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Common Equity (Tables)

6 Months Ended

Jun. 30, 2024

Schedule of Capitalization, Equity [Line Items]

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


Shares outstanding, January 1, 2024			256,096,848


Shareowner Direct Plan			248,460
Equity-based compensation plans			154,267

Shares outstanding, June 30, 2024			256,499,575

Changes in Shareowners' Equity

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



Alliant Energy				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income (Loss)	Trust	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$3	$3,033	$3,791	$2	($12)	$6,817
Net income attributable to Alliant Energy common shareowners			87			87
Common stock dividends ($0.48 per share)			(123)			(123)
Shareowner Direct Plan issuances		6				6
Equity-based compensation plans and other		3				3



Other comprehensive income, net of tax				1		1
Ending balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$3	$2,780	$3,559	($1)	($13)	$6,328
Net income attributable to Alliant Energy common shareowners			160			160
Common stock dividends ($0.4525 per share)			(113)			(113)
At-the-market offering program and Shareowner Direct Plan issuances		70				70
Equity-based compensation plans and other		4			(1)	3



Other comprehensive income, net of tax				4		4
Ending balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$6,452




Alliant Energy				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income	Trust	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$3	$3,030	$3,756	$1	($13)	$6,777
Net income attributable to Alliant Energy common shareowners			245			245
Common stock dividends ($0.96 per share)			(246)			(246)
Shareowner Direct Plan issuances		12				12
Equity-based compensation plans and other					1	1



Other comprehensive income, net of tax				2		2
Ending balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$3	$2,777	$3,509	$—	($13)	$6,276
Net income attributable to Alliant Energy common shareowners			323			323
Common stock dividends ($0.905 per share)			(226)			(226)
At-the-market offering program and Shareowner Direct Plan issuances		76				76
Equity-based compensation plans and other		1			(1)	—



Other comprehensive income, net of tax				3		3
Ending balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$6,452



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$33	$2,937	$1,067	$4,037
Net income			18	18
Common stock dividends			(50)	(50)
Capital contributions from parent		75		75
Ending balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$33	$2,807	$970	$3,810
Net income			89	89
Common stock dividends			(70)	(70)
Capital contributions from parent		40		40
Ending balance, June 30, 2023	$33	$2,847	$989	$3,869




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$33	$2,887	$1,054	$3,974
Net income			81	81
Common stock dividends			(100)	(100)
Capital contributions from parent		125		125
Ending balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$33	$2,807	$968	$3,808
Net income			161	161
Common stock dividends			(140)	(140)
Capital contributions from parent		40		40
Ending balance, June 30, 2023	$33	$2,847	$989	$3,869



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$66	$2,533	$1,396	$3,995
Net income			64	64
Common stock dividends			(49)	(49)




Ending balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$66	$2,413	$1,234	$3,713
Net income			72	72
Common stock dividends			(46)	(46)




Ending balance, June 30, 2023	$66	$2,413	$1,260	$3,739




WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$66	$2,478	$1,353	$3,897
Net income			156	156
Common stock dividends			(98)	(98)
Capital contributions from parent		55		55



Ending balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$66	$2,233	$1,192	$3,491
Net income			160	160
Common stock dividends			(92)	(92)
Capital contributions from parent		180		180



Ending balance, June 30, 2023	$66	$2,413	$1,260	$3,739

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				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income (Loss)	Trust	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$3	$3,033	$3,791	$2	($12)	$6,817
Net income attributable to Alliant Energy common shareowners			87			87
Common stock dividends ($0.48 per share)			(123)			(123)
Shareowner Direct Plan issuances		6				6
Equity-based compensation plans and other		3				3



Other comprehensive income, net of tax				1		1
Ending balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$3	$2,780	$3,559	($1)	($13)	$6,328
Net income attributable to Alliant Energy common shareowners			160			160
Common stock dividends ($0.4525 per share)			(113)			(113)
At-the-market offering program and Shareowner Direct Plan issuances		70				70
Equity-based compensation plans and other		4			(1)	3



Other comprehensive income, net of tax				4		4
Ending balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$6,452




Alliant Energy				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income	Trust	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$3	$3,030	$3,756	$1	($13)	$6,777
Net income attributable to Alliant Energy common shareowners			245			245
Common stock dividends ($0.96 per share)			(246)			(246)
Shareowner Direct Plan issuances		12				12
Equity-based compensation plans and other					1	1



Other comprehensive income, net of tax				2		2
Ending balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$3	$2,777	$3,509	$—	($13)	$6,276
Net income attributable to Alliant Energy common shareowners			323			323
Common stock dividends ($0.905 per share)			(226)			(226)
At-the-market offering program and Shareowner Direct Plan issuances		76				76
Equity-based compensation plans and other		1			(1)	—



Other comprehensive income, net of tax				3		3
Ending balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$6,452



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$33	$2,937	$1,067	$4,037
Net income			18	18
Common stock dividends			(50)	(50)
Capital contributions from parent		75		75
Ending balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$33	$2,807	$970	$3,810
Net income			89	89
Common stock dividends			(70)	(70)
Capital contributions from parent		40		40
Ending balance, June 30, 2023	$33	$2,847	$989	$3,869




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$33	$2,887	$1,054	$3,974
Net income			81	81
Common stock dividends			(100)	(100)
Capital contributions from parent		125		125
Ending balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$33	$2,807	$968	$3,808
Net income			161	161
Common stock dividends			(140)	(140)
Capital contributions from parent		40		40
Ending balance, June 30, 2023	$33	$2,847	$989	$3,869



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$66	$2,533	$1,396	$3,995
Net income			64	64
Common stock dividends			(49)	(49)




Ending balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$66	$2,413	$1,234	$3,713
Net income			72	72
Common stock dividends			(46)	(46)




Ending balance, June 30, 2023	$66	$2,413	$1,260	$3,739




WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$66	$2,478	$1,353	$3,897
Net income			156	156
Common stock dividends			(98)	(98)
Capital contributions from parent		55		55



Ending balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$66	$2,233	$1,192	$3,491
Net income			160	160
Common stock dividends			(92)	(92)
Capital contributions from parent		180		180



Ending balance, June 30, 2023	$66	$2,413	$1,260	$3,739

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				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income (Loss)	Trust	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$3	$3,033	$3,791	$2	($12)	$6,817
Net income attributable to Alliant Energy common shareowners			87			87
Common stock dividends ($0.48 per share)			(123)			(123)
Shareowner Direct Plan issuances		6				6
Equity-based compensation plans and other		3				3



Other comprehensive income, net of tax				1		1
Ending balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$3	$2,780	$3,559	($1)	($13)	$6,328
Net income attributable to Alliant Energy common shareowners			160			160
Common stock dividends ($0.4525 per share)			(113)			(113)
At-the-market offering program and Shareowner Direct Plan issuances		70				70
Equity-based compensation plans and other		4			(1)	3



Other comprehensive income, net of tax				4		4
Ending balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$6,452




Alliant Energy				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income	Trust	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$3	$3,030	$3,756	$1	($13)	$6,777
Net income attributable to Alliant Energy common shareowners			245			245
Common stock dividends ($0.96 per share)			(246)			(246)
Shareowner Direct Plan issuances		12				12
Equity-based compensation plans and other					1	1



Other comprehensive income, net of tax				2		2
Ending balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$3	$2,777	$3,509	$—	($13)	$6,276
Net income attributable to Alliant Energy common shareowners			323			323
Common stock dividends ($0.905 per share)			(226)			(226)
At-the-market offering program and Shareowner Direct Plan issuances		76				76
Equity-based compensation plans and other		1			(1)	—



Other comprehensive income, net of tax				3		3
Ending balance, June 30, 2023	$3	$2,854	$3,606	$3	($14)	$6,452



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$33	$2,937	$1,067	$4,037
Net income			18	18
Common stock dividends			(50)	(50)
Capital contributions from parent		75		75
Ending balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$33	$2,807	$970	$3,810
Net income			89	89
Common stock dividends			(70)	(70)
Capital contributions from parent		40		40
Ending balance, June 30, 2023	$33	$2,847	$989	$3,869




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$33	$2,887	$1,054	$3,974
Net income			81	81
Common stock dividends			(100)	(100)
Capital contributions from parent		125		125
Ending balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$33	$2,807	$968	$3,808
Net income			161	161
Common stock dividends			(140)	(140)
Capital contributions from parent		40		40
Ending balance, June 30, 2023	$33	$2,847	$989	$3,869



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2024
Beginning balance, March 31, 2024	$66	$2,533	$1,396	$3,995
Net income			64	64
Common stock dividends			(49)	(49)




Ending balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023	$66	$2,413	$1,234	$3,713
Net income			72	72
Common stock dividends			(46)	(46)




Ending balance, June 30, 2023	$66	$2,413	$1,260	$3,739




WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2024
Beginning balance, December 31, 2023	$66	$2,478	$1,353	$3,897
Net income			156	156
Common stock dividends			(98)	(98)
Capital contributions from parent		55		55



Ending balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022	$66	$2,233	$1,192	$3,491
Net income			160	160
Common stock dividends			(92)	(92)
Capital contributions from parent		180		180



Ending balance, June 30, 2023	$66	$2,413	$1,260	$3,739