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Common Equity (Tables)

9 Months Ended

Sep. 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			348,087
Equity-based compensation plans			154,267

Shares outstanding, September 30, 2024			256,599,202

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 September 30, 2024
Beginning balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Net income attributable to Alliant Energy common shareowners			295			295
Common stock dividends ($0.48 per share)			(123)			(123)
Shareowner Direct Plan issuances		6				6
Equity-based compensation plans and other		4			(1)	3



Other comprehensive loss, net of tax				(4)		(4)
Ending balance, September 30, 2024	$3	$3,052	$3,927	($1)	($13)	$6,968
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




Alliant Energy				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income (Loss)	Trust	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$3	$3,030	$3,756	$1	($13)	$6,777
Net income attributable to Alliant Energy common shareowners			540			540
Common stock dividends ($1.44 per share)			(369)			(369)
Shareowner Direct Plan issuances		18				18
Equity-based compensation plans and other		4				4



Other comprehensive loss, net of tax				(2)		(2)
Ending balance, September 30, 2024	$3	$3,052	$3,927	($1)	($13)	$6,968
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



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2024
Beginning balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Net income			190	190
Common stock dividends			(50)	(50)
Capital contributions from parent		200		200
Ending balance, September 30, 2024	$33	$3,212	$1,175	$4,420
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




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$33	$2,887	$1,054	$3,974
Net income			272	272
Common stock dividends			(151)	(151)
Capital contributions from parent		325		325
Ending balance, September 30, 2024	$33	$3,212	$1,175	$4,420
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



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2024
Beginning balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Net income			114	114
Common stock dividends			(49)	(49)




Ending balance, September 30, 2024	$66	$2,533	$1,476	$4,075
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




WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$66	$2,478	$1,353	$3,897
Net income			270	270
Common stock dividends			(147)	(147)
Capital contributions from parent		55		55



Ending balance, September 30, 2024	$66	$2,533	$1,476	$4,075
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

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 September 30, 2024
Beginning balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Net income attributable to Alliant Energy common shareowners			295			295
Common stock dividends ($0.48 per share)			(123)			(123)
Shareowner Direct Plan issuances		6				6
Equity-based compensation plans and other		4			(1)	3



Other comprehensive loss, net of tax				(4)		(4)
Ending balance, September 30, 2024	$3	$3,052	$3,927	($1)	($13)	$6,968
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




Alliant Energy				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income (Loss)	Trust	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$3	$3,030	$3,756	$1	($13)	$6,777
Net income attributable to Alliant Energy common shareowners			540			540
Common stock dividends ($1.44 per share)			(369)			(369)
Shareowner Direct Plan issuances		18				18
Equity-based compensation plans and other		4				4



Other comprehensive loss, net of tax				(2)		(2)
Ending balance, September 30, 2024	$3	$3,052	$3,927	($1)	($13)	$6,968
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



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2024
Beginning balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Net income			190	190
Common stock dividends			(50)	(50)
Capital contributions from parent		200		200
Ending balance, September 30, 2024	$33	$3,212	$1,175	$4,420
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




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$33	$2,887	$1,054	$3,974
Net income			272	272
Common stock dividends			(151)	(151)
Capital contributions from parent		325		325
Ending balance, September 30, 2024	$33	$3,212	$1,175	$4,420
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



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2024
Beginning balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Net income			114	114
Common stock dividends			(49)	(49)




Ending balance, September 30, 2024	$66	$2,533	$1,476	$4,075
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




WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$66	$2,478	$1,353	$3,897
Net income			270	270
Common stock dividends			(147)	(147)
Capital contributions from parent		55		55



Ending balance, September 30, 2024	$66	$2,533	$1,476	$4,075
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

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 September 30, 2024
Beginning balance, June 30, 2024	$3	$3,042	$3,755	$3	($12)	$6,791
Net income attributable to Alliant Energy common shareowners			295			295
Common stock dividends ($0.48 per share)			(123)			(123)
Shareowner Direct Plan issuances		6				6
Equity-based compensation plans and other		4			(1)	3



Other comprehensive loss, net of tax				(4)		(4)
Ending balance, September 30, 2024	$3	$3,052	$3,927	($1)	($13)	$6,968
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




Alliant Energy				Accumulated	Shares in
		Additional		Other	Deferred	Total
	Common	Paid-In	Retained	Comprehensive	Compensation	Common
	Stock	Capital	Earnings	Income (Loss)	Trust	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$3	$3,030	$3,756	$1	($13)	$6,777
Net income attributable to Alliant Energy common shareowners			540			540
Common stock dividends ($1.44 per share)			(369)			(369)
Shareowner Direct Plan issuances		18				18
Equity-based compensation plans and other		4				4



Other comprehensive loss, net of tax				(2)		(2)
Ending balance, September 30, 2024	$3	$3,052	$3,927	($1)	($13)	$6,968
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



IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2024
Beginning balance, June 30, 2024	$33	$3,012	$1,035	$4,080
Net income			190	190
Common stock dividends			(50)	(50)
Capital contributions from parent		200		200
Ending balance, September 30, 2024	$33	$3,212	$1,175	$4,420
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




IPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$33	$2,887	$1,054	$3,974
Net income			272	272
Common stock dividends			(151)	(151)
Capital contributions from parent		325		325
Ending balance, September 30, 2024	$33	$3,212	$1,175	$4,420
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



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2024
Beginning balance, June 30, 2024	$66	$2,533	$1,411	$4,010
Net income			114	114
Common stock dividends			(49)	(49)




Ending balance, September 30, 2024	$66	$2,533	$1,476	$4,075
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




WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2024
Beginning balance, December 31, 2023	$66	$2,478	$1,353	$3,897
Net income			270	270
Common stock dividends			(147)	(147)
Capital contributions from parent		55		55



Ending balance, September 30, 2024	$66	$2,533	$1,476	$4,075
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