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Common Equity | 12 Months Ended
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Dec. 31, 2023
Schedule of Common Equity [Line Items] |
Common Equity | COMMON EQUITY Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
| 2023 |  | 2022 |  | 2021
Shares outstanding, January 1 | 251,134,966 |  |  | 250,474,529 |  |  | 249,868,415 |
At-the-market offering program | 4,372,561 |  |  | — |  |  | — |
Shareowner Direct Plan | 454,987 |  |  | 437,669 |  |  | 492,565 |
Equity-based compensation plans | 134,334 |  |  | 222,768 |  |  | 113,549 |
Shares outstanding, December 31 | 256,096,848 |  |  | 251,134,966 |  |  | 250,474,529 |
At December 31, 2023, Alliant Energy had a total of 13 million shares available for issuance in the aggregate, pursuant to its 2020 OIP, Shareowner Direct Plan and 401(k) Savings Plan. At-the-Market Offering Program - In December 2022, Alliant Energy filed a prospectus supplement to sell up to $225 million of its common stock through an at-the-market offering program. As of December 31, 2023, Alliant Energy issued 4,372,561 shares of common stock through this program and received cash proceeds of $223 million, net of $2 million in commissions and fees. The proceeds from the issuances of common stock were used for general corporate purposes. This at-the-market offering program has expired. Shareowner Direct Plan - Alliant Energy satisfies its requirements under the Shareowner Direct Plan (dividend reinvestment and stock purchase plan) by acquiring Alliant Energy common stock through original issue, rather than on the open market.

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