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Investments | 12 Months Ended
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Dec. 31, 2021
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, 2021 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2019
ATC Holdings | 16%, 20% |  | $338 |  | $331 |  | ($43) |  | ($47) |  | ($45)
Non-utility wind farm in Oklahoma | 50% |  | 99 |  | 103 |  | (4) |  | (8) |  | (5)
Corporate venture investments | Various |  | 52 |  | 31 |  | (13) |  | (4) |  | (1)
Other | Various |  | 19 |  | 11 |  | (2) |  | (2) |  | (2)
|  |  | $508 |  | $476 |  | ($62) |  | ($61) |  | ($53)
Summary aggregate financial information from the financial statements of these holdings is as follows (in millions):
| Alliant Energy |  |
| 2021 |  | 2020 |  | 2019 |  |  |  |  |  |
Revenues | $802 |  |  | $801 |  |  | $783 |  |  |  |  |  |  |
Operating income | 357 |  |  | 376 |  |  | 359 |  |  |  |  |  |  |
Net income | 358 |  |  | 343 |  |  | 340 |  |  |  |  |  |  |
As of December 31: |  |  |  |  |  |  |  |  |  |  |
Current assets | 112 |  |  | 121 |  |  |  |  |  |  |  |  |
Non-current assets | 7,036 |  |  | 6,388 |  |  |  |  |  |  |  |  |
Current liabilities | 455 |  |  | 317 |  |  |  |  |  |  |  |  |
Non-current liabilities | 3,110 |  |  | 2,997 |  |  |  |  |  |  |  |  |
Noncontrolling interest | 247 |  |  | 192 |  |  |  |  |  |  |  |  |
ATC Holdings - As of December 31, 2021, 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. 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 coalition with different energy companies across the U.S., working together to help identify and research innovative products, technologies and business models within the emerging energy economy.

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