Investments (Tables)

9 Months Ended

Sep. 30, 2023

Schedule of Equity Method Investments [Line Items]

Unconsolidated Equity Investments

Alliant Energy’s equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and nine months ended September 30 was as follows (in millions):

	Three Months		Nine Months
	2023	2022	2023	2022
ATC Holdings	($12)	($7)	($37)	($29)
Other	(2)	2	(8)	(8)
	($14)	($5)	($45)	($37)