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  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2026"
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    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2026/ffd-2026.xsd"
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    <context id="rc">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001004155</identifier>
        </entity>
        <period>
            <startDate>2026-09-09</startDate>
            <endDate>2026-09-09</endDate>
        </period>
    </context>
    <context id="offrl_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001004155</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
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        <period>
            <startDate>2026-09-09</startDate>
            <endDate>2026-09-09</endDate>
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    <context id="offrl_2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001004155</identifier>
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                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>2</dei:lineNo>
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        </entity>
        <period>
            <startDate>2026-09-09</startDate>
            <endDate>2026-09-09</endDate>
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    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <ffd:FormTp contextRef="rc" id="ixv-368">S-3</ffd:FormTp>
    <ffd:SubmissnTp contextRef="rc" id="ixv-369">424B2</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="rc" id="ixv-370">EX-FILING FEES</ffd:FeeExhibitTp>
    <ffd:RegnFileNb contextRef="rc" id="ixv-371">333-285115</ffd:RegnFileNb>
    <dei:EntityCentralIndexKey contextRef="rc" id="ixv-372">0001004155</dei:EntityCentralIndexKey>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-373">SOUTHERN CO GAS</dei:EntityRegistrantName>
    <ffd:OfferingTableNa contextRef="rc" id="hiddenrcOfferingTableNa" xsi:nil="true"/>
    <ffd:OffsetTableNa contextRef="rc" id="hiddenrcOffsetTableNa">N/A</ffd:OffsetTableNa>
    <ffd:CombinedProspectusTableNa contextRef="rc" id="hiddenrcCombinedProspectusTableNa">N/A</ffd:CombinedProspectusTableNa>
    <ffd:FormTp contextRef="rc" id="ixv-410">S-3</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-411">SOUTHERN CO GAS</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="offrl_1" id="ixv-412">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_1" id="ixv-413">Debt</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_1" id="ixv-414">Series 2026A 5.00% Senior Notes due October 1, 2029 of Southern Company Gas Capital Corporation</ffd:OfferingSctyTitl>
    <ffd:Rule457rFlg contextRef="offrl_1" id="ixv-415">true</ffd:Rule457rFlg>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_1"
      decimals="2"
      id="ixv-416"
      unitRef="USD">549642500.00</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="offrl_1"
      decimals="7"
      id="ixv-417"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_1"
      decimals="2"
      id="ixv-418"
      unitRef="USD">75905.63</ffd:FeeAmt>
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    <ffd:OfferingSctyTp contextRef="offrl_2" id="ixv-420">Other</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_2" id="ixv-421">Guarantee of Series 2026A 5.00% Senior Notes due October 1, 2029 of Southern Company Gas Capital Corporation by Southern Company Gas</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_2" id="ixv-422">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_2"
      decimals="7"
      id="ixv-423"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_2"
      decimals="2"
      id="ixv-424"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:TtlOfferingAmt contextRef="rc" decimals="2" id="ixv-425" unitRef="USD">549642500.00</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt contextRef="rc" decimals="2" id="ixv-426" unitRef="USD">75905.63</ffd:TtlFeeAmt>
    <ffd:TtlPrevslyPdAmt contextRef="rc" decimals="2" id="ixv-427" unitRef="USD">0.00</ffd:TtlPrevslyPdAmt>
    <ffd:TtlOffsetAmt contextRef="rc" decimals="2" id="ixv-428" unitRef="USD">0.00</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt contextRef="rc" decimals="2" id="ixv-429" unitRef="USD">75905.63</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="offrl_1" id="ixv-430">This "Calculation of Filing Fee Tables" shall be deemed to update the "Calculation of Filing Fee Tables" in Southern Company Gas' and Southern Company Gas Capital Corporation's Registration Statement on Form S-3 (File No. 333-285115) in accordance with Rules 456(b) and 457(r) under the Securities Act of 1933, as amended (the "Securities Act"). Southern Company Gas has provided a guarantee with respect to the Series 2026A 5.00% Senior Notes due October 1, 2029 issued by Southern Company Gas Capital Corporation.</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_2" id="ixv-431">No separate consideration will be received for the Guarantee of Series 2026A 5.00% Senior Notes due October 1, 2029 by Southern Company Gas, and, pursuant to Rule 457(n) under the Securities Act, no registration fee is required with respect to such guarantee.</ffd:OfferingNote>
    <ffd:NrrtvMaxAggtOfferingPric contextRef="rc" decimals="2" id="ixv-432" unitRef="USD">549642500.00</ffd:NrrtvMaxAggtOfferingPric>
    <ffd:FnlPrspctsFlg contextRef="rc" id="ixv-433">true</ffd:FnlPrspctsFlg>
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