Investments

12 Months Ended

Dec. 31, 2020

Schedule of Equity Method Investments [Line Items]

Investments

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, 2020	2020	2019	2020	2019	2018
ATC Holdings	16%, 20%	$331	$320	($47)	($45)	($38)
Non-utility wind farm in Oklahoma	50%	103	105	(8)	(5)	(16)
Other	Various	42	33	(6)	(3)	(1)
		$476	$458	($61)	($53)	($55)

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

	Alliant Energy
	2020	2019	2018
Revenues	$801	$783	$724
Operating income	376	359	325
Net income	343	340	217
As of December 31:
Current assets	121	139
Non-current assets	6,388	5,964
Current liabilities	317	507
Non-current liabilities	2,997	2,659
Noncontrolling interest	192	208

ATC Holdings - As of December 31, 2020, 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.

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. The equity income recognized in 2018 was primarily related to the impacts of Federal Tax Reform. The liquidation method utilized to recognize Alliant Energy’s share of the wind farm’s earnings includes utilizing the federal income tax rate in effect as of the end of the measurement period. The lower federal income tax rate effective as of January 1, 2018 resulted in an acceleration of earnings attributable to Alliant Energy’s interest in the Oklahoma wind farm. This increase in earnings is expected to reverse over time. 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.