    <SEC-DOCUMENT>0000352541-20-000043-index.html : 20200406
    <SEC-HEADER>0000352541-20-000043.hdr.sgml : 20200406
    <ACCEPTANCE-DATETIME>20200403183236
    ACCESSION NUMBER:		0000352541-20-000043
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		23
    CONFORMED PERIOD OF REPORT:	20200403
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20200406
    DATE AS OF CHANGE:		20200403

    FILER:

    	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

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-09894
    		FILM NUMBER:		20775283

    	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
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>lnt040320208-k.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: lnt040320208-k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>lnt040320208kex991.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: lnt040320208kex991.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>lnt-20200403.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: lnt-20200403.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.CAL
    <SEQUENCE>4
    <FILENAME>lnt-20200403_cal.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: lnt-20200403_cal.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>5
    <FILENAME>lnt-20200403_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: lnt-20200403_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>6
    <FILENAME>lnt-20200403_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: lnt-20200403_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>7
    <FILENAME>lnt-20200403_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: lnt-20200403_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>lnt040320208kex991001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: lnt040320208kex991001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>lnt040320208kex991002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: lnt040320208kex991002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>lnt040320208kex991003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: lnt040320208kex991003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>lnt040320208kex991004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: lnt040320208kex991004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>lnt040320208kex991005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: lnt040320208kex991005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>lnt040320208kex991006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: lnt040320208kex991006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>lnt040320208kex991007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: lnt040320208kex991007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>lnt040320208kex991008.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: lnt040320208kex991008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>16
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 16 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>17
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 17 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>18
    <FILENAME>0000352541-20-000043-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: 0000352541-20-000043-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>19
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 19 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: FilingSummary.html

    Document 20 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>21
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>23
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>lnt040320208-k_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: lnt040320208-k_htm.html

    Document 24 - RAW XML: lnt040320208-k_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>