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Common Equity | 3 Months Ended
--- | ---
Mar. 31, 2023
Common Equity [Line Items] |
Common Equity | COMMON EQUITY Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2023 | 251,134,966 |
Shareowner Direct Plan | 118,488 |
Equity-based compensation plans | 134,334 |
Shares outstanding, March 31, 2023 | 251,387,788 |
Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant Energy |  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  | Total
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  |  |  | Common
| Stock |  | Capital |  | Earnings |  | Loss |  | Trust |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $3 |  | $2,777 |  | $3,509 |  | $— |  | ($13) |  |  |  | $6,276
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 163 |  |  |  |  |  |  |  | 163
Common stock dividends ($0.4525 per share) |  |  |  |  | (113) |  |  |  |  |  |  |  | (113)
Shareowner Direct Plan issuances |  |  | 6 |  |  |  |  |  |  |  |  |  | 6
Equity-based compensation plans and other |  |  | (3) |  |  |  |  |  |  |  |  |  | (3)
Other comprehensive loss, net of tax |  |  |  |  |  |  | (1) |  |  |  |  |  | (1)
Ending balance, March 31, 2023 | $3 |  | $2,780 |  | $3,559 |  | ($1) |  | ($13) |  |  |  | $6,328
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $3 |  | $2,749 |  | $3,250 |  | $— |  | ($12) |  |  |  | $5,990
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 192 |  |  |  |  |  |  |  | 192
Common stock dividends ($0.4275 per share) |  |  |  |  | (107) |  |  |  |  |  |  |  | (107)
Shareowner Direct Plan issuances |  |  | 7 |  |  |  |  |  |  |  |  |  | 7
Equity-based compensation plans and other |  |  | (6) |  | 1 |  |  |  |  |  |  |  | (5)
Ending balance, March 31, 2022 | $3 |  | $2,750 |  | $3,336 |  | $— |  | ($12) |  |  |  | $6,077
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $33 |  | $2,807 |  | $968 |  |  |  | $3,808
Net income |  |  |  |  | 72 |  |  |  | 72
Common stock dividends |  |  |  |  | (70) |  |  |  | (70)
Ending balance, March 31, 2023 | $33 |  | $2,807 |  | $970 |  |  |  | $3,810
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $33 |  | $2,807 |  | $929 |  |  |  | $3,769
Net income |  |  |  |  | 87 |  |  |  | 87
Common stock dividends |  |  |  |  | (81) |  |  |  | (81)
Ending balance, March 31, 2022 | $33 |  | $2,807 |  | $935 |  |  |  | $3,775
WPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $66 |  | $2,233 |  | $1,192 |  |  |  | $3,491
Net income |  |  |  |  | 88 |  |  |  | 88
Common stock dividends |  |  |  |  | (46) |  |  |  | (46)
Capital contributions from parent |  |  | 180 |  |  |  |  |  | 180
Ending balance, March 31, 2023 | $66 |  | $2,413 |  | $1,234 |  |  |  | $3,713
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $66 |  | $1,704 |  | $1,053 |  |  |  | $2,823
Net income |  |  |  |  | 92 |  |  |  | 92
Common stock dividends |  |  |  |  | (44) |  |  |  | (44)
Capital contributions from parent |  |  | 180 |  |  |  |  |  | 180
Ending balance, March 31, 2022 | $66 |  | $1,884 |  | $1,101 |  |  |  | $3,051
IPL [Member] |
Common Equity [Line Items] |
Common Equity | COMMON EQUITY Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2023 | 251,134,966 |
Shareowner Direct Plan | 118,488 |
Equity-based compensation plans | 134,334 |
Shares outstanding, March 31, 2023 | 251,387,788 |
Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant Energy |  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  | Total
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  |  |  | Common
| Stock |  | Capital |  | Earnings |  | Loss |  | Trust |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $3 |  | $2,777 |  | $3,509 |  | $— |  | ($13) |  |  |  | $6,276
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 163 |  |  |  |  |  |  |  | 163
Common stock dividends ($0.4525 per share) |  |  |  |  | (113) |  |  |  |  |  |  |  | (113)
Shareowner Direct Plan issuances |  |  | 6 |  |  |  |  |  |  |  |  |  | 6
Equity-based compensation plans and other |  |  | (3) |  |  |  |  |  |  |  |  |  | (3)
Other comprehensive loss, net of tax |  |  |  |  |  |  | (1) |  |  |  |  |  | (1)
Ending balance, March 31, 2023 | $3 |  | $2,780 |  | $3,559 |  | ($1) |  | ($13) |  |  |  | $6,328
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $3 |  | $2,749 |  | $3,250 |  | $— |  | ($12) |  |  |  | $5,990
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 192 |  |  |  |  |  |  |  | 192
Common stock dividends ($0.4275 per share) |  |  |  |  | (107) |  |  |  |  |  |  |  | (107)
Shareowner Direct Plan issuances |  |  | 7 |  |  |  |  |  |  |  |  |  | 7
Equity-based compensation plans and other |  |  | (6) |  | 1 |  |  |  |  |  |  |  | (5)
Ending balance, March 31, 2022 | $3 |  | $2,750 |  | $3,336 |  | $— |  | ($12) |  |  |  | $6,077
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $33 |  | $2,807 |  | $968 |  |  |  | $3,808
Net income |  |  |  |  | 72 |  |  |  | 72
Common stock dividends |  |  |  |  | (70) |  |  |  | (70)
Ending balance, March 31, 2023 | $33 |  | $2,807 |  | $970 |  |  |  | $3,810
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $33 |  | $2,807 |  | $929 |  |  |  | $3,769
Net income |  |  |  |  | 87 |  |  |  | 87
Common stock dividends |  |  |  |  | (81) |  |  |  | (81)
Ending balance, March 31, 2022 | $33 |  | $2,807 |  | $935 |  |  |  | $3,775
WPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $66 |  | $2,233 |  | $1,192 |  |  |  | $3,491
Net income |  |  |  |  | 88 |  |  |  | 88
Common stock dividends |  |  |  |  | (46) |  |  |  | (46)
Capital contributions from parent |  |  | 180 |  |  |  |  |  | 180
Ending balance, March 31, 2023 | $66 |  | $2,413 |  | $1,234 |  |  |  | $3,713
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $66 |  | $1,704 |  | $1,053 |  |  |  | $2,823
Net income |  |  |  |  | 92 |  |  |  | 92
Common stock dividends |  |  |  |  | (44) |  |  |  | (44)
Capital contributions from parent |  |  | 180 |  |  |  |  |  | 180
Ending balance, March 31, 2022 | $66 |  | $1,884 |  | $1,101 |  |  |  | $3,051
WPL [Member] |
Common Equity [Line Items] |
Common Equity | COMMON EQUITY Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2023 | 251,134,966 |
Shareowner Direct Plan | 118,488 |
Equity-based compensation plans | 134,334 |
Shares outstanding, March 31, 2023 | 251,387,788 |
Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant Energy |  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  | Total
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  |  |  | Common
| Stock |  | Capital |  | Earnings |  | Loss |  | Trust |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $3 |  | $2,777 |  | $3,509 |  | $— |  | ($13) |  |  |  | $6,276
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 163 |  |  |  |  |  |  |  | 163
Common stock dividends ($0.4525 per share) |  |  |  |  | (113) |  |  |  |  |  |  |  | (113)
Shareowner Direct Plan issuances |  |  | 6 |  |  |  |  |  |  |  |  |  | 6
Equity-based compensation plans and other |  |  | (3) |  |  |  |  |  |  |  |  |  | (3)
Other comprehensive loss, net of tax |  |  |  |  |  |  | (1) |  |  |  |  |  | (1)
Ending balance, March 31, 2023 | $3 |  | $2,780 |  | $3,559 |  | ($1) |  | ($13) |  |  |  | $6,328
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $3 |  | $2,749 |  | $3,250 |  | $— |  | ($12) |  |  |  | $5,990
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 192 |  |  |  |  |  |  |  | 192
Common stock dividends ($0.4275 per share) |  |  |  |  | (107) |  |  |  |  |  |  |  | (107)
Shareowner Direct Plan issuances |  |  | 7 |  |  |  |  |  |  |  |  |  | 7
Equity-based compensation plans and other |  |  | (6) |  | 1 |  |  |  |  |  |  |  | (5)
Ending balance, March 31, 2022 | $3 |  | $2,750 |  | $3,336 |  | $— |  | ($12) |  |  |  | $6,077
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $33 |  | $2,807 |  | $968 |  |  |  | $3,808
Net income |  |  |  |  | 72 |  |  |  | 72
Common stock dividends |  |  |  |  | (70) |  |  |  | (70)
Ending balance, March 31, 2023 | $33 |  | $2,807 |  | $970 |  |  |  | $3,810
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $33 |  | $2,807 |  | $929 |  |  |  | $3,769
Net income |  |  |  |  | 87 |  |  |  | 87
Common stock dividends |  |  |  |  | (81) |  |  |  | (81)
Ending balance, March 31, 2022 | $33 |  | $2,807 |  | $935 |  |  |  | $3,775
WPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $66 |  | $2,233 |  | $1,192 |  |  |  | $3,491
Net income |  |  |  |  | 88 |  |  |  | 88
Common stock dividends |  |  |  |  | (46) |  |  |  | (46)
Capital contributions from parent |  |  | 180 |  |  |  |  |  | 180
Ending balance, March 31, 2023 | $66 |  | $2,413 |  | $1,234 |  |  |  | $3,713
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $66 |  | $1,704 |  | $1,053 |  |  |  | $2,823
Net income |  |  |  |  | 92 |  |  |  | 92
Common stock dividends |  |  |  |  | (44) |  |  |  | (44)
Capital contributions from parent |  |  | 180 |  |  |  |  |  | 180
Ending balance, March 31, 2022 | $66 |  | $1,884 |  | $1,101 |  |  |  | $3,051

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