-aa9f-9ba0f1a0033d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_f276a487-786d-44ef-8d7a-be8be0e76294" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_147e7fb4-7ef8-476b-aa9f-9ba0f1a0033d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_aea7b679-7336-4b88-9fed-5a8dda7b87d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_147e7fb4-7ef8-476b-aa9f-9ba0f1a0033d" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_aea7b679-7336-4b88-9fed-5a8dda7b87d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_97ef8926-f42c-436c-b9f5-37eb3a8cf154" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_147e7fb4-7ef8-476b-aa9f-9ba0f1a0033d" xlink:to="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_97ef8926-f42c-436c-b9f5-37eb3a8cf154" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_c9dcb622-d6ef-4ad0-b730-8a903367cdb1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_147e7fb4-7ef8-476b-aa9f-9ba0f1a0033d" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_c9dcb622-d6ef-4ad0-b730-8a903367cdb1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_a5a31e8f-abfd-4bdb-a14b-ceab1b89ed8b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0042cba7-dc08-49da-9e17-4a07ce49969c" xlink:to="loc_srt_StatementScenarioAxis_a5a31e8f-abfd-4bdb-a14b-ceab1b89ed8b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_02b43ff0-a1e7-47fc-bf97-f845355a17a0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementScenarioAxis_a5a31e8f-abfd-4bdb-a14b-ceab1b89ed8b" xlink:to="loc_srt_ScenarioUnspecifiedDomain_02b43ff0-a1e7-47fc-bf97-f845355a17a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_5e9fb17f-80e0-4851-955b-3849bc933871" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioForecastMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScenarioUnspecifiedDomain_02b43ff0-a1e7-47fc-bf97-f845355a17a0" xlink:to="loc_srt_ScenarioForecastMember_5e9fb17f-80e0-4851-955b-3849bc933871" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0042cba7-dc08-49da-9e17-4a07ce49969c" xlink:to="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_5c4bbd77-2999-400e-9ecb-5b9d5965ec61" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_5c4bbd77-2999-400e-9ecb-5b9d5965ec61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_491f9826-6f85-4759-a22c-1995ce9e7281" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_491f9826-6f85-4759-a22c-1995ce9e7281" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6bccaa51-0368-4702-9b64-d6d29822c283" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6bccaa51-0368-4702-9b64-d6d29822c283" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_8d4d6ce9-7b59-4d19-88f3-e8037c6ba100" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_8d4d6ce9-7b59-4d19-88f3-e8037c6ba100" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_f583c183-0312-49d3-b624-116dd00906ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_f583c183-0312-49d3-b624-116dd00906ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4100ba12-e518-46f8-a4a4-47c5165bd21f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4100ba12-e518-46f8-a4a4-47c5165bd21f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesDeferredAmount_fe7cf342-a439-4399-80f6-7f82aa3cb544" xlink:href="swx-20210930.xsd#swx_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesDeferredAmount"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_swx_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesDeferredAmount_fe7cf342-a439-4399-80f6-7f82aa3cb544" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_8628a48a-5ea8-464c-b1ab-a3e61668387d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_8628a48a-5ea8-464c-b1ab-a3e61668387d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_f7d53962-0dfc-46e9-bbe4-2036f21a0afe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1c96d76b-6780-4c48-8b4c-6ce96b2080c7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_f7d53962-0dfc-46e9-bbe4-2036f21a0afe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/Revenue" xlink:type="simple" xlink:href="swx-20210930.xsd#Revenue"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/Revenue" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_20380bcb-6786-402c-abf6-c9d10fe00d54" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_aa598646-02b2-4948-b4a8-e14005675e4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_20380bcb-6786-402c-abf6-c9d10fe00d54" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_aa598646-02b2-4948-b4a8-e14005675e4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueTables" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_35eb4876-3e55-44dd-bdb6-a81ed0c1b13e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_b37e8ef0-e419-4711-8029-5ba4b3537aa3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_35eb4876-3e55-44dd-bdb6-a81ed0c1b13e" xlink:to="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_b37e8ef0-e419-4711-8029-5ba4b3537aa3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ScheduleOfInformationAboutReceivablesRevenueEarnedOnContractsInProgressInExcessOfBillingsAndAmountsBilledInExcessOfRevenueEarnedOnContractsTableTextBlock_513ff297-749c-47ef-8c14-fa7ccc35a55b" xlink:href="swx-20210930.xsd#swx_ScheduleOfInformationAboutReceivablesRevenueEarnedOnContractsInProgressInExcessOfBillingsAndAmountsBilledInExcessOfRevenueEarnedOnContractsTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_35eb4876-3e55-44dd-bdb6-a81ed0c1b13e" xlink:to="loc_swx_ScheduleOfInformationAboutReceivablesRevenueEarnedOnContractsInProgressInExcessOfBillingsAndAmountsBilledInExcessOfRevenueEarnedOnContractsTableTextBlock_513ff297-749c-47ef-8c14-fa7ccc35a55b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_cba213c2-8d76-4dd9-b29c-d8d4da1287f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_35eb4876-3e55-44dd-bdb6-a81ed0c1b13e" xlink:to="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_cba213c2-8d76-4dd9-b29c-d8d4da1287f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueScheduleofGasOperatingRevenueDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueScheduleofGasOperatingRevenueDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueScheduleofGasOperatingRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_8e77dd12-bb60-4dca-b033-48d497cd4fca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8d1a3827-4d22-409a-ab99-d87ffecb7165" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_8e77dd12-bb60-4dca-b033-48d497cd4fca" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8d1a3827-4d22-409a-ab99-d87ffecb7165" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_a9617c4e-b106-450c-aada-ad6e7583330f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MajorCustomersAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8d1a3827-4d22-409a-ab99-d87ffecb7165" xlink:to="loc_srt_MajorCustomersAxis_a9617c4e-b106-450c-aada-ad6e7583330f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_81291846-f44b-4f04-b6a8-44b7735841a7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_MajorCustomersAxis_a9617c4e-b106-450c-aada-ad6e7583330f" xlink:to="loc_srt_NameOfMajorCustomerDomain_81291846-f44b-4f04-b6a8-44b7735841a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ResidentialMember_f413a9e5-7dec-40b8-af08-16767efe137c" xlink:href="swx-20210930.xsd#swx_ResidentialMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_NameOfMajorCustomerDomain_81291846-f44b-4f04-b6a8-44b7735841a7" xlink:to="loc_swx_ResidentialMember_f413a9e5-7dec-40b8-af08-16767efe137c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SmallCommercialMember_2c2baee3-cfab-4b20-97bb-bafc225ac203" xlink:href="swx-20210930.xsd#swx_SmallCommercialMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_NameOfMajorCustomerDomain_81291846-f44b-4f04-b6a8-44b7735841a7" xlink:to="loc_swx_SmallCommercialMember_2c2baee3-cfab-4b20-97bb-bafc225ac203" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LargeCommercialMember_49fb872a-4d92-41ed-a074-bab208928e31" xlink:href="swx-20210930.xsd#swx_LargeCommercialMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_NameOfMajorCustomerDomain_81291846-f44b-4f04-b6a8-44b7735841a7" xlink:to="loc_swx_LargeCommercialMember_49fb872a-4d92-41ed-a074-bab208928e31" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_IndustrialOrOtherMember_48eebdcd-cbc8-46e8-b313-aa6e29d53678" xlink:href="swx-20210930.xsd#swx_IndustrialOrOtherMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_NameOfMajorCustomerDomain_81291846-f44b-4f04-b6a8-44b7735841a7" xlink:to="loc_swx_IndustrialOrOtherMember_48eebdcd-cbc8-46e8-b313-aa6e29d53678" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_TransportationMember_12135ed5-ac90-4a26-9001-8e0208bc3676" xlink:href="swx-20210930.xsd#swx_TransportationMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_NameOfMajorCustomerDomain_81291846-f44b-4f04-b6a8-44b7735841a7" xlink:to="loc_swx_TransportationMember_12135ed5-ac90-4a26-9001-8e0208bc3676" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_e3a251c6-a59e-4826-b86b-6b9e7b207178" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8d1a3827-4d22-409a-ab99-d87ffecb7165" xlink:to="loc_us-gaap_DisaggregationOfRevenueLineItems_e3a251c6-a59e-4826-b86b-6b9e7b207178" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_36a65792-03aa-4eb2-8929-55a2fa51f341" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_e3a251c6-a59e-4826-b86b-6b9e7b207178" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_36a65792-03aa-4eb2-8929-55a2fa51f341" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AlternativeRevenueProgramRevenuesDeferrals_59dd030c-c304-4d2d-8775-f739c093c68c" xlink:href="swx-20210930.xsd#swx_AlternativeRevenueProgramRevenuesDeferrals"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_e3a251c6-a59e-4826-b86b-6b9e7b207178" xlink:to="loc_swx_AlternativeRevenueProgramRevenuesDeferrals_59dd030c-c304-4d2d-8775-f739c093c68c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherRevenue_c1d13804-b070-43c9-a037-f50999af4e6e" xlink:href="swx-20210930.xsd#swx_OtherRevenue"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_e3a251c6-a59e-4826-b86b-6b9e7b207178" xlink:to="loc_swx_OtherRevenue_c1d13804-b070-43c9-a037-f50999af4e6e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatedOperatingRevenueGas_dbf3a00a-f2c8-4ab6-a563-4f0f802fdec8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RegulatedOperatingRevenueGas"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_e3a251c6-a59e-4826-b86b-6b9e7b207178" xlink:to="loc_us-gaap_RegulatedOperatingRevenueGas_dbf3a00a-f2c8-4ab6-a563-4f0f802fdec8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueSummaryofRevenueDisaggregatedbyServiceTypeandContractTypeDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueSummaryofRevenueDisaggregatedbyServiceTypeandContractTypeDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueSummaryofRevenueDisaggregatedbyServiceTypeandContractTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_7b6283d9-4209-4dbd-81b4-f07db352a2ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8f07ef99-1cb4-4223-bcc8-8a8c69abf3fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_7b6283d9-4209-4dbd-81b4-f07db352a2ba" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8f07ef99-1cb4-4223-bcc8-8a8c69abf3fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_bc21d2e1-d063-4afe-83d8-9e45589cabd9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8f07ef99-1cb4-4223-bcc8-8a8c69abf3fb" xlink:to="loc_srt_ProductOrServiceAxis_bc21d2e1-d063-4afe-83d8-9e45589cabd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c46af6a2-bef7-40bf-a445-149469295220" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductOrServiceAxis_bc21d2e1-d063-4afe-83d8-9e45589cabd9" xlink:to="loc_srt_ProductsAndServicesDomain_c46af6a2-bef7-40bf-a445-149469295220" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_GasInfrastructureServicesMember_bea39288-8072-4f71-a31b-9dcaf3082926" xlink:href="swx-20210930.xsd#swx_GasInfrastructureServicesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_c46af6a2-bef7-40bf-a445-149469295220" xlink:to="loc_swx_GasInfrastructureServicesMember_bea39288-8072-4f71-a31b-9dcaf3082926" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ElectricPowerInfrastructureServicesMember_4653232b-ffae-42b4-865e-295708ea8a45" xlink:href="swx-20210930.xsd#swx_ElectricPowerInfrastructureServicesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_c46af6a2-bef7-40bf-a445-149469295220" xlink:to="loc_swx_ElectricPowerInfrastructureServicesMember_4653232b-ffae-42b4-865e-295708ea8a45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherInfrastructureServicesMember_661d933e-8989-4d59-ac04-566f99ea6a93" xlink:href="swx-20210930.xsd#swx_OtherInfrastructureServicesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_c46af6a2-bef7-40bf-a445-149469295220" xlink:to="loc_swx_OtherInfrastructureServicesMember_661d933e-8989-4d59-ac04-566f99ea6a93" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_2cb8a68c-890e-4238-86e3-835ef991fc81" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8f07ef99-1cb4-4223-bcc8-8a8c69abf3fb" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_2cb8a68c-890e-4238-86e3-835ef991fc81" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_2edc9b31-e0ae-4e0a-a5c8-0301e50ee839" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_2cb8a68c-890e-4238-86e3-835ef991fc81" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_2edc9b31-e0ae-4e0a-a5c8-0301e50ee839" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_MasterServicesAgreementMember_93267c48-05c1-40dc-9e2e-95255d7f647c" xlink:href="swx-20210930.xsd#swx_MasterServicesAgreementMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_2edc9b31-e0ae-4e0a-a5c8-0301e50ee839" xlink:to="loc_swx_MasterServicesAgreementMember_93267c48-05c1-40dc-9e2e-95255d7f647c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BidContractMember_f5421e52-a0d9-469e-a614-aef7ccc38e7a" xlink:href="swx-20210930.xsd#swx_BidContractMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_2edc9b31-e0ae-4e0a-a5c8-0301e50ee839" xlink:to="loc_swx_BidContractMember_f5421e52-a0d9-469e-a614-aef7ccc38e7a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_UnitPricedContractsMember_4578a471-05da-4a30-995a-f1867e4bf18a" xlink:href="swx-20210930.xsd#swx_UnitPricedContractsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_2edc9b31-e0ae-4e0a-a5c8-0301e50ee839" xlink:to="loc_swx_UnitPricedContractsMember_4578a471-05da-4a30-995a-f1867e4bf18a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedPriceContractMember_8aa43eb5-735c-45de-a8cd-d15ac9e110ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FixedPriceContractMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_2edc9b31-e0ae-4e0a-a5c8-0301e50ee839" xlink:to="loc_us-gaap_FixedPriceContractMember_8aa43eb5-735c-45de-a8cd-d15ac9e110ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeAndMaterialsContractMember_5c730bcc-3400-449c-ad6f-85ac9aa8a501" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TimeAndMaterialsContractMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_2edc9b31-e0ae-4e0a-a5c8-0301e50ee839" xlink:to="loc_us-gaap_TimeAndMaterialsContractMember_5c730bcc-3400-449c-ad6f-85ac9aa8a501" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a4729026-bd21-444e-a5fa-dd42af021ed9" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8f07ef99-1cb4-4223-bcc8-8a8c69abf3fb" xlink:to="loc_dei_LegalEntityAxis_a4729026-bd21-444e-a5fa-dd42af021ed9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2d529bdc-1a6a-41d0-a7d8-9d74d6074759" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_a4729026-bd21-444e-a5fa-dd42af021ed9" xlink:to="loc_dei_EntityDomain_2d529bdc-1a6a-41d0-a7d8-9d74d6074759" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_15e7f82b-defd-4471-9947-35474dc6065d" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_2d529bdc-1a6a-41d0-a7d8-9d74d6074759" xlink:to="loc_swx_CenturiGroupInc.Member_15e7f82b-defd-4471-9947-35474dc6065d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_c42e870c-2de7-40db-81b4-9c78b56c087b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8f07ef99-1cb4-4223-bcc8-8a8c69abf3fb" xlink:to="loc_us-gaap_DisaggregationOfRevenueLineItems_c42e870c-2de7-40db-81b4-9c78b56c087b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0aaf3f82-fda7-4cd9-a45a-c461eaa09163" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_c42e870c-2de7-40db-81b4-9c78b56c087b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0aaf3f82-fda7-4cd9-a45a-c461eaa09163" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueSummaryofInformationaboutReceivablesDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueSummaryofInformationaboutReceivablesDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueSummaryofInformationaboutReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_f1f63d25-c81e-4279-aaf0-dfb23240b2d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_6cf501dc-169d-44bc-a090-dafea7bbf094" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_f1f63d25-c81e-4279-aaf0-dfb23240b2d0" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_6cf501dc-169d-44bc-a090-dafea7bbf094" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable_d8271b75-b108-467b-a1c1-1589ecb69cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetReclassifiedToReceivable"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_f1f63d25-c81e-4279-aaf0-dfb23240b2d0" xlink:to="loc_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable_d8271b75-b108-467b-a1c1-1589ecb69cb7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_d456b00c-03f9-4e01-99c1-baa9db6c4f5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_f1f63d25-c81e-4279-aaf0-dfb23240b2d0" xlink:to="loc_us-gaap_ContractWithCustomerLiability_d456b00c-03f9-4e01-99c1-baa9db6c4f5e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueNarrativesDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueNarrativesDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueNarrativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_475aeda2-e16d-41fb-9d40-c56a0b8f10f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_7789efd4-6da7-4e38-b646-7d9682a215b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_475aeda2-e16d-41fb-9d40-c56a0b8f10f8" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_7789efd4-6da7-4e38-b646-7d9682a215b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_be12693a-2c2a-440c-a6da-0a76c1186e0f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_7789efd4-6da7-4e38-b646-7d9682a215b8" xlink:to="loc_dei_LegalEntityAxis_be12693a-2c2a-440c-a6da-0a76c1186e0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cb2f1cf8-5302-4ce5-9722-d0d157f8ae66" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_be12693a-2c2a-440c-a6da-0a76c1186e0f" xlink:to="loc_dei_EntityDomain_cb2f1cf8-5302-4ce5-9722-d0d157f8ae66" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_d9adf432-dc43-4c2e-aaff-cc00e0c0eed0" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_cb2f1cf8-5302-4ce5-9722-d0d157f8ae66" xlink:to="loc_swx_CenturiGroupInc.Member_d9adf432-dc43-4c2e-aaff-cc00e0c0eed0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_ce1bc19e-98bd-4eda-88cb-a7b91ee386fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_7789efd4-6da7-4e38-b646-7d9682a215b8" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_ce1bc19e-98bd-4eda-88cb-a7b91ee386fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_3282810e-1c4d-427a-8d23-56e60a91d85d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_ce1bc19e-98bd-4eda-88cb-a7b91ee386fd" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_3282810e-1c4d-427a-8d23-56e60a91d85d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_RevenueRecognitionNumberOfContractsWithOriginalDurationMoreThanOneYear_e1093832-ab50-41ba-adde-9be829289833" xlink:href="swx-20210930.xsd#swx_RevenueRecognitionNumberOfContractsWithOriginalDurationMoreThanOneYear"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_ce1bc19e-98bd-4eda-88cb-a7b91ee386fd" xlink:to="loc_swx_RevenueRecognitionNumberOfContractsWithOriginalDurationMoreThanOneYear_e1093832-ab50-41ba-adde-9be829289833" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueRevenuePerformanceObligationDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueRevenuePerformanceObligationDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueRevenuePerformanceObligationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_7cc133ce-6029-41f0-8387-7297ce5dd50f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_05f6c457-5bb0-410a-aa56-349ae46afa41" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_7cc133ce-6029-41f0-8387-7297ce5dd50f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_05f6c457-5bb0-410a-aa56-349ae46afa41" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_7d4c9761-3b94-464c-995b-1d7878e421e4" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_05f6c457-5bb0-410a-aa56-349ae46afa41" xlink:to="loc_dei_LegalEntityAxis_7d4c9761-3b94-464c-995b-1d7878e421e4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_560b4327-31ee-4c37-9feb-6f8d61b7f80f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_7d4c9761-3b94-464c-995b-1d7878e421e4" xlink:to="loc_dei_EntityDomain_560b4327-31ee-4c37-9feb-6f8d61b7f80f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_0e57a317-43d0-499d-b397-ab82fd2adcae" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_560b4327-31ee-4c37-9feb-6f8d61b7f80f" xlink:to="loc_swx_CenturiGroupInc.Member_0e57a317-43d0-499d-b397-ab82fd2adcae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_dc7b85e2-937d-4a3d-b1ce-85a564417e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_05f6c457-5bb0-410a-aa56-349ae46afa41" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_dc7b85e2-937d-4a3d-b1ce-85a564417e4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_af9f9710-dc06-4a83-8a4f-11371c5992d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_05f6c457-5bb0-410a-aa56-349ae46afa41" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_af9f9710-dc06-4a83-8a4f-11371c5992d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_1c0a6260-7362-44a7-b0c2-837a015c8c42" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_af9f9710-dc06-4a83-8a4f-11371c5992d9" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_1c0a6260-7362-44a7-b0c2-837a015c8c42" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_dfda720a-db62-4a71-b685-c76899f60b77" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_af9f9710-dc06-4a83-8a4f-11371c5992d9" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_dfda720a-db62-4a71-b685-c76899f60b77" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueRevenuePerformanceObligationDetails_1" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueRevenuePerformanceObligationDetails_1"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueRevenuePerformanceObligationDetails_1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.swgas.com/role/RevenueScheduleofUtilityInfrastructureServicesContractsReceivableDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#RevenueScheduleofUtilityInfrastructureServicesContractsReceivableDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/RevenueScheduleofUtilityInfrastructureServicesContractsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_6ece0f3e-9db2-4acc-a2cb-33631a9f9deb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_6efde9e7-543e-484c-97d1-7e32ebb1f4ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_6ece0f3e-9db2-4acc-a2cb-33631a9f9deb" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_6efde9e7-543e-484c-97d1-7e32ebb1f4ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_b8124b4a-a295-493b-8e97-9ceff899c30c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6efde9e7-543e-484c-97d1-7e32ebb1f4ae" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_b8124b4a-a295-493b-8e97-9ceff899c30c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_90f93079-b0ca-4031-9b87-5727ed5ce1a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_b8124b4a-a295-493b-8e97-9ceff899c30c" xlink:to="loc_us-gaap_ReceivableTypeDomain_90f93079-b0ca-4031-9b87-5727ed5ce1a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BilledOnCompletedContractsAndContractsInProgressMember_7bd5f297-ed92-41af-9d6b-f4fc80b0af40" xlink:href="swx-20210930.xsd#swx_BilledOnCompletedContractsAndContractsInProgressMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReceivableTypeDomain_90f93079-b0ca-4031-9b87-5727ed5ce1a1" xlink:to="loc_swx_BilledOnCompletedContractsAndContractsInProgressMember_7bd5f297-ed92-41af-9d6b-f4fc80b0af40" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_OtherReceivablesMember_7158bedd-d3bc-410b-a17f-7681641f0453" xlink:href="swx-20210930.xsd#swx_OtherReceivablesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReceivableTypeDomain_90f93079-b0ca-4031-9b87-5727ed5ce1a1" xlink:to="loc_swx_OtherReceivablesMember_7158bedd-d3bc-410b-a17f-7681641f0453" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_9a226987-11b3-41f8-8cda-8aef9634bf0b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6efde9e7-543e-484c-97d1-7e32ebb1f4ae" xlink:to="loc_us-gaap_DisaggregationOfRevenueLineItems_9a226987-11b3-41f8-8cda-8aef9634bf0b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetGross_f6717772-8a79-43a7-8d13-a714bd444854" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetGross"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9a226987-11b3-41f8-8cda-8aef9634bf0b" xlink:to="loc_us-gaap_ContractWithCustomerAssetGross_f6717772-8a79-43a7-8d13-a714bd444854" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss_7ca4dc90-8138-42bb-a97e-bb976b7892a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9a226987-11b3-41f8-8cda-8aef9634bf0b" xlink:to="loc_us-gaap_ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss_7ca4dc90-8138-42bb-a97e-bb976b7892a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_054ee0f1-225d-45c7-8426-91c220055623" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetNet"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9a226987-11b3-41f8-8cda-8aef9634bf0b" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_054ee0f1-225d-45c7-8426-91c220055623" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CommonStock" xlink:type="simple" xlink:href="swx-20210930.xsd#CommonStock"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CommonStock" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_540dad31-a7a8-469c-bfd4-d8c55c34257a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CommonStockDisclosureTextBlock_de6341c2-3acc-4b55-82bd-d9bea27e010b" xlink:href="swx-20210930.xsd#swx_CommonStockDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_540dad31-a7a8-469c-bfd4-d8c55c34257a" xlink:to="loc_swx_CommonStockDisclosureTextBlock_de6341c2-3acc-4b55-82bd-d9bea27e010b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CommonStockTables" xlink:type="simple" xlink:href="swx-20210930.xsd#CommonStockTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CommonStockTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_48345b31-40a0-45a1-ac5f-0faf1e0f66ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ScheduleOfCommonStockActivityTableTextBlock_bff7b42f-1843-413c-b015-9cb41cf115bd" xlink:href="swx-20210930.xsd#swx_ScheduleOfCommonStockActivityTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_48345b31-40a0-45a1-ac5f-0faf1e0f66ec" xlink:to="loc_swx_ScheduleOfCommonStockActivityTableTextBlock_bff7b42f-1843-413c-b015-9cb41cf115bd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/CommonStockDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#CommonStockDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/CommonStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_42e2e21c-c12c-4aa6-b90f-13d81903996c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_5a90070d-25ff-4c89-8ea4-8c217c013480" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_42e2e21c-c12c-4aa6-b90f-13d81903996c" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_5a90070d-25ff-4c89-8ea4-8c217c013480" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_945c8c56-61cc-4b5d-a2e7-163f242e59ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_5a90070d-25ff-4c89-8ea4-8c217c013480" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_945c8c56-61cc-4b5d-a2e7-163f242e59ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_1ca0a927-ecb0-4140-bba7-9cd4651266d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_945c8c56-61cc-4b5d-a2e7-163f242e59ea" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_1ca0a927-ecb0-4140-bba7-9cd4651266d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_EquityShelfProgramMember_aabf5e9e-937c-4206-8b2f-e4918e37f1cf" xlink:href="swx-20210930.xsd#swx_EquityShelfProgramMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_1ca0a927-ecb0-4140-bba7-9cd4651266d4" xlink:to="loc_swx_EquityShelfProgramMember_aabf5e9e-937c-4206-8b2f-e4918e37f1cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_cf880b5b-66fc-4794-b8cf-aa56304a6666" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_5a90070d-25ff-4c89-8ea4-8c217c013480" xlink:to="loc_us-gaap_PlanNameAxis_cf880b5b-66fc-4794-b8cf-aa56304a6666" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_fd17650f-8442-45b8-b5cb-f4109ca0e786" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_cf880b5b-66fc-4794-b8cf-aa56304a6666" xlink:to="loc_us-gaap_PlanNameDomain_fd17650f-8442-45b8-b5cb-f4109ca0e786" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_RestrictedStockUnitPlanAndManagementIncentivePlanMember_0a449045-26cc-46e2-93ec-08ca6308c8be" xlink:href="swx-20210930.xsd#swx_RestrictedStockUnitPlanAndManagementIncentivePlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_fd17650f-8442-45b8-b5cb-f4109ca0e786" xlink:to="loc_swx_RestrictedStockUnitPlanAndManagementIncentivePlanMember_0a449045-26cc-46e2-93ec-08ca6308c8be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DividendReinvestmentAndStockPurchasePlanMember_63be87f2-0799-4c03-bb74-587da2aa62b6" xlink:href="swx-20210930.xsd#swx_DividendReinvestmentAndStockPurchasePlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_fd17650f-8442-45b8-b5cb-f4109ca0e786" xlink:to="loc_swx_DividendReinvestmentAndStockPurchasePlanMember_63be87f2-0799-4c03-bb74-587da2aa62b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_960c97e4-9420-4891-b4f1-b386bac34df7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_5a90070d-25ff-4c89-8ea4-8c217c013480" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_960c97e4-9420-4891-b4f1-b386bac34df7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a348865e-19ee-4c37-b8f8-b02feb916abe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_960c97e4-9420-4891-b4f1-b386bac34df7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a348865e-19ee-4c37-b8f8-b02feb916abe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_3430e1a7-e626-4383-9ae9-535be987bece" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_a348865e-19ee-4c37-b8f8-b02feb916abe" xlink:to="loc_us-gaap_SubsequentEventMember_3430e1a7-e626-4383-9ae9-535be987bece" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_5a90070d-25ff-4c89-8ea4-8c217c013480" xlink:to="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SaleOfStockAmountOfCommonStockOfferedForSale_f791f305-3974-417e-bac9-85f75195795c" xlink:href="swx-20210930.xsd#swx_SaleOfStockAmountOfCommonStockOfferedForSale"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_swx_SaleOfStockAmountOfCommonStockOfferedForSale_f791f305-3974-417e-bac9-85f75195795c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ProceedsFromIssuanceOfCommonStockGross_6c395198-c388-4eaf-b934-c3f0d9b8ef1b" xlink:href="swx-20210930.xsd#swx_ProceedsFromIssuanceOfCommonStockGross"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_swx_ProceedsFromIssuanceOfCommonStockGross_6c395198-c388-4eaf-b934-c3f0d9b8ef1b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_acac76d9-4c19-4a28-aca3-78d709c2055e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_acac76d9-4c19-4a28-aca3-78d709c2055e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_6cb0b2cc-d081-4271-89bb-c95271a4110e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_6cb0b2cc-d081-4271-89bb-c95271a4110e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_ce4d0656-c912-44a6-9863-d2249982702e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_ce4d0656-c912-44a6-9863-d2249982702e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CommonStockWeightedAverageIssuePricePerShare_3a30ab7a-3920-4696-87f7-140837bec255" xlink:href="swx-20210930.xsd#swx_CommonStockWeightedAverageIssuePricePerShare"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_swx_CommonStockWeightedAverageIssuePricePerShare_3a30ab7a-3920-4696-87f7-140837bec255" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_f52ecf7f-adb9-49c0-939b-8f7a552aedcd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_f52ecf7f-adb9-49c0-939b-8f7a552aedcd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_57a5cddd-974f-43d6-90f9-b7ea42c008de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_57a5cddd-974f-43d6-90f9-b7ea42c008de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DividendsCommonStockPaidInKindNumberOfPreferredStockPurchaseRight_37ca01e0-52a8-4acc-9024-d26a8954e33a" xlink:href="swx-20210930.xsd#swx_DividendsCommonStockPaidInKindNumberOfPreferredStockPurchaseRight"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_swx_DividendsCommonStockPaidInKindNumberOfPreferredStockPurchaseRight_37ca01e0-52a8-4acc-9024-d26a8954e33a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_5042ad1c-60ce-4bb0-8be6-ad3236aff970" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_5042ad1c-60ce-4bb0-8be6-ad3236aff970" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_PreferredStockPurchaseRightPurchasePricePerUnit_eb41a8a8-7e1d-4af0-8eeb-7be254d28d77" xlink:href="swx-20210930.xsd#swx_PreferredStockPurchaseRightPurchasePricePerUnit"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_swx_PreferredStockPurchaseRightPurchasePricePerUnit_eb41a8a8-7e1d-4af0-8eeb-7be254d28d77" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmark_fe6eec07-3b0e-4437-9e59-a22db283ec75" xlink:href="swx-20210930.xsd#swx_PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmark"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_swx_PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmark_fe6eec07-3b0e-4437-9e59-a22db283ec75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmarkWithPassiveInstitutionalInvestor_a1daba75-c680-42cc-9960-3381e69076ac" xlink:href="swx-20210930.xsd#swx_PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmarkWithPassiveInstitutionalInvestor"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_88586008-80ef-4d00-a70b-0c7f5a10a900" xlink:to="loc_swx_PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmarkWithPassiveInstitutionalInvestor_a1daba75-c680-42cc-9960-3381e69076ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/Debt" xlink:type="simple" xlink:href="swx-20210930.xsd#Debt"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/Debt" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_cd225763-fef0-4dac-8bcd-300e97a7605e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_cfd1a107-54bc-4eda-8329-0cfef2a33534" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_cd225763-fef0-4dac-8bcd-300e97a7605e" xlink:to="loc_us-gaap_DebtDisclosureTextBlock_cfd1a107-54bc-4eda-8329-0cfef2a33534" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/DebtTables" xlink:type="simple" xlink:href="swx-20210930.xsd#DebtTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/DebtTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_25f089e7-081e-477d-80de-801cdfd2465a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_1163604a-d980-43a8-ba88-f2a9d633b298" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_25f089e7-081e-477d-80de-801cdfd2465a" xlink:to="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_1163604a-d980-43a8-ba88-f2a9d633b298" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/DebtScheduleofCarryingAmountsandEstimatedFairValuesofLongTermDebtDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#DebtScheduleofCarryingAmountsandEstimatedFairValuesofLongTermDebtDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/DebtScheduleofCarryingAmountsandEstimatedFairValuesofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_396a1500-41d5-4c72-8c88-b88b66405328" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_396a1500-41d5-4c72-8c88-b88b66405328" xlink:to="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_e412b9e1-64cb-49e0-be0f-2b9027dc6d68" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_e412b9e1-64cb-49e0-be0f-2b9027dc6d68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3fd1920e-a326-40d4-ae68-b3d2ce66f774" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_e412b9e1-64cb-49e0-be0f-2b9027dc6d68" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3fd1920e-a326-40d4-ae68-b3d2ce66f774" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c2123805-1616-45b5-80fb-b18d5687c7f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3fd1920e-a326-40d4-ae68-b3d2ce66f774" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c2123805-1616-45b5-80fb-b18d5687c7f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_3956934c-9186-4335-b0df-d9c0958c17e3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3fd1920e-a326-40d4-ae68-b3d2ce66f774" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_3956934c-9186-4335-b0df-d9c0958c17e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_cd01db0c-71a4-4df0-8b94-d27cca9e9f17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3fd1920e-a326-40d4-ae68-b3d2ce66f774" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_cd01db0c-71a4-4df0-8b94-d27cca9e9f17" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_9705d8b5-072b-49e0-b933-c1947cacc759" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:to="loc_us-gaap_DebtInstrumentAxis_9705d8b5-072b-49e0-b933-c1947cacc759" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_66e2e9ea-ac80-479a-8dd3-eee962f9c7a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_9705d8b5-072b-49e0-b933-c1947cacc759" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_66e2e9ea-ac80-479a-8dd3-eee962f9c7a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesMember_ca1bd961-2eb5-44f3-bff0-0b945660518b" xlink:href="swx-20210930.xsd#swx_DebenturesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_66e2e9ea-ac80-479a-8dd3-eee962f9c7a1" xlink:to="loc_swx_DebenturesMember_ca1bd961-2eb5-44f3-bff0-0b945660518b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_IndustrialDevelopmentRevenueBondsMember_88c8a653-fe82-48b2-aeab-52f46bb3c83c" xlink:href="swx-20210930.xsd#swx_IndustrialDevelopmentRevenueBondsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_66e2e9ea-ac80-479a-8dd3-eee962f9c7a1" xlink:to="loc_swx_IndustrialDevelopmentRevenueBondsMember_88c8a653-fe82-48b2-aeab-52f46bb3c83c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_fc1cf3b7-ff70-4cae-90cd-51e8b190ec18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_fc1cf3b7-ff70-4cae-90cd-51e8b190ec18" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_fc1cf3b7-ff70-4cae-90cd-51e8b190ec18" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesSixPointOnePercentageDueTwoThousandAndFortyOneMember_54ff9aeb-3b88-435e-aa07-f76f750492dc" xlink:href="swx-20210930.xsd#swx_DebenturesNotesSixPointOnePercentageDueTwoThousandAndFortyOneMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesSixPointOnePercentageDueTwoThousandAndFortyOneMember_54ff9aeb-3b88-435e-aa07-f76f750492dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesThreePointEightSevenFivePercentageDueTwoThousandAndTwentyTwoMember_800b19ef-1ce5-433d-bdf5-7cb913e0c859" xlink:href="swx-20210930.xsd#swx_DebenturesNotesThreePointEightSevenFivePercentageDueTwoThousandAndTwentyTwoMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesThreePointEightSevenFivePercentageDueTwoThousandAndTwentyTwoMember_800b19ef-1ce5-433d-bdf5-7cb913e0c859" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesFourPointEightSevenFivePercentageDueTwoThousandAndFortyThreeMember_604f4ef6-f034-4fb0-88af-bab9716531aa" xlink:href="swx-20210930.xsd#swx_DebenturesNotesFourPointEightSevenFivePercentageDueTwoThousandAndFortyThreeMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesFourPointEightSevenFivePercentageDueTwoThousandAndFortyThreeMember_604f4ef6-f034-4fb0-88af-bab9716531aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesThreePointEightPercentageDueTwoThousandAndFortySixMember_0b15e48c-bd2b-43f9-a667-eaeb01c5c794" xlink:href="swx-20210930.xsd#swx_DebenturesNotesThreePointEightPercentageDueTwoThousandAndFortySixMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesThreePointEightPercentageDueTwoThousandAndFortySixMember_0b15e48c-bd2b-43f9-a667-eaeb01c5c794" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesThreePointSevenPercentageDueTwoThousandAndTwentyEightMember_77002ee2-3ace-4979-9ab6-c81fbf17a0e3" xlink:href="swx-20210930.xsd#swx_DebenturesNotesThreePointSevenPercentageDueTwoThousandAndTwentyEightMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesThreePointSevenPercentageDueTwoThousandAndTwentyEightMember_77002ee2-3ace-4979-9ab6-c81fbf17a0e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesFourPointFifteenPercentageDueTwoThousandAndFortyNineMember_b8c4a33e-e735-45a5-8172-8205fb886bac" xlink:href="swx-20210930.xsd#swx_DebenturesNotesFourPointFifteenPercentageDueTwoThousandAndFortyNineMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesFourPointFifteenPercentageDueTwoThousandAndFortyNineMember_b8c4a33e-e735-45a5-8172-8205fb886bac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesTwoPointTwoPercentageDueTwoThousandAndThirtyMember_c79920ee-a091-4388-bae7-308c96630570" xlink:href="swx-20210930.xsd#swx_DebenturesNotesTwoPointTwoPercentageDueTwoThousandAndThirtyMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesTwoPointTwoPercentageDueTwoThousandAndThirtyMember_c79920ee-a091-4388-bae7-308c96630570" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesThreePointEighteenPercentageDueTwoThousandAndFiftyOneMember_90ab18cb-0649-4527-a36f-d22df356d337" xlink:href="swx-20210930.xsd#swx_DebenturesNotesThreePointEighteenPercentageDueTwoThousandAndFiftyOneMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesNotesThreePointEighteenPercentageDueTwoThousandAndFiftyOneMember_90ab18cb-0649-4527-a36f-d22df356d337" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesEightPercentageSeriesDueTwoThousandAndTwentySixMember_1b9f1e7e-41fe-4c5f-9b4a-7535ba3cf58a" xlink:href="swx-20210930.xsd#swx_DebenturesEightPercentageSeriesDueTwoThousandAndTwentySixMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesEightPercentageSeriesDueTwoThousandAndTwentySixMember_1b9f1e7e-41fe-4c5f-9b4a-7535ba3cf58a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesMediumTermNotesSevenPointSevenEightPercentageSeriesDueTwoThousandAndTwentyTwoMember_59501efb-3861-455c-af8d-9a67aef826f3" xlink:href="swx-20210930.xsd#swx_DebenturesMediumTermNotesSevenPointSevenEightPercentageSeriesDueTwoThousandAndTwentyTwoMember"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesMediumTermNotesSevenPointSevenEightPercentageSeriesDueTwoThousandAndTwentyTwoMember_59501efb-3861-455c-af8d-9a67aef826f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesMediumTermNotesSevenPointNineTwoPercentageSeriesDueTwoThousandAndTwentySevenMember_2ad87e0b-53bd-47e0-822c-f7244450e0d6" xlink:href="swx-20210930.xsd#swx_DebenturesMediumTermNotesSevenPointNineTwoPercentageSeriesDueTwoThousandAndTwentySevenMember"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesMediumTermNotesSevenPointNineTwoPercentageSeriesDueTwoThousandAndTwentySevenMember_2ad87e0b-53bd-47e0-822c-f7244450e0d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesMediumTermNotesSixPointSevenSixPercentageSeriesDueTwoThousandAndTwentySevenMember_8ffb294f-9ac1-4a63-85a5-6178613140ef" xlink:href="swx-20210930.xsd#swx_DebenturesMediumTermNotesSixPointSevenSixPercentageSeriesDueTwoThousandAndTwentySevenMember"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_DebenturesMediumTermNotesSixPointSevenSixPercentageSeriesDueTwoThousandAndTwentySevenMember_8ffb294f-9ac1-4a63-85a5-6178613140ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_RevolvingCreditFacilityAndCommercialPaperMember_d2fc906e-5757-4e2c-998d-3b87bb5f3714" xlink:href="swx-20210930.xsd#swx_RevolvingCreditFacilityAndCommercialPaperMember"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_RevolvingCreditFacilityAndCommercialPaperMember_d2fc906e-5757-4e2c-998d-3b87bb5f3714" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_VariableRateBondsTaxExemptSeriesADueTwoThousandAndTwentyEightMember_897d6c18-5ce6-41ad-8517-0c80907c266d" xlink:href="swx-20210930.xsd#swx_VariableRateBondsTaxExemptSeriesADueTwoThousandAndTwentyEightMember"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_VariableRateBondsTaxExemptSeriesADueTwoThousandAndTwentyEightMember_897d6c18-5ce6-41ad-8517-0c80907c266d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_VariableRateBondsTwoThousandAndThreeSeriesADueTwoThousandAndThirtyEightMember_7f265e35-6f7d-4fb9-8e20-f29881be4533" xlink:href="swx-20210930.xsd#swx_VariableRateBondsTwoThousandAndThreeSeriesADueTwoThousandAndThirtyEightMember"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_VariableRateBondsTwoThousandAndThreeSeriesADueTwoThousandAndThirtyEightMember_7f265e35-6f7d-4fb9-8e20-f29881be4533" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_VariableRateBondsTwoThousandAndEightSeriesADueTwoThousandAndThirtyEightMember_695f2adb-4cc5-44fc-a144-bd2795d8c9d1" xlink:href="swx-20210930.xsd#swx_VariableRateBondsTwoThousandAndEightSeriesADueTwoThousandAndThirtyEightMember"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_VariableRateBondsTwoThousandAndEightSeriesADueTwoThousandAndThirtyEightMember_695f2adb-4cc5-44fc-a144-bd2795d8c9d1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_VariableRateBondsTwoThousandAndNineSeriesADueTwoThousandAndThirtyNineMember_257649de-4e76-4c43-8c97-94140df45197" xlink:href="swx-20210930.xsd#swx_VariableRateBondsTwoThousandAndNineSeriesADueTwoThousandAndThirtyNineMember"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_VariableRateBondsTwoThousandAndNineSeriesADueTwoThousandAndThirtyNineMember_257649de-4e76-4c43-8c97-94140df45197" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiTermLoanFacilityMember_8c54ba26-2f12-4915-bdd9-38570eb4e4ca" xlink:href="swx-20210930.xsd#swx_CenturiTermLoanFacilityMember"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_CenturiTermLoanFacilityMember_8c54ba26-2f12-4915-bdd9-38570eb4e4ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiOtherDebtObligationsMember_cc606c41-172b-4fc0-a4fd-4f4dacfa3c9d" xlink:href="swx-20210930.xsd#swx_CenturiOtherDebtObligationsMember"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a881024-b136-4fc1-9ec6-ba195e43ab24" xlink:to="loc_swx_CenturiOtherDebtObligationsMember_cc606c41-172b-4fc0-a4fd-4f4dacfa3c9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_2ff6c85c-5142-4993-bf7a-72d911b4357a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:to="loc_us-gaap_CreditFacilityAxis_2ff6c85c-5142-4993-bf7a-72d911b4357a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01106cd3-9d1b-4ed6-94c8-7892f3847af9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_2ff6c85c-5142-4993-bf7a-72d911b4357a" xlink:to="loc_us-gaap_CreditFacilityDomain_01106cd3-9d1b-4ed6-94c8-7892f3847af9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiSecuredRevolvingCreditFacilityMember_9fa76a89-9d9c-4543-a78a-77a0d5dbb3b2" xlink:href="swx-20210930.xsd#swx_CenturiSecuredRevolvingCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_01106cd3-9d1b-4ed6-94c8-7892f3847af9" xlink:to="loc_swx_CenturiSecuredRevolvingCreditFacilityMember_9fa76a89-9d9c-4543-a78a-77a0d5dbb3b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_7db50d28-2d70-4a70-97c0-930cfa38c4ff" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:to="loc_dei_LegalEntityAxis_7db50d28-2d70-4a70-97c0-930cfa38c4ff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_147d0573-ce62-4b30-8876-bd359b8714e5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_7db50d28-2d70-4a70-97c0-930cfa38c4ff" xlink:to="loc_dei_EntityDomain_147d0573-ce62-4b30-8876-bd359b8714e5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_9d2bb43e-eb7d-49cb-91a0-c97e59b54808" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_147d0573-ce62-4b30-8876-bd359b8714e5" xlink:to="loc_swx_SouthwestGasCorporationMember_9d2bb43e-eb7d-49cb-91a0-c97e59b54808" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_a30768d2-0d50-4a57-9868-75842780d1b9" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_147d0573-ce62-4b30-8876-bd359b8714e5" xlink:to="loc_swx_CenturiGroupInc.Member_a30768d2-0d50-4a57-9868-75842780d1b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_630649bd-65e9-477d-bdae-3a1115a035ba" xlink:to="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_d445e3b8-6ca8-46a3-8b6c-9f246006854a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_d445e3b8-6ca8-46a3-8b6c-9f246006854a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayable_f74b65b3-0720-4762-bd2d-4645d11e7116" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayable"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_NotesPayable_f74b65b3-0720-4762-bd2d-4645d11e7116" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_6c2560ae-36af-4eb4-ba90-4037858f88ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableFairValueDisclosure"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_6c2560ae-36af-4eb4-ba90-4037858f88ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebtInstrumentUnamortizedDiscountAndDebtIssuanceCosts_418852a0-2750-48cd-bc88-938b69e106a3" xlink:href="swx-20210930.xsd#swx_DebtInstrumentUnamortizedDiscountAndDebtIssuanceCosts"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_swx_DebtInstrumentUnamortizedDiscountAndDebtIssuanceCosts_418852a0-2750-48cd-bc88-938b69e106a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_ce07bcc6-3641-40aa-9387-72ce277dc177" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_LineOfCredit_ce07bcc6-3641-40aa-9387-72ce277dc177" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditFairValueDisclosure_78b0e392-5032-46ee-8c2a-24d3ef127586" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LinesOfCreditFairValueDisclosure"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_LinesOfCreditFairValueDisclosure_78b0e392-5032-46ee-8c2a-24d3ef127586" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_f95ae631-4a53-45eb-a8e4-0af28ca7c436" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnsecuredDebt"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_UnsecuredDebt_f95ae631-4a53-45eb-a8e4-0af28ca7c436" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_d5f8560c-ad75-4ff7-b775-5821a06ee00e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_LongTermDebtCurrent_d5f8560c-ad75-4ff7-b775-5821a06ee00e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_0f9fe2a0-e034-4594-89f0-2930b305c4ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_0f9fe2a0-e034-4594-89f0-2930b305c4ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_464aca50-5080-4f00-b9cd-b0788bade638" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_LongTermDebtFairValue_464aca50-5080-4f00-b9cd-b0788bade638" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_f52c8747-85a8-46f5-8721-3e10ba42740e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_f52c8747-85a8-46f5-8721-3e10ba42740e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5f1030a1-7e1f-4674-9dd9-f73f388a3db4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtCurrentAndNoncurrentAbstract"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5f1030a1-7e1f-4674-9dd9-f73f388a3db4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_243b8f94-c45c-4713-b142-015d2660dc0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5f1030a1-7e1f-4674-9dd9-f73f388a3db4" xlink:to="loc_us-gaap_LongTermDebtCurrent_243b8f94-c45c-4713-b142-015d2660dc0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_31cf5f77-8082-418a-a798-790c861ab7cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5f1030a1-7e1f-4674-9dd9-f73f388a3db4" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_31cf5f77-8082-418a-a798-790c861ab7cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_339e5a48-96d6-4407-b06f-c392acfa0270" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5f1030a1-7e1f-4674-9dd9-f73f388a3db4" xlink:to="loc_us-gaap_LongTermDebt_339e5a48-96d6-4407-b06f-c392acfa0270" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_bd0685c2-d891-4a07-9ee7-cb6002dc1996" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SecuredDebt"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_SecuredDebt_bd0685c2-d891-4a07-9ee7-cb6002dc1996" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_219ebb1e-b0ca-4e41-945d-df880cadd4b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLongTermDebt"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4870cb93-e234-4b2e-a0bf-e8913cfe9daf" xlink:to="loc_us-gaap_OtherLongTermDebt_219ebb1e-b0ca-4e41-945d-df880cadd4b0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/DebtNarrativesDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#DebtNarrativesDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/DebtNarrativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_a7dd018d-1194-41e1-9f0f-1fa376b8db45" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_a7dd018d-1194-41e1-9f0f-1fa376b8db45" xlink:to="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_3e06bb62-630e-4ad2-b657-34a54cad8d8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_us-gaap_CreditFacilityAxis_3e06bb62-630e-4ad2-b657-34a54cad8d8c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_6f41dc28-469f-4f44-aa31-09c806aa86aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_3e06bb62-630e-4ad2-b657-34a54cad8d8c" xlink:to="loc_us-gaap_CreditFacilityDomain_6f41dc28-469f-4f44-aa31-09c806aa86aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_A400MillionCreditFacilityMember_8a9be6dd-86cc-4dba-b02c-6cf49efa8992" xlink:href="swx-20210930.xsd#swx_A400MillionCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_6f41dc28-469f-4f44-aa31-09c806aa86aa" xlink:to="loc_swx_A400MillionCreditFacilityMember_8a9be6dd-86cc-4dba-b02c-6cf49efa8992" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_A100MillionCreditFacilityMember_446c8f81-df34-49f8-bf49-eb26b0dc56a3" xlink:href="swx-20210930.xsd#swx_A100MillionCreditFacilityMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_6f41dc28-469f-4f44-aa31-09c806aa86aa" xlink:to="loc_swx_A100MillionCreditFacilityMember_446c8f81-df34-49f8-bf49-eb26b0dc56a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiSecuredRevolvingCreditFacilityMember_a7f9e127-f67f-401b-9f28-5da279f708a3" xlink:href="swx-20210930.xsd#swx_CenturiSecuredRevolvingCreditFacilityMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_6f41dc28-469f-4f44-aa31-09c806aa86aa" xlink:to="loc_swx_CenturiSecuredRevolvingCreditFacilityMember_a7f9e127-f67f-401b-9f28-5da279f708a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_117bf75e-c95f-402a-a075-329901407b11" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_dei_LegalEntityAxis_117bf75e-c95f-402a-a075-329901407b11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_91e77713-3602-40cb-8b47-8985f5428d9d" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_117bf75e-c95f-402a-a075-329901407b11" xlink:to="loc_dei_EntityDomain_91e77713-3602-40cb-8b47-8985f5428d9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_ce476206-6d21-43fc-8f24-d6d2a738e170" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_91e77713-3602-40cb-8b47-8985f5428d9d" xlink:to="loc_swx_SouthwestGasCorporationMember_ce476206-6d21-43fc-8f24-d6d2a738e170" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_19e88e4f-97c3-4c90-bbf5-81478b8e4687" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_91e77713-3602-40cb-8b47-8985f5428d9d" xlink:to="loc_swx_CenturiGroupInc.Member_19e88e4f-97c3-4c90-bbf5-81478b8e4687" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_cf498d34-df45-46e9-b9cd-e421cc6cec7d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_us-gaap_VariableRateAxis_cf498d34-df45-46e9-b9cd-e421cc6cec7d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_55989f34-2357-438c-aa48-ab9ecbcb8f95" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateAxis_cf498d34-df45-46e9-b9cd-e421cc6cec7d" xlink:to="loc_us-gaap_VariableRateDomain_55989f34-2357-438c-aa48-ab9ecbcb8f95" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_05f2b32e-3efb-4cdd-ac88-0a198ac36df4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateDomain_55989f34-2357-438c-aa48-ab9ecbcb8f95" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_05f2b32e-3efb-4cdd-ac88-0a198ac36df4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_2cf94f67-a050-405b-a127-c67b13e772d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BaseRateMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateDomain_55989f34-2357-438c-aa48-ab9ecbcb8f95" xlink:to="loc_us-gaap_BaseRateMember_2cf94f67-a050-405b-a127-c67b13e772d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_fd561703-9af5-42c8-ab7e-f2c3348fa5f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_fd561703-9af5-42c8-ab7e-f2c3348fa5f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_fd561703-9af5-42c8-ab7e-f2c3348fa5f1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCreditFacilityMember_2a51753a-d5b9-4c6d-b397-7b2144a4ac0e" xlink:href="swx-20210930.xsd#swx_SouthwestGasCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:to="loc_swx_SouthwestGasCreditFacilityMember_2a51753a-d5b9-4c6d-b397-7b2144a4ac0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CommercialPaperProgramMember_737ae5d2-eda2-43f8-8934-5bd7a27b67b7" xlink:href="swx-20210930.xsd#swx_CommercialPaperProgramMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:to="loc_swx_CommercialPaperProgramMember_737ae5d2-eda2-43f8-8934-5bd7a27b67b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SecuredRevolvingCreditAndTermLoanFacilityMember_91409bcb-fa56-4284-a1e6-3ef81801d9d6" xlink:href="swx-20210930.xsd#swx_SecuredRevolvingCreditAndTermLoanFacilityMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:to="loc_swx_SecuredRevolvingCreditAndTermLoanFacilityMember_91409bcb-fa56-4284-a1e6-3ef81801d9d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiTermLoanFacilityMember_ed76d297-9318-497b-8a8c-347f84570c48" xlink:href="swx-20210930.xsd#swx_CenturiTermLoanFacilityMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:to="loc_swx_CenturiTermLoanFacilityMember_ed76d297-9318-497b-8a8c-347f84570c48" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesNotesThreePointEighteenPercentageDueTwoThousandAndFiftyOneMember_34b07859-d255-4c29-aba3-8fe30e8276d8" xlink:href="swx-20210930.xsd#swx_DebenturesNotesThreePointEighteenPercentageDueTwoThousandAndFiftyOneMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:to="loc_swx_DebenturesNotesThreePointEighteenPercentageDueTwoThousandAndFiftyOneMember_34b07859-d255-4c29-aba3-8fe30e8276d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiSecuredRevolvingCreditFacilityMember_48260c51-027b-4148-81da-489f44a53f06" xlink:href="swx-20210930.xsd#swx_CenturiSecuredRevolvingCreditFacilityMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fe5a27f4-d2d4-4c2a-b2b8-659cac2fafa0" xlink:to="loc_swx_CenturiSecuredRevolvingCreditFacilityMember_48260c51-027b-4148-81da-489f44a53f06" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_11b61234-b64d-475c-9e5a-0e8584b29fe7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_srt_RangeAxis_11b61234-b64d-475c-9e5a-0e8584b29fe7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9807b7e6-c361-470c-96c5-ce43809c4f9a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_11b61234-b64d-475c-9e5a-0e8584b29fe7" xlink:to="loc_srt_RangeMember_9807b7e6-c361-470c-96c5-ce43809c4f9a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_791eb2b9-52bf-42bd-8fd3-f11a5a99769b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_9807b7e6-c361-470c-96c5-ce43809c4f9a" xlink:to="loc_srt_MinimumMember_791eb2b9-52bf-42bd-8fd3-f11a5a99769b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4d78a225-bd11-4ac3-82e8-51f4a62d7d07" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_9807b7e6-c361-470c-96c5-ce43809c4f9a" xlink:to="loc_srt_MaximumMember_4d78a225-bd11-4ac3-82e8-51f4a62d7d07" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_9df6f3f5-d2ee-4a07-a9f0-dcfde7bc8c29" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_us-gaap_DebtInstrumentAxis_9df6f3f5-d2ee-4a07-a9f0-dcfde7bc8c29" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ad9b34c1-b7ac-4356-9964-e3d9e279c28d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_9df6f3f5-d2ee-4a07-a9f0-dcfde7bc8c29" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ad9b34c1-b7ac-4356-9964-e3d9e279c28d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_A250MillionTermLoanMember_cd8bd274-a5a3-4a1c-a5e6-75d6f34fa5b8" xlink:href="swx-20210930.xsd#swx_A250MillionTermLoanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ad9b34c1-b7ac-4356-9964-e3d9e279c28d" xlink:to="loc_swx_A250MillionTermLoanMember_cd8bd274-a5a3-4a1c-a5e6-75d6f34fa5b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebenturesMember_a2369458-3a87-4204-b4d4-18fd32b8c2e3" xlink:href="swx-20210930.xsd#swx_DebenturesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ad9b34c1-b7ac-4356-9964-e3d9e279c28d" xlink:to="loc_swx_DebenturesMember_a2369458-3a87-4204-b4d4-18fd32b8c2e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_TermLoanFacilityMember_5e1e4f59-a45a-4a9d-8388-3b7646e4d73b" xlink:href="swx-20210930.xsd#swx_TermLoanFacilityMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ad9b34c1-b7ac-4356-9964-e3d9e279c28d" xlink:to="loc_swx_TermLoanFacilityMember_5e1e4f59-a45a-4a9d-8388-3b7646e4d73b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_18d26bb7-ba4f-4bad-b548-1d861e0e4136" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_srt_StatementScenarioAxis_18d26bb7-ba4f-4bad-b548-1d861e0e4136" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_25eb2de7-8d5d-4814-9351-5219d1bca6bf" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementScenarioAxis_18d26bb7-ba4f-4bad-b548-1d861e0e4136" xlink:to="loc_srt_ScenarioUnspecifiedDomain_25eb2de7-8d5d-4814-9351-5219d1bca6bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_ce987f08-c905-40ad-8e3b-49c80687d82e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioForecastMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScenarioUnspecifiedDomain_25eb2de7-8d5d-4814-9351-5219d1bca6bf" xlink:to="loc_srt_ScenarioForecastMember_ce987f08-c905-40ad-8e3b-49c80687d82e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_38871a11-586d-41bf-9b7d-aafbae4b5ef1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_38871a11-586d-41bf-9b7d-aafbae4b5ef1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_f9f344e0-113f-4432-9dc6-f7383975ee8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_38871a11-586d-41bf-9b7d-aafbae4b5ef1" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_f9f344e0-113f-4432-9dc6-f7383975ee8a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_fa39d9e2-e12a-49d2-a48e-c37390761c42" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_f9f344e0-113f-4432-9dc6-f7383975ee8a" xlink:to="loc_us-gaap_SubsequentEventMember_fa39d9e2-e12a-49d2-a48e-c37390761c42" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_53e4d267-bb4a-44da-9c0a-9c64802e4f9b" xlink:to="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7be2fd75-e24d-4709-8834-60f1afacdb43" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7be2fd75-e24d-4709-8834-60f1afacdb43" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LineOfCreditFacilityAmountClassifiedAsLongTermDebt_09a820a9-43ba-459c-a566-3a5be4353478" xlink:href="swx-20210930.xsd#swx_LineOfCreditFacilityAmountClassifiedAsLongTermDebt"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_LineOfCreditFacilityAmountClassifiedAsLongTermDebt_09a820a9-43ba-459c-a566-3a5be4353478" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LineOfCreditFacilityWorkingCapitalPurposes_60b7aa5a-26f3-409d-8d29-e238e42af862" xlink:href="swx-20210930.xsd#swx_LineOfCreditFacilityWorkingCapitalPurposes"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_LineOfCreditFacilityWorkingCapitalPurposes_60b7aa5a-26f3-409d-8d29-e238e42af862" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_fb0c0669-cfc2-4e57-945d-00acff3a7487" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_fb0c0669-cfc2-4e57-945d-00acff3a7487" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_f8f731c6-d9cc-4f68-8f11-c4c4b5dc9a9a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_LongTermDebt_f8f731c6-d9cc-4f68-8f11-c4c4b5dc9a9a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_6e1b100c-9570-4bdb-aed0-e024f7c4ab06" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_LineOfCredit_6e1b100c-9570-4bdb-aed0-e024f7c4ab06" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_95c0d5e6-1f30-465c-87dc-ab2c979ae320" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_95c0d5e6-1f30-465c-87dc-ab2c979ae320" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebtInstrumentDiscountRate_2d29e4b0-23b2-444b-8910-f98c2a2b7d53" xlink:href="swx-20210930.xsd#swx_DebtInstrumentDiscountRate"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_DebtInstrumentDiscountRate_2d29e4b0-23b2-444b-8910-f98c2a2b7d53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_1b200733-0dfb-4439-86ca-205710915940" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_1b200733-0dfb-4439-86ca-205710915940" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebtInstrumentFloorInterestRate_21dec4fd-ec87-4723-b31f-57f8022f012f" xlink:href="swx-20210930.xsd#swx_DebtInstrumentFloorInterestRate"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_DebtInstrumentFloorInterestRate_21dec4fd-ec87-4723-b31f-57f8022f012f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_05e17dd9-19f9-4583-8e9d-2f9c56ee65c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_05e17dd9-19f9-4583-8e9d-2f9c56ee65c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LineOfCreditFacilityCovenantsMaximumNetLeverageRatio_4da75e47-05d3-4f09-916b-1945aca4ef28" xlink:href="swx-20210930.xsd#swx_LineOfCreditFacilityCovenantsMaximumNetLeverageRatio"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_LineOfCreditFacilityCovenantsMaximumNetLeverageRatio_4da75e47-05d3-4f09-916b-1945aca4ef28" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LineOfCreditFacilityCovenantsIncreaseInMaximumNetLeverageRatio_b55d64a0-87f0-4172-b940-28426d0c282d" xlink:href="swx-20210930.xsd#swx_LineOfCreditFacilityCovenantsIncreaseInMaximumNetLeverageRatio"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_LineOfCreditFacilityCovenantsIncreaseInMaximumNetLeverageRatio_b55d64a0-87f0-4172-b940-28426d0c282d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_LineOfCreditFacilityCovenantsMinimumInterestCoverageRatio_84d35c9b-681c-4371-affc-bd14a213a7c8" xlink:href="swx-20210930.xsd#swx_LineOfCreditFacilityCovenantsMinimumInterestCoverageRatio"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_LineOfCreditFacilityCovenantsMinimumInterestCoverageRatio_84d35c9b-681c-4371-affc-bd14a213a7c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCollateralAmount_747d84d6-f089-4b6c-99a6-394db7a17ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCollateralAmount"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_DebtInstrumentCollateralAmount_747d84d6-f089-4b6c-99a6-394db7a17ec0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_b1e2c7f9-f8a1-4d5a-bd82-91245f59303b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_ShortTermBorrowings_b1e2c7f9-f8a1-4d5a-bd82-91245f59303b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebtInstrumentCovenantRatioOfFundedDebtToTotalCapitalization_3664b1af-d440-4659-818c-48637990c99b" xlink:href="swx-20210930.xsd#swx_DebtInstrumentCovenantRatioOfFundedDebtToTotalCapitalization"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_DebtInstrumentCovenantRatioOfFundedDebtToTotalCapitalization_3664b1af-d440-4659-818c-48637990c99b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_448682a0-3b86-49f1-b550-56aafbeead46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_us-gaap_DebtInstrumentTerm_448682a0-3b86-49f1-b550-56aafbeead46" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebtInstrumentBasisSpreadOnVariableRateChangeIntervals_5e92129a-5937-484d-bec9-a0628871ad16" xlink:href="swx-20210930.xsd#swx_DebtInstrumentBasisSpreadOnVariableRateChangeIntervals"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_DebtInstrumentBasisSpreadOnVariableRateChangeIntervals_5e92129a-5937-484d-bec9-a0628871ad16" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebtInstrumentMandatoryPrepaymentAsPercentageOfCashProceedsReceived_2763efb8-0325-4e40-93ff-9de2fcf3d86f" xlink:href="swx-20210930.xsd#swx_DebtInstrumentMandatoryPrepaymentAsPercentageOfCashProceedsReceived"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_DebtInstrumentMandatoryPrepaymentAsPercentageOfCashProceedsReceived_2763efb8-0325-4e40-93ff-9de2fcf3d86f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DebtInstrumentPercentageOfCommittedAmountUnderSpecificAcquisitionFinancings_a092c2c4-c979-431e-963c-5ff331c79eb7" xlink:href="swx-20210930.xsd#swx_DebtInstrumentPercentageOfCommittedAmountUnderSpecificAcquisitionFinancings"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3b710200-9234-448c-bf96-937485f6d2ad" xlink:to="loc_swx_DebtInstrumentPercentageOfCommittedAmountUnderSpecificAcquisitionFinancings_a092c2c4-c979-431e-963c-5ff331c79eb7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncome" xlink:type="simple" xlink:href="swx-20210930.xsd#OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncome"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_c016a55c-208a-49cf-9355-b0f88727287b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_2b63b348-f381-4ef1-ab1e-0201ee1d2588" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_c016a55c-208a-49cf-9355-b0f88727287b" xlink:to="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_2b63b348-f381-4ef1-ab1e-0201ee1d2588" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" xlink:href="swx-20210930.xsd#OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_fbaeca29-80ab-4e17-aa33-6928871d2b99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ScheduleOfRelatedTaxEffectsAllocatedToComponentsOfOtherComprehensiveIncomeLossTableTextBlock_a46f6b5b-5bc1-4309-a06c-e7cf2f61dbe1" xlink:href="swx-20210930.xsd#swx_ScheduleOfRelatedTaxEffectsAllocatedToComponentsOfOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_fbaeca29-80ab-4e17-aa33-6928871d2b99" xlink:to="loc_swx_ScheduleOfRelatedTaxEffectsAllocatedToComponentsOfOtherComprehensiveIncomeLossTableTextBlock_a46f6b5b-5bc1-4309-a06c-e7cf2f61dbe1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_88420c9a-dd9b-4d8d-83b2-789bafbf0ea1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_fbaeca29-80ab-4e17-aa33-6928871d2b99" xlink:to="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_88420c9a-dd9b-4d8d-83b2-789bafbf0ea1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock_4ad1cc1b-d4d0-4fd5-a46f-f85ce127e42f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_fbaeca29-80ab-4e17-aa33-6928871d2b99" xlink:to="loc_us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock_4ad1cc1b-d4d0-4fd5-a46f-f85ce127e42f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeRelatedTaxEffectsAllocatedtoOCIDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeRelatedTaxEffectsAllocatedtoOCIDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeRelatedTaxEffectsAllocatedtoOCIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_b3e93eb3-2548-49f1-8c78-10d5e632094b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5a2b45f4-c0e1-4c2d-9de3-9ca5832535eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_b3e93eb3-2548-49f1-8c78-10d5e632094b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5a2b45f4-c0e1-4c2d-9de3-9ca5832535eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_4e06eaa1-05c4-4aed-be20-9fca7fbee105" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5a2b45f4-c0e1-4c2d-9de3-9ca5832535eb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_4e06eaa1-05c4-4aed-be20-9fca7fbee105" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4e06eaa1-05c4-4aed-be20-9fca7fbee105" xlink:to="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_2142f6e0-ff3e-46fe-bda5-16296d968d75" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_2142f6e0-ff3e-46fe-bda5-16296d968d75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_13e20755-9c36-4362-8893-fca01b0e47ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_13e20755-9c36-4362-8893-fca01b0e47ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AccumulatedDefinedBenefitPlansAdjustmentRegulartoryAdjustmentAttributabletoParentMember_8abedd9a-6559-4b98-9814-716f6c5d01bb" xlink:href="swx-20210930.xsd#swx_AccumulatedDefinedBenefitPlansAdjustmentRegulartoryAdjustmentAttributabletoParentMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:to="loc_swx_AccumulatedDefinedBenefitPlansAdjustmentRegulartoryAdjustmentAttributabletoParentMember_8abedd9a-6559-4b98-9814-716f6c5d01bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AccumulatedDefinedBenefitPlansAdjustmentPriorServiceCostAttributabletoParentMember_c867022d-f342-4a81-bd9b-dc06786bd34e" xlink:href="swx-20210930.xsd#swx_AccumulatedDefinedBenefitPlansAdjustmentPriorServiceCostAttributabletoParentMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:to="loc_swx_AccumulatedDefinedBenefitPlansAdjustmentPriorServiceCostAttributabletoParentMember_c867022d-f342-4a81-bd9b-dc06786bd34e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_f0796aa6-4669-40f3-b389-cddb0c926b20" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_f0796aa6-4669-40f3-b389-cddb0c926b20" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_828a2670-9fcf-4a36-8acd-525b5c427fd2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:to="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_828a2670-9fcf-4a36-8acd-525b5c427fd2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_cf81dbb7-15e7-4826-8e78-2a16a9c6f753" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_6984e644-dd31-4e4a-9775-cc3fd0971661" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_cf81dbb7-15e7-4826-8e78-2a16a9c6f753" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_0bd30e05-5843-4b60-b8e9-dba0bd5a97a5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5a2b45f4-c0e1-4c2d-9de3-9ca5832535eb" xlink:to="loc_dei_LegalEntityAxis_0bd30e05-5843-4b60-b8e9-dba0bd5a97a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_93c44468-a5fa-43c9-9e24-14e970c384bf" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_0bd30e05-5843-4b60-b8e9-dba0bd5a97a5" xlink:to="loc_dei_EntityDomain_93c44468-a5fa-43c9-9e24-14e970c384bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_6a513226-acfe-4771-8ae4-f29f25d0c5c7" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_93c44468-a5fa-43c9-9e24-14e970c384bf" xlink:to="loc_swx_SouthwestGasCorporationMember_6a513226-acfe-4771-8ae4-f29f25d0c5c7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5a2b45f4-c0e1-4c2d-9de3-9ca5832535eb" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_c430a0fc-0c78-4366-a62d-b27b445dd9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_c430a0fc-0c78-4366-a62d-b27b445dd9e4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_fe929d5b-de4b-4c78-8b21-711d41fcb3d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_fe929d5b-de4b-4c78-8b21-711d41fcb3d0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_1abf8c65-f08a-431d-bfbd-3c1dd10f4148" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_1abf8c65-f08a-431d-bfbd-3c1dd10f4148" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_c9de78d1-bbc1-41e9-9881-bdd8595b2fb3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_c9de78d1-bbc1-41e9-9881-bdd8595b2fb3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_6d8a292e-1216-457f-8053-9a06eb799d93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_6d8a292e-1216-457f-8053-9a06eb799d93" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_174b4616-4911-47c9-af69-1fefb346ac3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_174b4616-4911-47c9-af69-1fefb346ac3e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_33107752-e2c5-442d-9814-7eba87c66c70" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_33107752-e2c5-442d-9814-7eba87c66c70" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_cf931846-9fc0-43af-8cd3-06e09daecaec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_cf931846-9fc0-43af-8cd3-06e09daecaec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_85055e8d-e9ff-4db4-940f-f820e2b16319" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_85055e8d-e9ff-4db4-940f-f820e2b16319" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_6a5c6724-ae79-4037-b1de-709b09243e88" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_69fb0e4a-8abc-4602-b64a-3656919de755" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_6a5c6724-ae79-4037-b1de-709b09243e88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAdditionalInformationDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAdditionalInformationDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_1d14a1e8-fca8-4883-ac8f-969773ba9e07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_c4d89aff-4485-4544-96d8-bf11e066ea1a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_1d14a1e8-fca8-4883-ac8f-969773ba9e07" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_c4d89aff-4485-4544-96d8-bf11e066ea1a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAOCIRollforwardDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAOCIRollforwardDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAOCIRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_11a7dfe4-e078-45c3-82b0-c8bf9f9d8735" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7855587f-5176-4fe9-b116-0bf5c3835eb0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_11a7dfe4-e078-45c3-82b0-c8bf9f9d8735" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7855587f-5176-4fe9-b116-0bf5c3835eb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5886b32a-59b4-42b7-a7d1-a1569ec4df68" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7855587f-5176-4fe9-b116-0bf5c3835eb0" xlink:to="loc_dei_LegalEntityAxis_5886b32a-59b4-42b7-a7d1-a1569ec4df68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_f4729685-e1bb-4532-9a4a-9edefb96eea1" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_5886b32a-59b4-42b7-a7d1-a1569ec4df68" xlink:to="loc_dei_EntityDomain_f4729685-e1bb-4532-9a4a-9edefb96eea1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_a88c886b-20f2-4025-a528-bfdcb6e3510f" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_f4729685-e1bb-4532-9a4a-9edefb96eea1" xlink:to="loc_swx_SouthwestGasCorporationMember_a88c886b-20f2-4025-a528-bfdcb6e3510f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_0fb8497c-6a23-45bc-9cde-5d2480cdda81" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7855587f-5176-4fe9-b116-0bf5c3835eb0" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_0fb8497c-6a23-45bc-9cde-5d2480cdda81" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0fb8497c-6a23-45bc-9cde-5d2480cdda81" xlink:to="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_cfe26ef3-b074-4b6b-9a1d-3330a3d37eca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_cfe26ef3-b074-4b6b-9a1d-3330a3d37eca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_f86c7d66-5c7d-4968-9135-7a41ed383df3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_f86c7d66-5c7d-4968-9135-7a41ed383df3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_43e6e743-16ae-4591-b2b7-97570ddbc69a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_43e6e743-16ae-4591-b2b7-97570ddbc69a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AccumulatedDefinedBenefitPlansAdjustmentRegulartoryAdjustmentAttributabletoParentMember_e79ef26e-b7f4-4051-95a9-038b2f7d49e1" xlink:href="swx-20210930.xsd#swx_AccumulatedDefinedBenefitPlansAdjustmentRegulartoryAdjustmentAttributabletoParentMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_swx_AccumulatedDefinedBenefitPlansAdjustmentRegulartoryAdjustmentAttributabletoParentMember_e79ef26e-b7f4-4051-95a9-038b2f7d49e1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_08bb7a7c-7bde-4f16-ace3-88e510e7a237" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_08bb7a7c-7bde-4f16-ace3-88e510e7a237" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_3e4f2c23-491f-473b-90f7-8cebb6859461" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_3e4f2c23-491f-473b-90f7-8cebb6859461" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_b2e565b7-28e6-4072-a5d8-a9083431cec2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_b2e565b7-28e6-4072-a5d8-a9083431cec2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a74ce7a7-e1b5-49a6-8b76-f9f3ee97fa2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_909b5a4f-fab9-426d-b532-630a035e7907" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a74ce7a7-e1b5-49a6-8b76-f9f3ee97fa2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_38e90405-75ed-4835-9767-8ab1c3293f06" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7855587f-5176-4fe9-b116-0bf5c3835eb0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_38e90405-75ed-4835-9767-8ab1c3293f06" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_38e90405-75ed-4835-9767-8ab1c3293f06" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeTax_53698204-f312-4d9b-ad0b-5a4f1113d909" xlink:href="swx-20210930.xsd#swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeTax_53698204-f312-4d9b-ad0b-5a4f1113d909" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestTax_88bfc278-84be-4278-a4d0-4c52d37d46e5" xlink:href="swx-20210930.xsd#swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestTax_88bfc278-84be-4278-a4d0-4c52d37d46e5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_be26730e-2fc1-4259-85ed-f0d28048fbf5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_be26730e-2fc1-4259-85ed-f0d28048fbf5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityAttributableToParentBeforeTax_5f74f9b7-e88e-49d6-92db-232b5f710a44" xlink:href="swx-20210930.xsd#swx_StockholdersEquityAttributableToParentBeforeTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityAttributableToParentBeforeTax_5f74f9b7-e88e-49d6-92db-232b5f710a44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityAttributableToParentTax_e9e6382c-67cc-4b3a-8ce2-17c12008e6ec" xlink:href="swx-20210930.xsd#swx_StockholdersEquityAttributableToParentTax"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityAttributableToParentTax_e9e6382c-67cc-4b3a-8ce2-17c12008e6ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b04164bc-b497-49da-b227-b276ce4e9388" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_StockholdersEquity_b04164bc-b497-49da-b227-b276ce4e9388" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_616c3107-d62e-43c8-aea4-6b1900e57d37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_616c3107-d62e-43c8-aea4-6b1900e57d37" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_fb3ea64d-0923-4591-b016-5bfc9f170e09" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_fb3ea64d-0923-4591-b016-5bfc9f170e09" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_0d799477-bf8b-4580-90e5-1d497787c48d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_0d799477-bf8b-4580-90e5-1d497787c48d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_54332dc6-cee2-4bf0-be87-7eda1f2ef7c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_54332dc6-cee2-4bf0-be87-7eda1f2ef7c2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_a08661f6-fcaa-4b7c-900b-d286a70f98a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_a08661f6-fcaa-4b7c-900b-d286a70f98a8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_86dbae9e-c6fb-4854-ac83-c2ac57d536ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_86dbae9e-c6fb-4854-ac83-c2ac57d536ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_dd2851f4-b0a2-46d5-91f8-970ead79bc2f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_dd2851f4-b0a2-46d5-91f8-970ead79bc2f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3bd56393-084e-47d5-ac95-f7e5645f8d89" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3bd56393-084e-47d5-ac95-f7e5645f8d89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityAttributableToParentBeforeTax_bdac884e-9c7f-46bf-a22b-146331cb7ae0" xlink:href="swx-20210930.xsd#swx_StockholdersEquityAttributableToParentBeforeTax"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityAttributableToParentBeforeTax_bdac884e-9c7f-46bf-a22b-146331cb7ae0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityAttributableToParentTax_28c7fae4-b6d4-4720-965b-3335dd455406" xlink:href="swx-20210930.xsd#swx_StockholdersEquityAttributableToParentTax"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityAttributableToParentTax_28c7fae4-b6d4-4720-965b-3335dd455406" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_4fe9790e-7a46-4215-be09-8aede3abc540" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_StockholdersEquity_4fe9790e-7a46-4215-be09-8aede3abc540" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeTax_c3e239a1-6b9f-49f6-a9d6-387b888d0c12" xlink:href="swx-20210930.xsd#swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeTax"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeTax_c3e239a1-6b9f-49f6-a9d6-387b888d0c12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestTax_f592d5e0-a36a-469c-aac6-7a83972e62bb" xlink:href="swx-20210930.xsd#swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestTax"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_swx_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestTax_f592d5e0-a36a-469c-aac6-7a83972e62bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5d984348-6b45-4747-bac9-c67b2c3ca551" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_2c4e55be-6db2-4720-acc4-ead59c602e47" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5d984348-6b45-4747-bac9-c67b2c3ca551" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_53279276-5e41-43e2-8fde-f46ce0640c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_38e90405-75ed-4835-9767-8ab1c3293f06" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_53279276-5e41-43e2-8fde-f46ce0640c9c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAmountsRecognizedBeforeTaxDefinedBenefitPlansDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAmountsRecognizedBeforeTaxDefinedBenefitPlansDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/OtherComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeAmountsRecognizedBeforeTaxDefinedBenefitPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_9e26a9f3-f029-4ac7-8323-ce96e082636c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_4afad521-290b-450b-a6f5-b186547192a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_9e26a9f3-f029-4ac7-8323-ce96e082636c" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_4afad521-290b-450b-a6f5-b186547192a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_e731fa2e-8274-45f1-9783-75844cc02c4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_9e26a9f3-f029-4ac7-8323-ce96e082636c" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_e731fa2e-8274-45f1-9783-75844cc02c4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAmountRecognizedRegulatoryAssetsBeforeTax_c72947d8-43c1-41fd-bfdf-de90560aac02" xlink:href="swx-20210930.xsd#swx_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAmountRecognizedRegulatoryAssetsBeforeTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_9e26a9f3-f029-4ac7-8323-ce96e082636c" xlink:to="loc_swx_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAmountRecognizedRegulatoryAssetsBeforeTax_c72947d8-43c1-41fd-bfdf-de90560aac02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_3a0e4412-fea8-47e7-a8fb-f383a1648bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_9e26a9f3-f029-4ac7-8323-ce96e082636c" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_3a0e4412-fea8-47e7-a8fb-f383a1648bd6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/SegmentInformation" xlink:type="simple" xlink:href="swx-20210930.xsd#SegmentInformation"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/SegmentInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_2e3c28f6-7d1a-4a89-978e-f229491cbde2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_73d51a17-ff3d-47fc-9785-b4ec2a3e8e75" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_2e3c28f6-7d1a-4a89-978e-f229491cbde2" xlink:to="loc_us-gaap_SegmentReportingDisclosureTextBlock_73d51a17-ff3d-47fc-9785-b4ec2a3e8e75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/SegmentInformationTables" xlink:type="simple" xlink:href="swx-20210930.xsd#SegmentInformationTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/SegmentInformationTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_33931c0d-e632-4714-93d7-285167690aab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_AccountsReceivableForServicesTableTextBlock_b43b1fc9-d508-49b2-bb6d-f88f85812005" xlink:href="swx-20210930.xsd#swx_AccountsReceivableForServicesTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_33931c0d-e632-4714-93d7-285167690aab" xlink:to="loc_swx_AccountsReceivableForServicesTableTextBlock_b43b1fc9-d508-49b2-bb6d-f88f85812005" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_ScheduleOfUtilityInfrastructureServicesAssetsTableTextBlock_3bce8a21-d3e5-4761-8fde-8b45483f62a1" xlink:href="swx-20210930.xsd#swx_ScheduleOfUtilityInfrastructureServicesAssetsTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_33931c0d-e632-4714-93d7-285167690aab" xlink:to="loc_swx_ScheduleOfUtilityInfrastructureServicesAssetsTableTextBlock_3bce8a21-d3e5-4761-8fde-8b45483f62a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_f7682c98-47e6-44e5-97cf-f7417b9e9e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_33931c0d-e632-4714-93d7-285167690aab" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_f7682c98-47e6-44e5-97cf-f7417b9e9e6a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/SegmentInformationNarrativesDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#SegmentInformationNarrativesDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/SegmentInformationNarrativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_87c32447-c873-41b2-a9ee-bc0478197832" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0f473dff-9d99-416c-98b2-189e5eaa029b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_87c32447-c873-41b2-a9ee-bc0478197832" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0f473dff-9d99-416c-98b2-189e5eaa029b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_f7ddfc9f-3325-4f54-b80c-3aaa1c22914b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0f473dff-9d99-416c-98b2-189e5eaa029b" xlink:to="loc_dei_LegalEntityAxis_f7ddfc9f-3325-4f54-b80c-3aaa1c22914b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a46d737d-849c-44a8-86a1-2583944460b5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_f7ddfc9f-3325-4f54-b80c-3aaa1c22914b" xlink:to="loc_dei_EntityDomain_a46d737d-849c-44a8-86a1-2583944460b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_SouthwestGasCorporationMember_7772601c-88c7-4651-a046-b1b8b7386187" xlink:href="swx-20210930.xsd#swx_SouthwestGasCorporationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_a46d737d-849c-44a8-86a1-2583944460b5" xlink:to="loc_swx_SouthwestGasCorporationMember_7772601c-88c7-4651-a046-b1b8b7386187" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_1c073d1c-b569-4e02-a249-e081c033ac84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0f473dff-9d99-416c-98b2-189e5eaa029b" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_1c073d1c-b569-4e02-a249-e081c033ac84" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_13f28e5e-0c68-4154-8539-f3314de5785a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_1c073d1c-b569-4e02-a249-e081c033ac84" xlink:to="loc_us-gaap_NumberOfReportableSegments_13f28e5e-0c68-4154-8539-f3314de5785a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/SegmentInformationAccountsReceivableforServicesDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#SegmentInformationAccountsReceivableforServicesDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/SegmentInformationAccountsReceivableforServicesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_0a7021b3-2435-4398-97b2-6d1f1d9cb4f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_eff80f1c-e88d-4ce6-b7a3-eea89bd56a8e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_0a7021b3-2435-4398-97b2-6d1f1d9cb4f7" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_eff80f1c-e88d-4ce6-b7a3-eea89bd56a8e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_1f436c57-fbad-478a-a01c-6d22756f45f5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_eff80f1c-e88d-4ce6-b7a3-eea89bd56a8e" xlink:to="loc_dei_LegalEntityAxis_1f436c57-fbad-478a-a01c-6d22756f45f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8e1477f5-7d70-4990-a842-f8ce756d956a" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_1f436c57-fbad-478a-a01c-6d22756f45f5" xlink:to="loc_dei_EntityDomain_8e1477f5-7d70-4990-a842-f8ce756d956a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_fec8ee07-a3c0-46c8-9f52-23cefbe64919" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_8e1477f5-7d70-4990-a842-f8ce756d956a" xlink:to="loc_swx_CenturiGroupInc.Member_fec8ee07-a3c0-46c8-9f52-23cefbe64919" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_9fe9c7e8-7b25-4876-a08d-fdda730adfbc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_eff80f1c-e88d-4ce6-b7a3-eea89bd56a8e" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_9fe9c7e8-7b25-4876-a08d-fdda730adfbc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueFromRelatedPartiesCurrent_48d64d3c-4fda-45c8-afaf-8077024c2bb3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DueFromRelatedPartiesCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9fe9c7e8-7b25-4876-a08d-fdda730adfbc" xlink:to="loc_us-gaap_DueFromRelatedPartiesCurrent_48d64d3c-4fda-45c8-afaf-8077024c2bb3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/SegmentInformationUtilityInfrastructureServicesAssetsDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#SegmentInformationUtilityInfrastructureServicesAssetsDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/SegmentInformationUtilityInfrastructureServicesAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_f88b793d-34cf-4c7a-a20b-3db51ca197fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ffe57e7a-70f1-4ceb-9190-49ab7bc3bde5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_f88b793d-34cf-4c7a-a20b-3db51ca197fe" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ffe57e7a-70f1-4ceb-9190-49ab7bc3bde5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a1f160ab-e7c6-463d-ac38-3cbf60031eac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ffe57e7a-70f1-4ceb-9190-49ab7bc3bde5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a1f160ab-e7c6-463d-ac38-3cbf60031eac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9174d941-bf75-41af-bb72-8ca78d4f8429" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a1f160ab-e7c6-463d-ac38-3cbf60031eac" xlink:to="loc_us-gaap_SegmentDomain_9174d941-bf75-41af-bb72-8ca78d4f8429" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_UtilityInfrastructureServicesSegmentMember_f96542f5-3b72-465f-b61c-0bff6e6d504b" xlink:href="swx-20210930.xsd#swx_UtilityInfrastructureServicesSegmentMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_9174d941-bf75-41af-bb72-8ca78d4f8429" xlink:to="loc_swx_UtilityInfrastructureServicesSegmentMember_f96542f5-3b72-465f-b61c-0bff6e6d504b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5de5f738-c417-46eb-8cba-4b51725a65f5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ffe57e7a-70f1-4ceb-9190-49ab7bc3bde5" xlink:to="loc_dei_LegalEntityAxis_5de5f738-c417-46eb-8cba-4b51725a65f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019a7d93-2b26-4db9-8ce9-c252cbe6ecaa" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_5de5f738-c417-46eb-8cba-4b51725a65f5" xlink:to="loc_dei_EntityDomain_019a7d93-2b26-4db9-8ce9-c252cbe6ecaa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_e1f9d078-1dcb-4d61-8933-9b981f9b35de" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_019a7d93-2b26-4db9-8ce9-c252cbe6ecaa" xlink:to="loc_swx_CenturiGroupInc.Member_e1f9d078-1dcb-4d61-8933-9b981f9b35de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_29cef9d2-0e2a-41b4-93e5-fb99914e0a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ffe57e7a-70f1-4ceb-9190-49ab7bc3bde5" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_29cef9d2-0e2a-41b4-93e5-fb99914e0a5e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_38c2a993-263c-4fcd-b149-ef8b87eabe54" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_29cef9d2-0e2a-41b4-93e5-fb99914e0a5e" xlink:to="loc_us-gaap_Assets_38c2a993-263c-4fcd-b149-ef8b87eabe54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/SegmentInformationScheduleofReportingInformationDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#SegmentInformationScheduleofReportingInformationDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/SegmentInformationScheduleofReportingInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_270d84a7-050d-43c8-a05d-a75c0a60eaaa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_17400cfd-396d-4c7a-a39d-5cd59b85e561" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_270d84a7-050d-43c8-a05d-a75c0a60eaaa" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_17400cfd-396d-4c7a-a39d-5cd59b85e561" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_25745839-a3b2-40b4-8cd4-c78dae15c477" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_17400cfd-396d-4c7a-a39d-5cd59b85e561" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_25745839-a3b2-40b4-8cd4-c78dae15c477" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b9039a07-7001-4a74-936a-91563d43304b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_25745839-a3b2-40b4-8cd4-c78dae15c477" xlink:to="loc_us-gaap_SegmentDomain_b9039a07-7001-4a74-936a-91563d43304b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_NaturalGasOperationsMember_1e042101-7f56-45aa-b9e5-b9862c3b1053" xlink:href="swx-20210930.xsd#swx_NaturalGasOperationsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_b9039a07-7001-4a74-936a-91563d43304b" xlink:to="loc_swx_NaturalGasOperationsMember_1e042101-7f56-45aa-b9e5-b9862c3b1053" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_UtilityInfrastructureServicesSegmentMember_3de631a7-904d-4beb-af79-6f427dcfdb88" xlink:href="swx-20210930.xsd#swx_UtilityInfrastructureServicesSegmentMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_b9039a07-7001-4a74-936a-91563d43304b" xlink:to="loc_swx_UtilityInfrastructureServicesSegmentMember_3de631a7-904d-4beb-af79-6f427dcfdb88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_e9a766a6-7785-434c-97e2-2485d2d9f42b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_17400cfd-396d-4c7a-a39d-5cd59b85e561" xlink:to="loc_srt_ConsolidationItemsAxis_e9a766a6-7785-434c-97e2-2485d2d9f42b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a56a71fb-d01a-49ea-a44e-3f155f1e9d30" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_e9a766a6-7785-434c-97e2-2485d2d9f42b" xlink:to="loc_srt_ConsolidationItemsDomain_a56a71fb-d01a-49ea-a44e-3f155f1e9d30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_ce0efb5c-12c0-4cda-876b-6a31df0cac8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_a56a71fb-d01a-49ea-a44e-3f155f1e9d30" xlink:to="loc_us-gaap_OperatingSegmentsMember_ce0efb5c-12c0-4cda-876b-6a31df0cac8c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_6547b894-437f-47fa-bd54-36a845743622" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_a56a71fb-d01a-49ea-a44e-3f155f1e9d30" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_6547b894-437f-47fa-bd54-36a845743622" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_ecde5672-f043-45c4-897e-ac74ae61c86b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_17400cfd-396d-4c7a-a39d-5cd59b85e561" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_ecde5672-f043-45c4-897e-ac74ae61c86b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_c423b5e8-91da-46ea-8e0b-c1fda66a80d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_ecde5672-f043-45c4-897e-ac74ae61c86b" xlink:to="loc_us-gaap_Revenues_c423b5e8-91da-46ea-8e0b-c1fda66a80d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_effaadfc-68cd-4079-b855-852ebb60ecbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_ecde5672-f043-45c4-897e-ac74ae61c86b" xlink:to="loc_us-gaap_NetIncomeLoss_effaadfc-68cd-4079-b855-852ebb60ecbb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BusinessAcquisitions" xlink:type="simple" xlink:href="swx-20210930.xsd#BusinessAcquisitions"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BusinessAcquisitions" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_9d050712-3eb6-486f-adb8-69484ab28394" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAndAssetAcquisitionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationDisclosureTextBlock_4d69f15b-7fe6-4b73-9ba0-94849a99c04e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_9d050712-3eb6-486f-adb8-69484ab28394" xlink:to="loc_us-gaap_BusinessCombinationDisclosureTextBlock_4d69f15b-7fe6-4b73-9ba0-94849a99c04e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BusinessAcquisitionsTables" xlink:type="simple" xlink:href="swx-20210930.xsd#BusinessAcquisitionsTables"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BusinessAcquisitionsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_d7815a57-2b8b-46ed-a769-12bd0c78aa30" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAndAssetAcquisitionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_09ad8b21-ac8e-45ba-abf6-63f390c54c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_d7815a57-2b8b-46ed-a769-12bd0c78aa30" xlink:to="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_09ad8b21-ac8e-45ba-abf6-63f390c54c0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTextBlock_a83b9d15-2a25-4760-b94f-0c080eb6e2f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_d7815a57-2b8b-46ed-a769-12bd0c78aa30" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTextBlock_a83b9d15-2a25-4760-b94f-0c080eb6e2f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26c46160-ec28-45bd-a2c0-7e9f81468935" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_d7815a57-2b8b-46ed-a769-12bd0c78aa30" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26c46160-ec28-45bd-a2c0-7e9f81468935" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BusinessAcquisitionsNarrativeDetail" xlink:type="simple" xlink:href="swx-20210930.xsd#BusinessAcquisitionsNarrativeDetail"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BusinessAcquisitionsNarrativeDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_07f1ed92-f204-43a8-9ff8-68b2d793a66b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAndAssetAcquisitionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9dfda78f-4325-4e5f-8e2f-42dd8ea0a784" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_07f1ed92-f204-43a8-9ff8-68b2d793a66b" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9dfda78f-4325-4e5f-8e2f-42dd8ea0a784" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_c73023ab-8d4c-447b-8d09-e68dea81667e" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9dfda78f-4325-4e5f-8e2f-42dd8ea0a784" xlink:to="loc_dei_LegalEntityAxis_c73023ab-8d4c-447b-8d09-e68dea81667e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3f35fd89-1797-4d08-a764-c86548c356ca" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_c73023ab-8d4c-447b-8d09-e68dea81667e" xlink:to="loc_dei_EntityDomain_3f35fd89-1797-4d08-a764-c86548c356ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_CenturiGroupInc.Member_f57f9d22-8c9f-4c1b-921a-e5dc16d1f1b9" xlink:href="swx-20210930.xsd#swx_CenturiGroupInc.Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_3f35fd89-1797-4d08-a764-c86548c356ca" xlink:to="loc_swx_CenturiGroupInc.Member_f57f9d22-8c9f-4c1b-921a-e5dc16d1f1b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_82e3de94-3f85-40aa-98fa-39e43f8d85ca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9dfda78f-4325-4e5f-8e2f-42dd8ea0a784" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_82e3de94-3f85-40aa-98fa-39e43f8d85ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cec66db1-c00d-40db-b6ad-870689dab45e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_82e3de94-3f85-40aa-98fa-39e43f8d85ca" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cec66db1-c00d-40db-b6ad-870689dab45e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DrumParentIncMember_44623055-427d-461a-bdf7-97d0fbc91521" xlink:href="swx-20210930.xsd#swx_DrumParentIncMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cec66db1-c00d-40db-b6ad-870689dab45e" xlink:to="loc_swx_DrumParentIncMember_44623055-427d-461a-bdf7-97d0fbc91521" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9dfda78f-4325-4e5f-8e2f-42dd8ea0a784" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_9a49bac5-3d88-4375-8d7f-e1f37dc541c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_9a49bac5-3d88-4375-8d7f-e1f37dc541c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_416d7ee6-2030-4355-b857-0e2234b5060c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_416d7ee6-2030-4355-b857-0e2234b5060c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_6a7f8136-51b8-4551-97e2-d0091948b335" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_6a7f8136-51b8-4551-97e2-d0091948b335" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_1d11833e-d9fd-4b4c-96f3-d84ef5a20e7f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_1d11833e-d9fd-4b4c-96f3-d84ef5a20e7f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_d6ab727a-19f1-457b-a414-12d3e8e3361a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_d6ab727a-19f1-457b-a414-12d3e8e3361a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_ebfe70e2-56bd-4c49-8f53-79ffdd6da6d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0e11a376-02b9-4462-818a-037df67e123b" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_ebfe70e2-56bd-4c49-8f53-79ffdd6da6d1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BusinessAcquisitionsSummaryofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetail" xlink:type="simple" xlink:href="swx-20210930.xsd#BusinessAcquisitionsSummaryofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetail"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BusinessAcquisitionsSummaryofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_e5726664-8367-4e23-81a7-d840bd871209" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAndAssetAcquisitionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c3e93715-fdb3-4bcc-82a4-eaada0b00f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_e5726664-8367-4e23-81a7-d840bd871209" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c3e93715-fdb3-4bcc-82a4-eaada0b00f8b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f4c22048-e653-45a0-9080-5ed7bbc54c10" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c3e93715-fdb3-4bcc-82a4-eaada0b00f8b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f4c22048-e653-45a0-9080-5ed7bbc54c10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0393279b-2521-437f-b19e-9d3a23f612d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f4c22048-e653-45a0-9080-5ed7bbc54c10" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0393279b-2521-437f-b19e-9d3a23f612d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DrumParentIncMember_4a79b4e4-60dd-407f-accc-5c454fe6a4f0" xlink:href="swx-20210930.xsd#swx_DrumParentIncMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0393279b-2521-437f-b19e-9d3a23f612d9" xlink:to="loc_swx_DrumParentIncMember_4a79b4e4-60dd-407f-accc-5c454fe6a4f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_14248b01-c99b-4869-aa9a-0eca950346f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c3e93715-fdb3-4bcc-82a4-eaada0b00f8b" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_14248b01-c99b-4869-aa9a-0eca950346f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_14248b01-c99b-4869-aa9a-0eca950346f3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b21e8e39-8d52-49ce-8b0f-73c5f4c5f428" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b21e8e39-8d52-49ce-8b0f-73c5f4c5f428" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_df290636-65fb-40eb-8c01-4e8006422b00" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_df290636-65fb-40eb-8c01-4e8006422b00" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssets_3e9a8031-2c0f-4e35-bc05-45f69121cadd" xlink:href="swx-20210930.xsd#swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssets"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssets_3e9a8031-2c0f-4e35-bc05-45f69121cadd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxesReceivableNet_97c1247a-a6f1-4b09-ada5-1d79b55136ea" xlink:href="swx-20210930.xsd#swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxesReceivableNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxesReceivableNet_97c1247a-a6f1-4b09-ada5-1d79b55136ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssetsUnderOperatingLeases_09c9c77f-46d4-4ac5-9301-ddd715224d1a" xlink:href="swx-20210930.xsd#swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssetsUnderOperatingLeases"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssetsUnderOperatingLeases_09c9c77f-46d4-4ac5-9301-ddd715224d1a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_1dfdc574-7249-4539-b613-f415b32b9694" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_1dfdc574-7249-4539-b613-f415b32b9694" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_e4ebc7d4-3c2e-4967-85c6-3ec18070a1be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_e4ebc7d4-3c2e-4967-85c6-3ec18070a1be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_c5537602-0fa9-4533-adcc-388cc4168c7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_c5537602-0fa9-4533-adcc-388cc4168c7e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_5dc1d697-8209-4e86-adba-f3cf7f35b4e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_Goodwill_5dc1d697-8209-4e86-adba-f3cf7f35b4e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill_d79e3a72-4bbe-4b8c-9be3-2cbbaa632489" xlink:href="swx-20210930.xsd#swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill_d79e3a72-4bbe-4b8c-9be3-2cbbaa632489" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_ce6dca80-88cb-47e6-becb-597c155616f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_ce6dca80-88cb-47e6-becb-597c155616f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseObligations_0259a85e-2aba-4875-9359-598cf4e0aaff" xlink:href="swx-20210930.xsd#swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseObligations"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseObligations_0259a85e-2aba-4875-9359-598cf4e0aaff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractLiabilities_619770c1-9402-4e75-a619-cf9a5872fd6f" xlink:href="swx-20210930.xsd#swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractLiabilities"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractLiabilities_619770c1-9402-4e75-a619-cf9a5872fd6f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseObligations_7f5d05b0-a64c-422d-8c02-c127819e016e" xlink:href="swx-20210930.xsd#swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseObligations"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_swx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseObligations_7f5d05b0-a64c-422d-8c02-c127819e016e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_8c2a9ab7-f445-4046-a711-d2349746eb3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_8c2a9ab7-f445-4046-a711-d2349746eb3e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_21f2a81c-99b9-4d60-933a-7d7678c7edaf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_21f2a81c-99b9-4d60-933a-7d7678c7edaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_fbe5de31-212e-476d-8c93-a6257d642f7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_fbe5de31-212e-476d-8c93-a6257d642f7e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_11a82c00-c5e6-40f3-a134-ddaf3ce6f0be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_5b269a42-7fa4-4406-b010-a0c56de017e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_11a82c00-c5e6-40f3-a134-ddaf3ce6f0be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BusinessAcquisitionsMajorClassesofIntangibleAssetsAcquiredDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BusinessAcquisitionsMajorClassesofIntangibleAssetsAcquiredDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BusinessAcquisitionsMajorClassesofIntangibleAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_e21edaff-8cb3-4a41-ac34-e02d62cb77c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAndAssetAcquisitionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_8b69a395-b772-40ed-b098-e9ad659a6991" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_e21edaff-8cb3-4a41-ac34-e02d62cb77c1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_8b69a395-b772-40ed-b098-e9ad659a6991" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f83d916f-53d7-46a3-b959-884d4ba13b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_8b69a395-b772-40ed-b098-e9ad659a6991" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f83d916f-53d7-46a3-b959-884d4ba13b2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5f450b89-ce3b-41a6-ba7a-550986fb82f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f83d916f-53d7-46a3-b959-884d4ba13b2b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5f450b89-ce3b-41a6-ba7a-550986fb82f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DrumParentIncMember_7cf18c0e-c677-4eb0-a27c-3a5e3e16ca77" xlink:href="swx-20210930.xsd#swx_DrumParentIncMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5f450b89-ce3b-41a6-ba7a-550986fb82f4" xlink:to="loc_swx_DrumParentIncMember_7cf18c0e-c677-4eb0-a27c-3a5e3e16ca77" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3610043b-8356-43e8-a31e-a6a6a37be413" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_8b69a395-b772-40ed-b098-e9ad659a6991" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3610043b-8356-43e8-a31e-a6a6a37be413" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_910cdaef-99fe-489d-8098-12e4d9dbb961" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3610043b-8356-43e8-a31e-a6a6a37be413" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_910cdaef-99fe-489d-8098-12e4d9dbb961" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrderOrProductionBacklogMember_306beab1-4187-4ecc-873a-9646fc2347ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrderOrProductionBacklogMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_910cdaef-99fe-489d-8098-12e4d9dbb961" xlink:to="loc_us-gaap_OrderOrProductionBacklogMember_306beab1-4187-4ecc-873a-9646fc2347ce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_429e425d-b65b-4840-b9e7-a55441e3519e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_910cdaef-99fe-489d-8098-12e4d9dbb961" xlink:to="loc_us-gaap_TradeNamesMember_429e425d-b65b-4840-b9e7-a55441e3519e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_63e6fc5d-1a8c-4ba0-bf2a-7ea35b570090" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_910cdaef-99fe-489d-8098-12e4d9dbb961" xlink:to="loc_us-gaap_CustomerRelationshipsMember_63e6fc5d-1a8c-4ba0-bf2a-7ea35b570090" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_642c51da-5a12-4fe6-bde1-7f56ba4f491e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_8b69a395-b772-40ed-b098-e9ad659a6991" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_642c51da-5a12-4fe6-bde1-7f56ba4f491e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_c5a07237-e781-4107-9819-d4a204918bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_642c51da-5a12-4fe6-bde1-7f56ba4f491e" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_c5a07237-e781-4107-9819-d4a204918bcd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_b60b6111-ef47-4f56-a53a-8fa68db0cf2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_642c51da-5a12-4fe6-bde1-7f56ba4f491e" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_b60b6111-ef47-4f56-a53a-8fa68db0cf2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BusinessAcquisitionsScheduleofProFormaConsolidatedFinancialInformationDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BusinessAcquisitionsScheduleofProFormaConsolidatedFinancialInformationDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BusinessAcquisitionsScheduleofProFormaConsolidatedFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_189b5fe1-18b8-4406-90f2-60d475424eba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAndAssetAcquisitionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_55852b64-c4ef-4287-94f7-2563efa6c70c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_189b5fe1-18b8-4406-90f2-60d475424eba" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_55852b64-c4ef-4287-94f7-2563efa6c70c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_69ecbd77-c0f2-427c-8fef-56ecd3cb569d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_55852b64-c4ef-4287-94f7-2563efa6c70c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_69ecbd77-c0f2-427c-8fef-56ecd3cb569d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d325a7c0-fb83-42f5-82ee-2a66c0c5a732" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_69ecbd77-c0f2-427c-8fef-56ecd3cb569d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d325a7c0-fb83-42f5-82ee-2a66c0c5a732" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DrumParentIncMember_2105b982-d547-45f0-81cd-e75346a5fa1c" xlink:href="swx-20210930.xsd#swx_DrumParentIncMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d325a7c0-fb83-42f5-82ee-2a66c0c5a732" xlink:to="loc_swx_DrumParentIncMember_2105b982-d547-45f0-81cd-e75346a5fa1c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_55852b64-c4ef-4287-94f7-2563efa6c70c" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessAcquisitionProFormaAdjustmentTransactionCosts_e788f8a3-6242-4bf9-87ff-c564b925ccf5" xlink:href="swx-20210930.xsd#swx_BusinessAcquisitionProFormaAdjustmentTransactionCosts"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:to="loc_swx_BusinessAcquisitionProFormaAdjustmentTransactionCosts_e788f8a3-6242-4bf9-87ff-c564b925ccf5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_BusinessAcquisitionProFormaAdjustmentIncrementalInterestExpenseOfNewLoanFacility_d71a8d7c-38e1-4687-afdd-6bdbed860f02" xlink:href="swx-20210930.xsd#swx_BusinessAcquisitionProFormaAdjustmentIncrementalInterestExpenseOfNewLoanFacility"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:to="loc_swx_BusinessAcquisitionProFormaAdjustmentIncrementalInterestExpenseOfNewLoanFacility_d71a8d7c-38e1-4687-afdd-6bdbed860f02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_1c210be1-6679-4c6f-ad82-c115997b15bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_1c210be1-6679-4c6f-ad82-c115997b15bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_9af94b40-2c37-4a97-a605-249eeaeeda83" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_9af94b40-2c37-4a97-a605-249eeaeeda83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_0be505b0-f8de-45c5-baa3-b169dde1678c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_0be505b0-f8de-45c5-baa3-b169dde1678c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_3b65d8f2-1672-425d-9a5d-10226d30251b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89dc780f-5917-44af-865c-e59ae9465980" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_3b65d8f2-1672-425d-9a5d-10226d30251b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.swgas.com/role/BusinessAcquisitionsScheduleofActualResultsfromOperationsforAcquireeDetails" xlink:type="simple" xlink:href="swx-20210930.xsd#BusinessAcquisitionsScheduleofActualResultsfromOperationsforAcquireeDetails"/>
  <link:presentationLink xlink:role="http://www.swgas.com/role/BusinessAcquisitionsScheduleofActualResultsfromOperationsforAcquireeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_6c755f77-b941-4f03-abd1-d5e3b0859c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAndAssetAcquisitionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_7ef369e6-d910-43cb-a5fe-808b98ff9337" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract_6c755f77-b941-4f03-abd1-d5e3b0859c8f" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_7ef369e6-d910-43cb-a5fe-808b98ff9337" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_0ffa6d45-ddfb-46cc-9d85-df3266ab66c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_7ef369e6-d910-43cb-a5fe-808b98ff9337" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_0ffa6d45-ddfb-46cc-9d85-df3266ab66c2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e5c8bafc-360e-4341-99a5-296bc9bcc108" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0ffa6d45-ddfb-46cc-9d85-df3266ab66c2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e5c8bafc-360e-4341-99a5-296bc9bcc108" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_swx_DrumParentIncMember_3872a08c-de94-433d-add2-f7a0228d7e61" xlink:href="swx-20210930.xsd#swx_DrumParentIncMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e5c8bafc-360e-4341-99a5-296bc9bcc108" xlink:to="loc_swx_DrumParentIncMember_3872a08c-de94-433d-add2-f7a0228d7e61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_f21c1ee5-de23-4c45-b971-1569d1347f7f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_7ef369e6-d910-43cb-a5fe-808b98ff9337" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_f21c1ee5-de23-4c45-b971-1569d1347f7f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_eef8d65b-43d9-4535-8359-57c7a7c591c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f21c1ee5-de23-4c45-b971-1569d1347f7f" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_eef8d65b-43d9-4535-8359-57c7a7c591c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_f37c397e-4aaf-4c20-8d8a-64847259542e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f21c1ee5-de23-4c45-b971-1569d1347f7f" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_f37c397e-4aaf-4c20-8d8a-64847259542e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
