<SEC-DOCUMENT>0000352541-17-000012.txt : 20170216
<SEC-HEADER>0000352541-17-000012.hdr.sgml : 20170216
<ACCEPTANCE-DATETIME>20170216173245
ACCESSION NUMBER:		0000352541-17-000012
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20170215
FILED AS OF DATE:		20170216
DATE AS OF CHANGE:		20170216

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLIANT ENERGY CORP
		CENTRAL INDEX KEY:			0000352541
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				391380265
		STATE OF INCORPORATION:			WI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4902 NORTH BILTMORE LANE
		STREET 2:		SUITE 1000
		CITY:			MADISON
		STATE:			WI
		ZIP:			53718-2148
		BUSINESS PHONE:		608-458-3311

	MAIL ADDRESS:	
		STREET 1:		4902 NORTH BILTMORE LANE
		STREET 2:		SUITE 1000
		CITY:			MADISON
		STATE:			WI
		ZIP:			53718-2148

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERSTATE ENERGY CORP
		DATE OF NAME CHANGE:	19980427

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WPL HOLDINGS INC
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DURIAN ROBERT J
		CENTRAL INDEX KEY:			0001512789

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09894
		FILM NUMBER:		17618954

	MAIL ADDRESS:	
		STREET 1:		P O BOX 14720
		CITY:			MADISON
		STATE:			WI
		ZIP:			53708
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_148728433653771.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-02-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000352541</issuerCik>
        <issuerName>ALLIANT ENERGY CORP</issuerName>
        <issuerTradingSymbol>LNT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001512789</rptOwnerCik>
            <rptOwnerName>DURIAN ROBERT J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ALLIANT ENERGY CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>PO BOX 14720</rptOwnerStreet2>
            <rptOwnerCity>MADISON</rptOwnerCity>
            <rptOwnerState>WI</rptOwnerState>
            <rptOwnerZipCode>53708-0720</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP, CFO and Treasurer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-02-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1369</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.54</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3822.796</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4205.622</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By 401(k) Plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Includes adjustments for accrued dividends, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.</footnote>
        <footnote id="F2">Includes adjustment for the issuer's 2-for-1 common stock split distributed May 19, 2016.</footnote>
        <footnote id="F3">Reflects 401(k) holdings as of this filing date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Wenyu T. Blanchard, Attorney in-Fact</signatureName>
        <signatureDate>2017-02-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa_durianrobert.htm
<DESCRIPTION>DURIAN POA
<TEXT>
<!-- Document created using Workiva -->
<html>
<body>
<pre>
POWER OF ATTORNEY                    Exhibit 24



    KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned does
 hereby constitute and appoint each of James H. Gallegos, Wenyu T. Blanchard, and Jake C. Blavat
 the true and lawful agents and attorneys-in-fact of the undersigned, with respect to all
 matters arising in connection with the undersigned's reporting obligations under
 Section 16(a) of the Securities Exchange Act of 1934 (the "Exchange Act") as
 amended, and related rules and regulations, with full power and authority to execute
 and deliver for and on behalf of the undersigned all Securities and Exchange
 Commission Forms 3, 4, 5 and other documents in connection therewith regarding
 Alliant Energy Corporation, Interstate Power and Light Company, and Wisconsin
 Power and Light Company (collectively, the "Company") securities, as each of said
 agents and attorneys-in-fact may deem advisable.  The undersigned hereby gives
 each of said agents and attorneys-in-fact full power and authority to act in the
 premises, and hereby ratifies and confirms all that each of said agents and attorneys
 -in-fact may do by virtue hereof.


    The undersigned acknowledges that each attorney-in-fact, in serving in such
 capacity at the request of the undersigned, is not assuming any of the undersigned's
 responsibilities to comply with the Exchange Act.  The undersigned agrees to defend
 and hold harmless each attorney-in-fact from and against any and all loss, damage or
 liability that such attorney-in-fact may sustain as a result of any action taken in good
 faith hereunder.

    This Power of Attorney shall remain in full force and effect until the undersigned
 is no longer required to file documents with respect to the undersigned's holdings of
 and transactions in securities issued by the Company, unless earlier revoked by the
 undersigned in writing or by executing a new Power of Attorney.

    IN WITNESS WHEREOF, I have executed this Power of Attorney on this
 6th day of February, 2017.


                            /s/ Robert J. Durian
                            Robert J. Durian



</pre>
</body>
</html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
