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Common Equity (Tables)

9 Months Ended

Sep. 30, 2023

Schedule of Capitalization, Equity [Line Items]

A summary of Alliant Energy’s common stock activity was as follows:


Shares outstanding, January 1, 2023			251,134,966
At-the-market offering program			3,569,937

Shareowner Direct Plan			339,850
Equity-based compensation plans			134,334

Shares outstanding, September 30, 2023			255,179,087

Changes in Shareowners' Equity

A summary of changes in shareowners’ equity was as follows (in millions):


Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in
		Additional		Other	Deferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Noncontrolling	Total
	Stock	Capital	Earnings	Income	Trust	Interest	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$—	$6,452
Net income attributable to Alliant Energy common shareowners			259				259
Common stock dividends ($0.4525 per share)			(115)				(115)
At-the-market offering program and Shareowner Direct Plan issuances		125					125
Equity-based compensation plans and other		3			1		4



Other comprehensive income, net of tax				1			1
Ending balance, September 30, 2023	$3	$2,982	$3,750	$4	($13)	$—	$6,726
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$3	$2,759	$3,387	$—	($12)	$29	$6,166
Net income attributable to Alliant Energy common shareowners			227				227
Common stock dividends ($0.4275 per share)			(106)				(106)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		2			(1)		1

Distributions to noncontrolling interest						(29)	(29)


Ending balance, September 30, 2022	$3	$2,767	$3,508	$—	($13)	$—	$6,265



Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in
		Additional		Other	Deferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Noncontrolling	Total
	Stock	Capital	Earnings	Income	Trust	Interest	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$3	$2,777	$3,509	$—	($13)	$—	$6,276
Net income attributable to Alliant Energy common shareowners			582				582
Common stock dividends ($1.3575 per share)			(341)				(341)
At-the-market offering program and Shareowner Direct Plan issuances		201					201
Equity-based compensation plans and other		4					4



Other comprehensive income, net of tax				4			4
Ending balance, September 30, 2023	$3	$2,982	$3,750	$4	($13)	$—	$6,726
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$3	$2,749	$3,250	$—	($12)	$—	$5,990
Net income attributable to Alliant Energy common shareowners			579				579
Common stock dividends ($1.2825 per share)			(322)				(322)
Shareowner Direct Plan issuances		19					19
Equity-based compensation plans and other		(1)	1		(1)		(1)
Contributions from noncontrolling interest						29	29
Distributions to noncontrolling interest						(29)	(29)


Ending balance, September 30, 2022	$3	$2,767	$3,508	$—	($13)	$—	$6,265



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$33	$2,847	$989	$3,869
Net income			170	170
Common stock dividends			(70)	(70)
Capital contributions from parent		20		20
Ending balance, September 30, 2023	$33	$2,867	$1,089	$3,989
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$33	$2,807	$942	$3,782
Net income			154	154
Common stock dividends			(80)	(80)

Ending balance, September 30, 2022	$33	$2,807	$1,016	$3,856




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$33	$2,807	$968	$3,808
Net income			331	331
Common stock dividends			(210)	(210)
Capital contributions from parent		60		60
Ending balance, September 30, 2023	$33	$2,867	$1,089	$3,989
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$33	$2,807	$929	$3,769
Net income			327	327
Common stock dividends			(240)	(240)

Ending balance, September 30, 2022	$33	$2,807	$1,016	$3,856


WPL	Total WPL Common Equity
		Additional
	Common	Paid-In	Retained	Noncontrolling	Total
	Stock	Capital	Earnings	Interest	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$66	$2,413	$1,260	$—	$3,739
Net income			107		107
Common stock dividends			(46)		(46)
Capital contributions from parent		65			65



Ending balance, September 30, 2023	$66	$2,478	$1,321	$—	$3,865
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$66	$1,968	$1,120	$29	$3,183
Net income			91		91
Common stock dividends			(44)		(44)
Capital contributions from parent		155			155

Distributions to noncontrolling interest				(29)	(29)

Ending balance, September 30, 2022	$66	$2,123	$1,167	$—	$3,356



WPL	Total WPL Common Equity
		Additional
	Common	Paid-In	Retained	Noncontrolling	Total
	Stock	Capital	Earnings	Interest	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$66	$2,233	$1,192	$—	$3,491
Net income			267		267
Common stock dividends			(138)		(138)
Capital contributions from parent		245			245



Ending balance, September 30, 2023	$66	$2,478	$1,321	$—	$3,865
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$66	$1,704	$1,053	$—	$2,823
Net income			247		247
Common stock dividends			(133)		(133)
Capital contributions from parent		420			420
Contributions from noncontrolling interest				29	29
Distributions to noncontrolling interest				(29)	(29)
Other		(1)			(1)
Ending balance, September 30, 2022	$66	$2,123	$1,167	$—	$3,356

IPL [Member]

Schedule of Capitalization, Equity [Line Items]

Changes in Shareowners' Equity

A summary of changes in shareowners’ equity was as follows (in millions):


Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in
		Additional		Other	Deferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Noncontrolling	Total
	Stock	Capital	Earnings	Income	Trust	Interest	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$—	$6,452
Net income attributable to Alliant Energy common shareowners			259				259
Common stock dividends ($0.4525 per share)			(115)				(115)
At-the-market offering program and Shareowner Direct Plan issuances		125					125
Equity-based compensation plans and other		3			1		4



Other comprehensive income, net of tax				1			1
Ending balance, September 30, 2023	$3	$2,982	$3,750	$4	($13)	$—	$6,726
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$3	$2,759	$3,387	$—	($12)	$29	$6,166
Net income attributable to Alliant Energy common shareowners			227				227
Common stock dividends ($0.4275 per share)			(106)				(106)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		2			(1)		1

Distributions to noncontrolling interest						(29)	(29)


Ending balance, September 30, 2022	$3	$2,767	$3,508	$—	($13)	$—	$6,265



Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in
		Additional		Other	Deferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Noncontrolling	Total
	Stock	Capital	Earnings	Income	Trust	Interest	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$3	$2,777	$3,509	$—	($13)	$—	$6,276
Net income attributable to Alliant Energy common shareowners			582				582
Common stock dividends ($1.3575 per share)			(341)				(341)
At-the-market offering program and Shareowner Direct Plan issuances		201					201
Equity-based compensation plans and other		4					4



Other comprehensive income, net of tax				4			4
Ending balance, September 30, 2023	$3	$2,982	$3,750	$4	($13)	$—	$6,726
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$3	$2,749	$3,250	$—	($12)	$—	$5,990
Net income attributable to Alliant Energy common shareowners			579				579
Common stock dividends ($1.2825 per share)			(322)				(322)
Shareowner Direct Plan issuances		19					19
Equity-based compensation plans and other		(1)	1		(1)		(1)
Contributions from noncontrolling interest						29	29
Distributions to noncontrolling interest						(29)	(29)


Ending balance, September 30, 2022	$3	$2,767	$3,508	$—	($13)	$—	$6,265



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$33	$2,847	$989	$3,869
Net income			170	170
Common stock dividends			(70)	(70)
Capital contributions from parent		20		20
Ending balance, September 30, 2023	$33	$2,867	$1,089	$3,989
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$33	$2,807	$942	$3,782
Net income			154	154
Common stock dividends			(80)	(80)

Ending balance, September 30, 2022	$33	$2,807	$1,016	$3,856




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$33	$2,807	$968	$3,808
Net income			331	331
Common stock dividends			(210)	(210)
Capital contributions from parent		60		60
Ending balance, September 30, 2023	$33	$2,867	$1,089	$3,989
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$33	$2,807	$929	$3,769
Net income			327	327
Common stock dividends			(240)	(240)

Ending balance, September 30, 2022	$33	$2,807	$1,016	$3,856


WPL	Total WPL Common Equity
		Additional
	Common	Paid-In	Retained	Noncontrolling	Total
	Stock	Capital	Earnings	Interest	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$66	$2,413	$1,260	$—	$3,739
Net income			107		107
Common stock dividends			(46)		(46)
Capital contributions from parent		65			65



Ending balance, September 30, 2023	$66	$2,478	$1,321	$—	$3,865
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$66	$1,968	$1,120	$29	$3,183
Net income			91		91
Common stock dividends			(44)		(44)
Capital contributions from parent		155			155

Distributions to noncontrolling interest				(29)	(29)

Ending balance, September 30, 2022	$66	$2,123	$1,167	$—	$3,356



WPL	Total WPL Common Equity
		Additional
	Common	Paid-In	Retained	Noncontrolling	Total
	Stock	Capital	Earnings	Interest	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$66	$2,233	$1,192	$—	$3,491
Net income			267		267
Common stock dividends			(138)		(138)
Capital contributions from parent		245			245



Ending balance, September 30, 2023	$66	$2,478	$1,321	$—	$3,865
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$66	$1,704	$1,053	$—	$2,823
Net income			247		247
Common stock dividends			(133)		(133)
Capital contributions from parent		420			420
Contributions from noncontrolling interest				29	29
Distributions to noncontrolling interest				(29)	(29)
Other		(1)			(1)
Ending balance, September 30, 2022	$66	$2,123	$1,167	$—	$3,356

WPL [Member]

Schedule of Capitalization, Equity [Line Items]

Changes in Shareowners' Equity

A summary of changes in shareowners’ equity was as follows (in millions):


Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in
		Additional		Other	Deferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Noncontrolling	Total
	Stock	Capital	Earnings	Income	Trust	Interest	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$—	$6,452
Net income attributable to Alliant Energy common shareowners			259				259
Common stock dividends ($0.4525 per share)			(115)				(115)
At-the-market offering program and Shareowner Direct Plan issuances		125					125
Equity-based compensation plans and other		3			1		4



Other comprehensive income, net of tax				1			1
Ending balance, September 30, 2023	$3	$2,982	$3,750	$4	($13)	$—	$6,726
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$3	$2,759	$3,387	$—	($12)	$29	$6,166
Net income attributable to Alliant Energy common shareowners			227				227
Common stock dividends ($0.4275 per share)			(106)				(106)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		2			(1)		1

Distributions to noncontrolling interest						(29)	(29)


Ending balance, September 30, 2022	$3	$2,767	$3,508	$—	($13)	$—	$6,265



Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in
		Additional		Other	Deferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Noncontrolling	Total
	Stock	Capital	Earnings	Income	Trust	Interest	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$3	$2,777	$3,509	$—	($13)	$—	$6,276
Net income attributable to Alliant Energy common shareowners			582				582
Common stock dividends ($1.3575 per share)			(341)				(341)
At-the-market offering program and Shareowner Direct Plan issuances		201					201
Equity-based compensation plans and other		4					4



Other comprehensive income, net of tax				4			4
Ending balance, September 30, 2023	$3	$2,982	$3,750	$4	($13)	$—	$6,726
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$3	$2,749	$3,250	$—	($12)	$—	$5,990
Net income attributable to Alliant Energy common shareowners			579				579
Common stock dividends ($1.2825 per share)			(322)				(322)
Shareowner Direct Plan issuances		19					19
Equity-based compensation plans and other		(1)	1		(1)		(1)
Contributions from noncontrolling interest						29	29
Distributions to noncontrolling interest						(29)	(29)


Ending balance, September 30, 2022	$3	$2,767	$3,508	$—	($13)	$—	$6,265



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$33	$2,847	$989	$3,869
Net income			170	170
Common stock dividends			(70)	(70)
Capital contributions from parent		20		20
Ending balance, September 30, 2023	$33	$2,867	$1,089	$3,989
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$33	$2,807	$942	$3,782
Net income			154	154
Common stock dividends			(80)	(80)

Ending balance, September 30, 2022	$33	$2,807	$1,016	$3,856




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$33	$2,807	$968	$3,808
Net income			331	331
Common stock dividends			(210)	(210)
Capital contributions from parent		60		60
Ending balance, September 30, 2023	$33	$2,867	$1,089	$3,989
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$33	$2,807	$929	$3,769
Net income			327	327
Common stock dividends			(240)	(240)

Ending balance, September 30, 2022	$33	$2,807	$1,016	$3,856


WPL	Total WPL Common Equity
		Additional
	Common	Paid-In	Retained	Noncontrolling	Total
	Stock	Capital	Earnings	Interest	Equity
Three Months Ended September 30, 2023
Beginning balance, June 30, 2023	$66	$2,413	$1,260	$—	$3,739
Net income			107		107
Common stock dividends			(46)		(46)
Capital contributions from parent		65			65



Ending balance, September 30, 2023	$66	$2,478	$1,321	$—	$3,865
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022	$66	$1,968	$1,120	$29	$3,183
Net income			91		91
Common stock dividends			(44)		(44)
Capital contributions from parent		155			155

Distributions to noncontrolling interest				(29)	(29)

Ending balance, September 30, 2022	$66	$2,123	$1,167	$—	$3,356



WPL	Total WPL Common Equity
		Additional
	Common	Paid-In	Retained	Noncontrolling	Total
	Stock	Capital	Earnings	Interest	Equity
Nine Months Ended September 30, 2023
Beginning balance, December 31, 2022	$66	$2,233	$1,192	$—	$3,491
Net income			267		267
Common stock dividends			(138)		(138)
Capital contributions from parent		245			245



Ending balance, September 30, 2023	$66	$2,478	$1,321	$—	$3,865
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021	$66	$1,704	$1,053	$—	$2,823
Net income			247		247
Common stock dividends			(133)		(133)
Capital contributions from parent		420			420
Contributions from noncontrolling interest				29	29
Distributions to noncontrolling interest				(29)	(29)
Other		(1)			(1)
Ending balance, September 30, 2022	$66	$2,123	$1,167	$—	$3,356