Investments (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of Equity Method Investments [Line Items]

Unconsolidated Equity Investments

Alliant Energy’s unconsolidated investments accounted for under the equity method of accounting are as follows (in millions):

	Ownership Interest at	Carrying Value at December 31,		Equity (Income) / Loss
	December 31, 2022	2022	2021	2022	2021	2020
ATC Holdings	16%, 20%	$358	$338	($41)	($43)	($47)
Non-utility wind farm in Oklahoma	50%	101	99	(5)	(4)	(8)
Corporate venture investments	Various	62	52	(3)	(13)	(4)
Other	Various	21	19	(2)	(2)	(2)
		$542	$508	($51)	($62)	($61)

Summary Financial Information

Summary aggregate financial information from the financial statements of these holdings is as follows (in millions):

	Alliant Energy
	2022	2021	2020
Revenues	$813	$802	$801
Operating income	350	357	376
Net income	675	358	343
As of December 31:
Current assets	227	112
Non-current assets	8,292	7,036
Current liabilities	620	455
Non-current liabilities	3,285	3,110
Noncontrolling interest	289	247