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<!--  EDGAR Online I-Metrix Xcelerate Taxonomy Definition Linkbase, based on XBRL 2.1  http://www.edgar-online.com/  -->
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<!--  Round: 42e9a9d3-833c-4fed-b88e-68b34df0b7df -->
<!--  Creation date: 2010-11-08T20:48:45Z -->
<!--  Copyright (c) 2005-2010 EDGAR Online, Inc. All Rights Reserved. -->
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    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="100.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="swx_ShareholdersEquityAndComprehensiveIncomeTextBlock" order="1.0200" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="dei_LegalEntityAxis" order="1.0000" priority="2" use="optional"/>
  </definitionLink>
</linkbase>
</XBRL>
