Investments

12 Months Ended

Dec. 31, 2022

Schedule of Equity Method Investments [Line Items]

INVESTMENTS

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 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

ATC Holdings - As of December 31, 2022, Alliant Energy has a 16% ownership interest in ATC and a 20% ownership interest in ATC Holdco LLC, collectively referred to as ATC Holdings. ATC is an independent, for-profit, transmission-only company. ATC Holdco LLC holds Duke-American Transmission Company, LLC, a joint venture between Duke Energy Corporation and ATC, that owns electric transmission infrastructure in North America. Refer to Note 17(g) for discussion of a reduction in earnings recorded in 2022 related to a court decision, which is currently expected to reduce the base return on equity authorized for MISO transmission owners, including ATC.

Non-utility Wind Farm in Oklahoma - The non-utility wind farm located in Oklahoma provides electricity to a third-party under a long-term PPA, and has both cash and tax equity ownership. Alliant Energy does not maintain or operate the wind farm, and provided a parent guarantee of its subsidiary’s indemnification obligations under the operating agreement and PPA. Refer to Note 17(d) for discussion of the guarantee.

Corporate Venture Investments - Alliant Energy has various minority ownership interests in regional and national venture funds, including a global coalition of energy companies working together to help advance the transition towards a cleaner, more sustainable, and inclusive energy future, by identifying and researching innovative technologies and business models within the emerging energy economy.