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    <link:label id="lab_us-gaap_RedeemablePreferredStockMember_903A8C3B835DCB26AA1583E47EAE83E9_label_en-US" xlink:label="lab_us-gaap_RedeemablePreferredStockMember_903A8C3B835DCB26AA1583E47EAE83E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Redeemable Preferred Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RedeemablePreferredStockMember" xlink:label="loc_us-gaap_RedeemablePreferredStockMember_903A8C3B835DCB26AA1583E47EAE83E9" xlink:type="locator" />
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    <link:label id="lab_lnt_RedeemablePreferredStockByDividendRateAxis_E998B50AAB0A0FFFD95983E47EAEEA64_terseLabel_en-US" xlink:label="lab_lnt_RedeemablePreferredStockByDividendRateAxis_E998B50AAB0A0FFFD95983E47EAEEA64" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redeemable Preferred Stock, by Dividend Rate [Axis]</link:label>
    <link:label id="lab_lnt_RedeemablePreferredStockByDividendRateAxis_E998B50AAB0A0FFFD95983E47EAEEA64_label_en-US" xlink:label="lab_lnt_RedeemablePreferredStockByDividendRateAxis_E998B50AAB0A0FFFD95983E47EAEEA64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Redeemable Preferred Stock, by Dividend Rate [Axis]</link:label>
    <link:label id="lab_lnt_RedeemablePreferredStockByDividendRateAxis_E998B50AAB0A0FFFD95983E47EAEEA64_documentation_en-US" xlink:label="lab_lnt_RedeemablePreferredStockByDividendRateAxis_E998B50AAB0A0FFFD95983E47EAEEA64" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Redeemable Preferred Stock, by Dividend Rate [Axis]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_RedeemablePreferredStockByDividendRateAxis" xlink:label="loc_lnt_RedeemablePreferredStockByDividendRateAxis_E998B50AAB0A0FFFD95983E47EAEEA64" xlink:type="locator" />
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    <link:label id="lab_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A_terseLabel_en-US" xlink:label="lab_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redeemable Preferred Stock, by Dividend Rate [Domain]</link:label>
    <link:label id="lab_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A_label_en-US" xlink:label="lab_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Redeemable Preferred Stock, by Dividend Rate [Domain]</link:label>
    <link:label id="lab_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A_documentation_en-US" xlink:label="lab_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Domain] for Redeemable Preferred Stock, by Dividend Rate [Axis]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_RedeemablePreferredStockByDividendRateDomain" xlink:label="loc_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A" xlink:to="lab_lnt_RedeemablePreferredStockByDividendRateDomain_AD141D5F786E5AA39F9083E47EAECD6A" xlink:type="arc" />
    <link:label id="lab_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE_terseLabel_en-US" xlink:label="lab_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.1% [Member]</link:label>
    <link:label id="lab_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE_label_en-US" xlink:label="lab_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point One Percentage [Member]</link:label>
    <link:label id="lab_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE_documentation_en-US" xlink:label="lab_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Point One Percentage [Member]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_FivePointOnePercentageMember" xlink:label="loc_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE" xlink:to="lab_lnt_FivePointOnePercentageMember_D25FC6FCC3A687F9371983E47EAED2FE" xlink:type="arc" />
    <link:label id="lab_lnt_EightPointThreeSevenFivePercentageMember_11E60650B0E67C8189F483E47EAE4E3D_terseLabel_en-US" xlink:label="lab_lnt_EightPointThreeSevenFivePercentageMember_11E60650B0E67C8189F483E47EAE4E3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8.375% [Member]</link:label>
    <link:label id="lab_lnt_EightPointThreeSevenFivePercentageMember_11E60650B0E67C8189F483E47EAE4E3D_label_en-US" xlink:label="lab_lnt_EightPointThreeSevenFivePercentageMember_11E60650B0E67C8189F483E47EAE4E3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Point Three Seven Five Percentage [Member]</link:label>
    <link:label id="lab_lnt_EightPointThreeSevenFivePercentageMember_11E60650B0E67C8189F483E47EAE4E3D_documentation_en-US" xlink:label="lab_lnt_EightPointThreeSevenFivePercentageMember_11E60650B0E67C8189F483E47EAE4E3D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Point Three Seven Five Percentage [Member]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_EightPointThreeSevenFivePercentageMember" xlink:label="loc_lnt_EightPointThreeSevenFivePercentageMember_11E60650B0E67C8189F483E47EAE4E3D" xlink:type="locator" />
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    <link:label id="lab_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899_terseLabel_en-US" xlink:label="lab_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.40% [Member]</link:label>
    <link:label id="lab_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899_label_en-US" xlink:label="lab_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Point Four Zero Percent [Member]</link:label>
    <link:label id="lab_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899_documentation_en-US" xlink:label="lab_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Point Four Zero Percent [Member]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_FourPointFourZeroPercentMember" xlink:label="loc_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899" xlink:to="lab_lnt_FourPointFourZeroPercentMember_B98682435F20BF538F6183E47EAE4899" xlink:type="arc" />
    <link:label id="lab_lnt_SixPointFiveZeroPercentMember_2B6DE35540E1BE9B7DB983E47EAE5698_terseLabel_en-US" xlink:label="lab_lnt_SixPointFiveZeroPercentMember_2B6DE35540E1BE9B7DB983E47EAE5698" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.50% [Member]</link:label>
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    <link:label id="lab_lnt_SixPointFiveZeroPercentMember_2B6DE35540E1BE9B7DB983E47EAE5698_documentation_en-US" xlink:label="lab_lnt_SixPointFiveZeroPercentMember_2B6DE35540E1BE9B7DB983E47EAE5698" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Point Five Zero Percent [Member]</link:label>
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    <link:label id="lab_lnt_FourPointFourZeroPercentThroughSixPointFiveZeroPercentMember_0217A325EB16DD1CC17983E47EAE812F_terseLabel_en-US" xlink:label="lab_lnt_FourPointFourZeroPercentThroughSixPointFiveZeroPercentMember_0217A325EB16DD1CC17983E47EAE812F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.40% through 6.50% [Member]</link:label>
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    <link:label id="lab_lnt_FourPointFourZeroPercentThroughSixPointFiveZeroPercentMember_0217A325EB16DD1CC17983E47EAE812F_documentation_en-US" xlink:label="lab_lnt_FourPointFourZeroPercentThroughSixPointFiveZeroPercentMember_0217A325EB16DD1CC17983E47EAE812F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Point Four Zero Percent through Six Point Five Zero Percent [Member]</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleAndCollectionOfReceivables_9745187CBE0FFF13F9FD83E47DE382FC_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndCollectionOfReceivables_9745187CBE0FFF13F9FD83E47DE382FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale and Collection of Receivables</link:label>
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    <link:label id="lab_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541_terseLabel_en-US" xlink:label="lab_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Costs incurred</link:label>
    <link:label id="lab_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541_label_en-US" xlink:label="lab_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost Incurred on Sale of Receivables</link:label>
    <link:label id="lab_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541_documentation_en-US" xlink:label="lab_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cost Incurred on Sale of Receivables</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541" xlink:to="lab_lnt_CostIncurredOnSaleOfReceivables_C6A79C4E4B35709CA19183E47DE3D541" xlink:type="arc" />
    <link:label id="lab_lnt_CommonStockOustandingRollForward_9329B3E8ABD33DA5A8931996AA3F22D0_terseLabel_en-US" xlink:label="lab_lnt_CommonStockOustandingRollForward_9329B3E8ABD33DA5A8931996AA3F22D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock Oustanding [Roll Forward]</link:label>
    <link:label id="lab_lnt_CommonStockOustandingRollForward_9329B3E8ABD33DA5A8931996AA3F22D0_label_en-US" xlink:label="lab_lnt_CommonStockOustandingRollForward_9329B3E8ABD33DA5A8931996AA3F22D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock Oustanding [Roll Forward]</link:label>
    <link:label id="lab_lnt_CommonStockOustandingRollForward_9329B3E8ABD33DA5A8931996AA3F22D0_documentation_en-US" xlink:label="lab_lnt_CommonStockOustandingRollForward_9329B3E8ABD33DA5A8931996AA3F22D0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Common Stock Oustanding [Roll Forward]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_CommonStockOustandingRollForward" xlink:label="loc_lnt_CommonStockOustandingRollForward_9329B3E8ABD33DA5A8931996AA3F22D0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_468428310B86CF884B901996AA3F1BC7_periodStartLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_468428310B86CF884B901996AA3F1BC7" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Shares outstanding, January 1 (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_468428310B86CF884B901996AA3F1BC7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_E6E21771FDA4341CD5541996AA3FC9A9_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_E6E21771FDA4341CD5541996AA3FC9A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity-based compensation plans (in shares)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_E6E21771FDA4341CD5541996AA3FC9A9_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_E6E21771FDA4341CD5541996AA3FC9A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, Employee Stock Purchase Plans</link:label>
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    <link:label id="lab_lnt_OtherCommonStockActivity_39060E8A4DC1DFD4B8AF1996AA3F8E79_label_en-US" xlink:label="lab_lnt_OtherCommonStockActivity_39060E8A4DC1DFD4B8AF1996AA3F8E79" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Common Stock Activity</link:label>
    <link:label id="lab_lnt_OtherCommonStockActivity_39060E8A4DC1DFD4B8AF1996AA3F8E79_documentation_en-US" xlink:label="lab_lnt_OtherCommonStockActivity_39060E8A4DC1DFD4B8AF1996AA3F8E79" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Common Stock Activity</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_OtherCommonStockActivity" xlink:label="loc_lnt_OtherCommonStockActivity_39060E8A4DC1DFD4B8AF1996AA3F8E79" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_OtherCommonStockActivity_39060E8A4DC1DFD4B8AF1996AA3F8E79" xlink:to="lab_lnt_OtherCommonStockActivity_39060E8A4DC1DFD4B8AF1996AA3F8E79" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_95685193C66142B0B8B11996AA40936E_periodEndLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_95685193C66142B0B8B11996AA40936E" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Shares outstanding, September 30 (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_95685193C66142B0B8B11996AA40936E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_F2E2B655BBA5C34D0D6D292BA4F7348B_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_F2E2B655BBA5C34D0D6D292BA4F7348B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_F2E2B655BBA5C34D0D6D292BA4F7348B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EADD66E5DE51E53E5F63292BA4FCA896_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EADD66E5DE51E53E5F63292BA4FCA896" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EADD66E5DE51E53E5F63292BA4FCA896_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EADD66E5DE51E53E5F63292BA4FCA896" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EADD66E5DE51E53E5F63292BA4FCA896" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetIncomeLoss_59F940B8A34EBBBD1948292BA4FC180A_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_59F940B8A34EBBBD1948292BA4FC180A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_59F940B8A34EBBBD1948292BA4FC180A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_863CF81C6851CABA681E292BA4FDAF32_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_863CF81C6851CABA681E292BA4FDAF32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income to net cash flows from operating activities:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_863CF81C6851CABA681E292BA4FDAF32" xlink:type="locator" />
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    <link:label id="lab_lnt_AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations_98576EE7186B8FA0270D292BA4FDBEB2_terseLabel_en-US" xlink:label="lab_lnt_AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations_98576EE7186B8FA0270D292BA4FDBEB2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
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    <link:label id="lab_lnt_AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations_98576EE7186B8FA0270D292BA4FDBEB2_documentation_en-US" xlink:label="lab_lnt_AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations_98576EE7186B8FA0270D292BA4FDBEB2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The current period expense charged against earnings on long-lived, physical assets used in the normal conduct of business and not intended for resale to allocate or recognize the cost of assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; amounts include discontinued operations.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations" xlink:label="loc_lnt_AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations_98576EE7186B8FA0270D292BA4FDBEB2" xlink:type="locator" />
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    <link:label id="lab_lnt_DepreciationAndAmortizationCashFlow_649F5D8D57522AD59C79292BA4FDC37D_terseLabel_en-US" xlink:label="lab_lnt_DepreciationAndAmortizationCashFlow_649F5D8D57522AD59C79292BA4FDC37D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_lnt_DepreciationAndAmortizationCashFlow_649F5D8D57522AD59C79292BA4FDC37D_label_en-US" xlink:label="lab_lnt_DepreciationAndAmortizationCashFlow_649F5D8D57522AD59C79292BA4FDC37D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation and amortization, cash flow</link:label>
    <link:label id="lab_lnt_DepreciationAndAmortizationCashFlow_649F5D8D57522AD59C79292BA4FDC37D_documentation_en-US" xlink:label="lab_lnt_DepreciationAndAmortizationCashFlow_649F5D8D57522AD59C79292BA4FDC37D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The current period expense charged against earnings on long-lived, physical assets used in the normal conduct of business and not intended for resale to allocate or recognize the cost of assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_DepreciationAndAmortizationCashFlow" xlink:label="loc_lnt_DepreciationAndAmortizationCashFlow_649F5D8D57522AD59C79292BA4FDC37D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherAmortizationOfDeferredCharges_0D97437CAD0E02BC6038292BA4FD23D4_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAmortizationOfDeferredCharges_0D97437CAD0E02BC6038292BA4FD23D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other amortizations</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAmortizationOfDeferredCharges" xlink:label="loc_us-gaap_OtherAmortizationOfDeferredCharges_0D97437CAD0E02BC6038292BA4FD23D4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DeferredIncomeTaxesAndTaxCredits_D932C605788331153D06292BA4FE107C_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxesAndTaxCredits_D932C605788331153D06292BA4FE107C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred taxes and investment tax credits</link:label>
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    <link:label id="lab_lnt_PaymentsToAcquireProductiveAssetsBusinessLine1_B7914A1A3CCC1FB14EA1292BA500A87A_negatedLabel_en-US" xlink:label="lab_lnt_PaymentsToAcquireProductiveAssetsBusinessLine1_B7914A1A3CCC1FB14EA1292BA500A87A" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Utility construction and acquisition expenditures</link:label>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_120278667F47103D0C17292BA5000190_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_120278667F47103D0C17292BA5000190" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_120278667F47103D0C17292BA5000190_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_120278667F47103D0C17292BA5000190" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for (Proceeds from) Other Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_94F8DAC457B10F9D77CC292BA5001F9A_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_94F8DAC457B10F9D77CC292BA5001F9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_9D15D73612F2D68219F7292BA5019235_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_9D15D73612F2D68219F7292BA5019235" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from (used for) financing activities:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_5EC62B1A2349D835FB85292BA501077C" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_663B3F1A80905B3798C7292BA50126F8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock_803B20E82F7AA27DD50B292BA501D668_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock_803B20E82F7AA27DD50B292BA501D668" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Payments to redeem cumulative preferred stock</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock_803B20E82F7AA27DD50B292BA501D668" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfRedeemablePreferredStock_3C2C825F5A29DA519947292BA501930F_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfRedeemablePreferredStock_3C2C825F5A29DA519947292BA501930F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from issuance of cumulative preferred stock</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfRedeemablePreferredStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfRedeemablePreferredStock_3C2C825F5A29DA519947292BA501930F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_72D204493EB5854453B6292BA501483A_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_72D204493EB5854453B6292BA501483A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in commercial paper</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_72D204493EB5854453B6292BA501483A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_A24CC1879131F98365E6292BA5017649_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_A24CC1879131F98365E6292BA5017649" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_A24CC1879131F98365E6292BA5017649_label_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_A24CC1879131F98365E6292BA5017649" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Payments for) Other Financing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D3FBFED75C899EC11BB8292BA501A411_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D3FBFED75C899EC11BB8292BA501A411" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash flows from (used for) financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D3FBFED75C899EC11BB8292BA501A411_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D3FBFED75C899EC11BB8292BA501A411" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_D3FBFED75C899EC11BB8292BA501A411" xlink:type="locator" />
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    <link:label id="lab_lnt_CollectionsReinvestedInReceivables_DC426F3A8C04CE90ABFA83E47E7F033D_verboseLabel_en-US" xlink:label="lab_lnt_CollectionsReinvestedInReceivables_DC426F3A8C04CE90ABFA83E47E7F033D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Collections reinvested in receivables</link:label>
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    <link:label id="lab_lnt_FairValueOfDeferredProceedsOfReceivablesSold_DFAD480CFDD5755DA10283E47E8FDB23_verboseLabel_en-US" xlink:label="lab_lnt_FairValueOfDeferredProceedsOfReceivablesSold_DFAD480CFDD5755DA10283E47E8FDB23" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Deferred proceeds (sales of receivables)</link:label>
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    <link:label id="lab_lnt_RegulatoryAssetsAndLiabilitiesPolicyTextBlock_D81A4BA9DBAFE2E057642E40BD06AD7A_verboseLabel_en-US" xlink:label="lab_lnt_RegulatoryAssetsAndLiabilitiesPolicyTextBlock_D81A4BA9DBAFE2E057642E40BD06AD7A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Regulatory Assets and Regulatory Liabilities</link:label>
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    <link:label id="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentElectric_A0F1FFEB3550D0BA1ADA293475750E8F_verboseLabel_en-US" xlink:label="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentElectric_A0F1FFEB3550D0BA1ADA293475750E8F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Electric plant in service</link:label>
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    <link:label id="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentGas_9515239AE7AEF2EE844229347575B16F_verboseLabel_en-US" xlink:label="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentGas_9515239AE7AEF2EE844229347575B16F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gas plant in service</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation" xlink:label="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation_F336CC35576D90F52B16293475751564" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation_F336CC35576D90F52B16293475751564" xlink:to="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation_F336CC35576D90F52B16293475751564" xlink:type="arc" />
    <link:label id="lab_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA_totalLabel_en-US" xlink:label="lab_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net plant</link:label>
    <link:label id="lab_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA_label_en-US" xlink:label="lab_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Utility Plant</link:label>
    <link:label id="lab_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA_documentation_en-US" xlink:label="lab_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tangible assets that are held by an entity for use in the production or supply of utilities and that are expected to provide economic benefit for more than one year; net of accumulated depreciation.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_NetUtilityPlant" xlink:label="loc_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA" xlink:to="lab_lnt_NetUtilityPlant_13B161CC617242CA437729347575EDDA" xlink:type="arc" />
    <link:label id="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB_terseLabel_en-US" xlink:label="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leased Sheboygan Falls Energy Facility, less accumulated amortization</link:label>
    <link:label id="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB_label_en-US" xlink:label="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Property Plant And Equipment Leased</link:label>
    <link:label id="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB_documentation_en-US" xlink:label="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Property Plant And Equipment Leased</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased" xlink:label="loc_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB" xlink:to="lab_lnt_PublicUtilitiesPropertyPlantAndEquipmentLeased_FE77F6C72AD2DC322D332934757502EB" xlink:type="arc" />
    <link:label id="lab_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC_verboseLabel_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Construction work in progress:</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC_label_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction Work In Progress [Abstract]</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC_documentation_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Construction Work In Progress [Abstract]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_ConstructionWorkInProgressAbstract" xlink:label="loc_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC" xlink:to="lab_lnt_ConstructionWorkInProgressAbstract_E7D440E3C45F66F12DF7293475753CFC" xlink:type="arc" />
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A_terseLabel_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Columbia Energy Center Units 1 and 2 emission controls (WPL)</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A_label_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction Work In Progress Business Line 4</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A_documentation_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period end amount of construction work in progress in WPL's Columbia Units 1 and 2 emission controls project.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_ConstructionWorkInProgressBusinessLine4" xlink:label="loc_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A" xlink:to="lab_lnt_ConstructionWorkInProgressBusinessLine4_0AC433BA34AEA133169E29347575324A" xlink:type="arc" />
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791_terseLabel_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ottumwa Generating Station Unit 1 emission controls (IPL)</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791_label_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction Work In Progress Business Line 6</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791_documentation_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period end amount of construction work in progress in IPL's Ottumwa Unit 1 emission controls project.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_ConstructionWorkInProgressBusinessLine6" xlink:label="loc_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791" xlink:to="lab_lnt_ConstructionWorkInProgressBusinessLine6_EB34B4E8369FB6D33E5429347576F791" xlink:type="arc" />
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2_terseLabel_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">George Neal Generating Station Units 3 and 4 emission controls (IPL)</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2_label_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction Work In Progress Business Line 5</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2_documentation_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period end amount of construction work in progress in IPL's George Neal Units 3 and 4 emission controls project.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_ConstructionWorkInProgressBusinessLine5" xlink:label="loc_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2" xlink:to="lab_lnt_ConstructionWorkInProgressBusinessLine5_7CE9EC5947C313D1A1C12934757B2DC2" xlink:type="arc" />
    <link:label id="lab_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE_verboseLabel_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE_label_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction Work In Progress Other</link:label>
    <link:label id="lab_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE_documentation_en-US" xlink:label="lab_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period end amount of construction work in progress in all other projects.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_ConstructionWorkInProgressOther" xlink:label="loc_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE" xlink:to="lab_lnt_ConstructionWorkInProgressOther_A34B79F0A9551C2D58C72934757BB3AE" xlink:type="arc" />
    <link:label id="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment_C3F822813EBD38DDBF792934757B94DD_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment_C3F822813EBD38DDBF792934757B94DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other, less accumulated depreciation</link:label>
    <link:label id="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment_C3F822813EBD38DDBF792934757B94DD_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment_C3F822813EBD38DDBF792934757B94DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment" xlink:label="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment_C3F822813EBD38DDBF792934757B94DD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment_C3F822813EBD38DDBF792934757B94DD" xlink:to="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment_C3F822813EBD38DDBF792934757B94DD" xlink:type="arc" />
    <link:label id="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_1FB0B0ACACA4BB188B4A2934757B0293_totalLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_1FB0B0ACACA4BB188B4A2934757B0293" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total utility</link:label>
    <link:label id="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_1FB0B0ACACA4BB188B4A2934757B0293_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_1FB0B0ACACA4BB188B4A2934757B0293" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_1FB0B0ACACA4BB188B4A2934757B0293" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_1FB0B0ACACA4BB188B4A2934757B0293" xlink:to="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_1FB0B0ACACA4BB188B4A2934757B0293" xlink:type="arc" />
    <link:label id="lab_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1_verboseLabel_en-US" xlink:label="lab_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-regulated and other:</link:label>
    <link:label id="lab_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1_label_en-US" xlink:label="lab_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Property And Equipment [Abstract]</link:label>
    <link:label id="lab_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1_documentation_en-US" xlink:label="lab_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other property and equipment [Abstract]</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_OtherPropertyAndEquipmentAbstract" xlink:label="loc_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1" xlink:to="lab_lnt_OtherPropertyAndEquipmentAbstract_A749CAFF5347E57612DA2934757BB3C1" xlink:type="arc" />
    <link:label id="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167_verboseLabel_en-US" xlink:label="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-regulated Generation, less accumulated depreciation</link:label>
    <link:label id="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167_label_en-US" xlink:label="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Plant And Equipment Nonregulated Business Line 1</link:label>
    <link:label id="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167_documentation_en-US" xlink:label="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Carrying amount as of the balance sheet date of long-lived, depreciable Non-regulated Generation plant.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1" xlink:label="loc_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167" xlink:to="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine1_FF3159426EA9FCAA06052934757B9167" xlink:type="arc" />
    <link:label id="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0_verboseLabel_en-US" xlink:label="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation</link:label>
    <link:label id="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0_label_en-US" xlink:label="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Plant And Equipment Nonregulated Business Line 2</link:label>
    <link:label id="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0_documentation_en-US" xlink:label="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Carrying amount as of the balance sheet date of long-lived, depreciable Alliant Energy Corporate Services, Inc. and other plant.</link:label>
    <link:loc xlink:href="lnt-20130930.xsd#lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2" xlink:label="loc_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0" xlink:to="lab_lnt_PropertyPlantAndEquipmentNonregulatedBusinessLine2_6EA9718DCA3E74BFB5642934757BD6D0" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOther_501F912E5BA23E29A9892934757BD7CF_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOther_501F912E5BA23E29A9892934757BD7CF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total non-regulated and other</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOther_501F912E5BA23E29A9892934757BD7CF_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOther_501F912E5BA23E29A9892934757BD7CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Other, Gross</link:label>
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    <link:label id="lab_us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear_B5AF5E8A93F3F4CEF73C2934757C766D_terseLabel_en-US" xlink:label="lab_us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear_B5AF5E8A93F3F4CEF73C2934757C766D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unbilled utility revenues</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_us-gaap_IncomeTaxesReceivable_F9B4DF25A77E201C28192934757C70B7" xlink:type="locator" />
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