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Common Equity | 9 Months Ended
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Sep. 30, 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 |
At-the-market offering program | 3,569,937 |
Shareowner Direct Plan | 339,850 |
Equity-based compensation plans | 134,334 |
Shares outstanding, September 30, 2023 | 255,179,087 |
At-the-Market Offering Program - In December 2022, Alliant Energy filed a prospectus supplement under which it may sell up to $225 million of its common stock through an at-the-market offering program. As of September 30, 2023, Alliant Energy issued 3,569,937 shares of common stock through this program and received cash proceeds of $183 million, net of $2 million in commissions and fees. The proceeds from the issuances of common stock were used for general corporate purposes. Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant Energy | Total Alliant Energy Common Equity |  |  |  |
|  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  |
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Income |  | Trust |  | Interest |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $3 |  | $2,854 |  | $3,606 |  | $3 |  | ($14) |  | $— |  | $6,452
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 259 |  |  |  |  |  |  |  | 259
Common stock dividends ($0.4525 per share) |  |  |  |  | (115) |  |  |  |  |  |  |  | (115)
At-the-market offering program and Shareowner Direct Plan issuances |  |  | 125 |  |  |  |  |  |  |  |  |  | 125
Equity-based compensation plans and other |  |  | 3 |  |  |  |  |  | 1 |  |  |  | 4
Other comprehensive income, net of tax |  |  |  |  |  |  | 1 |  |  |  |  |  | 1
Ending balance, September 30, 2023 | $3 |  | $2,982 |  | $3,750 |  | $4 |  | ($13) |  | $— |  | $6,726
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $3 |  | $2,759 |  | $3,387 |  | $— |  | ($12) |  | $29 |  | $6,166
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 227 |  |  |  |  |  |  |  | 227
Common stock dividends ($0.4275 per share) |  |  |  |  | (106) |  |  |  |  |  |  |  | (106)
Shareowner Direct Plan issuances |  |  | 6 |  |  |  |  |  |  |  |  |  | 6
Equity-based compensation plans and other |  |  | 2 |  |  |  |  |  | (1) |  |  |  | 1
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $3 |  | $2,767 |  | $3,508 |  | $— |  | ($13) |  | $— |  | $6,265
Alliant Energy | Total Alliant Energy Common Equity |  |  |  |
|  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  |
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Income |  | Trust |  | Interest |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $3 |  | $2,777 |  | $3,509 |  | $— |  | ($13) |  | $— |  | $6,276
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 582 |  |  |  |  |  |  |  | 582
Common stock dividends ($1.3575 per share) |  |  |  |  | (341) |  |  |  |  |  |  |  | (341)
At-the-market offering program and Shareowner Direct Plan issuances |  |  | 201 |  |  |  |  |  |  |  |  |  | 201
Equity-based compensation plans and other |  |  | 4 |  |  |  |  |  |  |  |  |  | 4
Other comprehensive income, net of tax |  |  |  |  |  |  | 4 |  |  |  |  |  | 4
Ending balance, September 30, 2023 | $3 |  | $2,982 |  | $3,750 |  | $4 |  | ($13) |  | $— |  | $6,726
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $3 |  | $2,749 |  | $3,250 |  | $— |  | ($12) |  | $— |  | $5,990
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 579 |  |  |  |  |  |  |  | 579
Common stock dividends ($1.2825 per share) |  |  |  |  | (322) |  |  |  |  |  |  |  | (322)
Shareowner Direct Plan issuances |  |  | 19 |  |  |  |  |  |  |  |  |  | 19
Equity-based compensation plans and other |  |  | (1) |  | 1 |  |  |  | (1) |  |  |  | (1)
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 29 |  | 29
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $3 |  | $2,767 |  | $3,508 |  | $— |  | ($13) |  | $— |  | $6,265
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $33 |  | $2,847 |  | $989 |  |  |  | $3,869
Net income |  |  |  |  | 170 |  |  |  | 170
Common stock dividends |  |  |  |  | (70) |  |  |  | (70)
Capital contributions from parent |  |  | 20 |  |  |  |  |  | 20
Ending balance, September 30, 2023 | $33 |  | $2,867 |  | $1,089 |  |  |  | $3,989
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $33 |  | $2,807 |  | $942 |  |  |  | $3,782
Net income |  |  |  |  | 154 |  |  |  | 154
Common stock dividends |  |  |  |  | (80) |  |  |  | (80)
Ending balance, September 30, 2022 | $33 |  | $2,807 |  | $1,016 |  |  |  | $3,856
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $33 |  | $2,807 |  | $968 |  |  |  | $3,808
Net income |  |  |  |  | 331 |  |  |  | 331
Common stock dividends |  |  |  |  | (210) |  |  |  | (210)
Capital contributions from parent |  |  | 60 |  |  |  |  |  | 60
Ending balance, September 30, 2023 | $33 |  | $2,867 |  | $1,089 |  |  |  | $3,989
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $33 |  | $2,807 |  | $929 |  |  |  | $3,769
Net income |  |  |  |  | 327 |  |  |  | 327
Common stock dividends |  |  |  |  | (240) |  |  |  | (240)
Ending balance, September 30, 2022 | $33 |  | $2,807 |  | $1,016 |  |  |  | $3,856
WPL | Total WPL Common Equity |  |  |  |
|  |  | Additional |  |  |  |  |  |
| Common |  | Paid-In |  | Retained |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Interest |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $66 |  | $2,413 |  | $1,260 |  | $— |  | $3,739
Net income |  |  |  |  | 107 |  |  |  | 107
Common stock dividends |  |  |  |  | (46) |  |  |  | (46)
Capital contributions from parent |  |  | 65 |  |  |  |  |  | 65
Ending balance, September 30, 2023 | $66 |  | $2,478 |  | $1,321 |  | $— |  | $3,865
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $66 |  | $1,968 |  | $1,120 |  | $29 |  | $3,183
Net income |  |  |  |  | 91 |  |  |  | 91
Common stock dividends |  |  |  |  | (44) |  |  |  | (44)
Capital contributions from parent |  |  | 155 |  |  |  |  |  | 155
Distributions to noncontrolling interest |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $66 |  | $2,123 |  | $1,167 |  | $— |  | $3,356
WPL | Total WPL Common Equity |  |  |  |
|  |  | Additional |  |  |  |  |  |
| Common |  | Paid-In |  | Retained |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Interest |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $66 |  | $2,233 |  | $1,192 |  | $— |  | $3,491
Net income |  |  |  |  | 267 |  |  |  | 267
Common stock dividends |  |  |  |  | (138) |  |  |  | (138)
Capital contributions from parent |  |  | 245 |  |  |  |  |  | 245
Ending balance, September 30, 2023 | $66 |  | $2,478 |  | $1,321 |  | $— |  | $3,865
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $66 |  | $1,704 |  | $1,053 |  | $— |  | $2,823
Net income |  |  |  |  | 247 |  |  |  | 247
Common stock dividends |  |  |  |  | (133) |  |  |  | (133)
Capital contributions from parent |  |  | 420 |  |  |  |  |  | 420
Contributions from noncontrolling interest |  |  |  |  |  |  | 29 |  | 29
Distributions to noncontrolling interest |  |  |  |  |  |  | (29) |  | (29)
Other |  |  | (1) |  |  |  |  |  | (1)
Ending balance, September 30, 2022 | $66 |  | $2,123 |  | $1,167 |  | $— |  | $3,356
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 |
At-the-market offering program | 3,569,937 |
Shareowner Direct Plan | 339,850 |
Equity-based compensation plans | 134,334 |
Shares outstanding, September 30, 2023 | 255,179,087 |
At-the-Market Offering Program - In December 2022, Alliant Energy filed a prospectus supplement under which it may sell up to $225 million of its common stock through an at-the-market offering program. As of September 30, 2023, Alliant Energy issued 3,569,937 shares of common stock through this program and received cash proceeds of $183 million, net of $2 million in commissions and fees. The proceeds from the issuances of common stock were used for general corporate purposes. Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant Energy | Total Alliant Energy Common Equity |  |  |  |
|  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  |
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Income |  | Trust |  | Interest |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $3 |  | $2,854 |  | $3,606 |  | $3 |  | ($14) |  | $— |  | $6,452
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 259 |  |  |  |  |  |  |  | 259
Common stock dividends ($0.4525 per share) |  |  |  |  | (115) |  |  |  |  |  |  |  | (115)
At-the-market offering program and Shareowner Direct Plan issuances |  |  | 125 |  |  |  |  |  |  |  |  |  | 125
Equity-based compensation plans and other |  |  | 3 |  |  |  |  |  | 1 |  |  |  | 4
Other comprehensive income, net of tax |  |  |  |  |  |  | 1 |  |  |  |  |  | 1
Ending balance, September 30, 2023 | $3 |  | $2,982 |  | $3,750 |  | $4 |  | ($13) |  | $— |  | $6,726
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $3 |  | $2,759 |  | $3,387 |  | $— |  | ($12) |  | $29 |  | $6,166
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 227 |  |  |  |  |  |  |  | 227
Common stock dividends ($0.4275 per share) |  |  |  |  | (106) |  |  |  |  |  |  |  | (106)
Shareowner Direct Plan issuances |  |  | 6 |  |  |  |  |  |  |  |  |  | 6
Equity-based compensation plans and other |  |  | 2 |  |  |  |  |  | (1) |  |  |  | 1
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $3 |  | $2,767 |  | $3,508 |  | $— |  | ($13) |  | $— |  | $6,265
Alliant Energy | Total Alliant Energy Common Equity |  |  |  |
|  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  |
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Income |  | Trust |  | Interest |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $3 |  | $2,777 |  | $3,509 |  | $— |  | ($13) |  | $— |  | $6,276
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 582 |  |  |  |  |  |  |  | 582
Common stock dividends ($1.3575 per share) |  |  |  |  | (341) |  |  |  |  |  |  |  | (341)
At-the-market offering program and Shareowner Direct Plan issuances |  |  | 201 |  |  |  |  |  |  |  |  |  | 201
Equity-based compensation plans and other |  |  | 4 |  |  |  |  |  |  |  |  |  | 4
Other comprehensive income, net of tax |  |  |  |  |  |  | 4 |  |  |  |  |  | 4
Ending balance, September 30, 2023 | $3 |  | $2,982 |  | $3,750 |  | $4 |  | ($13) |  | $— |  | $6,726
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $3 |  | $2,749 |  | $3,250 |  | $— |  | ($12) |  | $— |  | $5,990
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 579 |  |  |  |  |  |  |  | 579
Common stock dividends ($1.2825 per share) |  |  |  |  | (322) |  |  |  |  |  |  |  | (322)
Shareowner Direct Plan issuances |  |  | 19 |  |  |  |  |  |  |  |  |  | 19
Equity-based compensation plans and other |  |  | (1) |  | 1 |  |  |  | (1) |  |  |  | (1)
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 29 |  | 29
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $3 |  | $2,767 |  | $3,508 |  | $— |  | ($13) |  | $— |  | $6,265
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $33 |  | $2,847 |  | $989 |  |  |  | $3,869
Net income |  |  |  |  | 170 |  |  |  | 170
Common stock dividends |  |  |  |  | (70) |  |  |  | (70)
Capital contributions from parent |  |  | 20 |  |  |  |  |  | 20
Ending balance, September 30, 2023 | $33 |  | $2,867 |  | $1,089 |  |  |  | $3,989
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $33 |  | $2,807 |  | $942 |  |  |  | $3,782
Net income |  |  |  |  | 154 |  |  |  | 154
Common stock dividends |  |  |  |  | (80) |  |  |  | (80)
Ending balance, September 30, 2022 | $33 |  | $2,807 |  | $1,016 |  |  |  | $3,856
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $33 |  | $2,807 |  | $968 |  |  |  | $3,808
Net income |  |  |  |  | 331 |  |  |  | 331
Common stock dividends |  |  |  |  | (210) |  |  |  | (210)
Capital contributions from parent |  |  | 60 |  |  |  |  |  | 60
Ending balance, September 30, 2023 | $33 |  | $2,867 |  | $1,089 |  |  |  | $3,989
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $33 |  | $2,807 |  | $929 |  |  |  | $3,769
Net income |  |  |  |  | 327 |  |  |  | 327
Common stock dividends |  |  |  |  | (240) |  |  |  | (240)
Ending balance, September 30, 2022 | $33 |  | $2,807 |  | $1,016 |  |  |  | $3,856
WPL | Total WPL Common Equity |  |  |  |
|  |  | Additional |  |  |  |  |  |
| Common |  | Paid-In |  | Retained |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Interest |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $66 |  | $2,413 |  | $1,260 |  | $— |  | $3,739
Net income |  |  |  |  | 107 |  |  |  | 107
Common stock dividends |  |  |  |  | (46) |  |  |  | (46)
Capital contributions from parent |  |  | 65 |  |  |  |  |  | 65
Ending balance, September 30, 2023 | $66 |  | $2,478 |  | $1,321 |  | $— |  | $3,865
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $66 |  | $1,968 |  | $1,120 |  | $29 |  | $3,183
Net income |  |  |  |  | 91 |  |  |  | 91
Common stock dividends |  |  |  |  | (44) |  |  |  | (44)
Capital contributions from parent |  |  | 155 |  |  |  |  |  | 155
Distributions to noncontrolling interest |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $66 |  | $2,123 |  | $1,167 |  | $— |  | $3,356
WPL | Total WPL Common Equity |  |  |  |
|  |  | Additional |  |  |  |  |  |
| Common |  | Paid-In |  | Retained |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Interest |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $66 |  | $2,233 |  | $1,192 |  | $— |  | $3,491
Net income |  |  |  |  | 267 |  |  |  | 267
Common stock dividends |  |  |  |  | (138) |  |  |  | (138)
Capital contributions from parent |  |  | 245 |  |  |  |  |  | 245
Ending balance, September 30, 2023 | $66 |  | $2,478 |  | $1,321 |  | $— |  | $3,865
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $66 |  | $1,704 |  | $1,053 |  | $— |  | $2,823
Net income |  |  |  |  | 247 |  |  |  | 247
Common stock dividends |  |  |  |  | (133) |  |  |  | (133)
Capital contributions from parent |  |  | 420 |  |  |  |  |  | 420
Contributions from noncontrolling interest |  |  |  |  |  |  | 29 |  | 29
Distributions to noncontrolling interest |  |  |  |  |  |  | (29) |  | (29)
Other |  |  | (1) |  |  |  |  |  | (1)
Ending balance, September 30, 2022 | $66 |  | $2,123 |  | $1,167 |  | $— |  | $3,356
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 |
At-the-market offering program | 3,569,937 |
Shareowner Direct Plan | 339,850 |
Equity-based compensation plans | 134,334 |
Shares outstanding, September 30, 2023 | 255,179,087 |
At-the-Market Offering Program - In December 2022, Alliant Energy filed a prospectus supplement under which it may sell up to $225 million of its common stock through an at-the-market offering program. As of September 30, 2023, Alliant Energy issued 3,569,937 shares of common stock through this program and received cash proceeds of $183 million, net of $2 million in commissions and fees. The proceeds from the issuances of common stock were used for general corporate purposes. Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant Energy | Total Alliant Energy Common Equity |  |  |  |
|  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  |
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Income |  | Trust |  | Interest |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $3 |  | $2,854 |  | $3,606 |  | $3 |  | ($14) |  | $— |  | $6,452
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 259 |  |  |  |  |  |  |  | 259
Common stock dividends ($0.4525 per share) |  |  |  |  | (115) |  |  |  |  |  |  |  | (115)
At-the-market offering program and Shareowner Direct Plan issuances |  |  | 125 |  |  |  |  |  |  |  |  |  | 125
Equity-based compensation plans and other |  |  | 3 |  |  |  |  |  | 1 |  |  |  | 4
Other comprehensive income, net of tax |  |  |  |  |  |  | 1 |  |  |  |  |  | 1
Ending balance, September 30, 2023 | $3 |  | $2,982 |  | $3,750 |  | $4 |  | ($13) |  | $— |  | $6,726
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $3 |  | $2,759 |  | $3,387 |  | $— |  | ($12) |  | $29 |  | $6,166
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 227 |  |  |  |  |  |  |  | 227
Common stock dividends ($0.4275 per share) |  |  |  |  | (106) |  |  |  |  |  |  |  | (106)
Shareowner Direct Plan issuances |  |  | 6 |  |  |  |  |  |  |  |  |  | 6
Equity-based compensation plans and other |  |  | 2 |  |  |  |  |  | (1) |  |  |  | 1
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $3 |  | $2,767 |  | $3,508 |  | $— |  | ($13) |  | $— |  | $6,265
Alliant Energy | Total Alliant Energy Common Equity |  |  |  |
|  |  |  |  |  |  | Accumulated |  | Shares in |  |  |  |
|  |  | Additional |  |  |  | Other |  | Deferred |  |  |  |
| Common |  | Paid-In |  | Retained |  | Comprehensive |  | Compensation |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Income |  | Trust |  | Interest |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $3 |  | $2,777 |  | $3,509 |  | $— |  | ($13) |  | $— |  | $6,276
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 582 |  |  |  |  |  |  |  | 582
Common stock dividends ($1.3575 per share) |  |  |  |  | (341) |  |  |  |  |  |  |  | (341)
At-the-market offering program and Shareowner Direct Plan issuances |  |  | 201 |  |  |  |  |  |  |  |  |  | 201
Equity-based compensation plans and other |  |  | 4 |  |  |  |  |  |  |  |  |  | 4
Other comprehensive income, net of tax |  |  |  |  |  |  | 4 |  |  |  |  |  | 4
Ending balance, September 30, 2023 | $3 |  | $2,982 |  | $3,750 |  | $4 |  | ($13) |  | $— |  | $6,726
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $3 |  | $2,749 |  | $3,250 |  | $— |  | ($12) |  | $— |  | $5,990
Net income attributable to Alliant Energy common shareowners |  |  |  |  | 579 |  |  |  |  |  |  |  | 579
Common stock dividends ($1.2825 per share) |  |  |  |  | (322) |  |  |  |  |  |  |  | (322)
Shareowner Direct Plan issuances |  |  | 19 |  |  |  |  |  |  |  |  |  | 19
Equity-based compensation plans and other |  |  | (1) |  | 1 |  |  |  | (1) |  |  |  | (1)
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 29 |  | 29
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $3 |  | $2,767 |  | $3,508 |  | $— |  | ($13) |  | $— |  | $6,265
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $33 |  | $2,847 |  | $989 |  |  |  | $3,869
Net income |  |  |  |  | 170 |  |  |  | 170
Common stock dividends |  |  |  |  | (70) |  |  |  | (70)
Capital contributions from parent |  |  | 20 |  |  |  |  |  | 20
Ending balance, September 30, 2023 | $33 |  | $2,867 |  | $1,089 |  |  |  | $3,989
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $33 |  | $2,807 |  | $942 |  |  |  | $3,782
Net income |  |  |  |  | 154 |  |  |  | 154
Common stock dividends |  |  |  |  | (80) |  |  |  | (80)
Ending balance, September 30, 2022 | $33 |  | $2,807 |  | $1,016 |  |  |  | $3,856
IPL |  |  | Additional |  |  |  |  |  | Total
| Common |  | Paid-In |  | Retained |  |  |  | Common
| Stock |  | Capital |  | Earnings |  |  |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $33 |  | $2,807 |  | $968 |  |  |  | $3,808
Net income |  |  |  |  | 331 |  |  |  | 331
Common stock dividends |  |  |  |  | (210) |  |  |  | (210)
Capital contributions from parent |  |  | 60 |  |  |  |  |  | 60
Ending balance, September 30, 2023 | $33 |  | $2,867 |  | $1,089 |  |  |  | $3,989
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $33 |  | $2,807 |  | $929 |  |  |  | $3,769
Net income |  |  |  |  | 327 |  |  |  | 327
Common stock dividends |  |  |  |  | (240) |  |  |  | (240)
Ending balance, September 30, 2022 | $33 |  | $2,807 |  | $1,016 |  |  |  | $3,856
WPL | Total WPL Common Equity |  |  |  |
|  |  | Additional |  |  |  |  |  |
| Common |  | Paid-In |  | Retained |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Interest |  | Equity
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2023 | $66 |  | $2,413 |  | $1,260 |  | $— |  | $3,739
Net income |  |  |  |  | 107 |  |  |  | 107
Common stock dividends |  |  |  |  | (46) |  |  |  | (46)
Capital contributions from parent |  |  | 65 |  |  |  |  |  | 65
Ending balance, September 30, 2023 | $66 |  | $2,478 |  | $1,321 |  | $— |  | $3,865
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, June 30, 2022 | $66 |  | $1,968 |  | $1,120 |  | $29 |  | $3,183
Net income |  |  |  |  | 91 |  |  |  | 91
Common stock dividends |  |  |  |  | (44) |  |  |  | (44)
Capital contributions from parent |  |  | 155 |  |  |  |  |  | 155
Distributions to noncontrolling interest |  |  |  |  |  |  | (29) |  | (29)
Ending balance, September 30, 2022 | $66 |  | $2,123 |  | $1,167 |  | $— |  | $3,356
WPL | Total WPL Common Equity |  |  |  |
|  |  | Additional |  |  |  |  |  |
| Common |  | Paid-In |  | Retained |  | Noncontrolling |  | Total
| Stock |  | Capital |  | Earnings |  | Interest |  | Equity
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2022 | $66 |  | $2,233 |  | $1,192 |  | $— |  | $3,491
Net income |  |  |  |  | 267 |  |  |  | 267
Common stock dividends |  |  |  |  | (138) |  |  |  | (138)
Capital contributions from parent |  |  | 245 |  |  |  |  |  | 245
Ending balance, September 30, 2023 | $66 |  | $2,478 |  | $1,321 |  | $— |  | $3,865
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Beginning balance, December 31, 2021 | $66 |  | $1,704 |  | $1,053 |  | $— |  | $2,823
Net income |  |  |  |  | 247 |  |  |  | 247
Common stock dividends |  |  |  |  | (133) |  |  |  | (133)
Capital contributions from parent |  |  | 420 |  |  |  |  |  | 420
Contributions from noncontrolling interest |  |  |  |  |  |  | 29 |  | 29
Distributions to noncontrolling interest |  |  |  |  |  |  | (29) |  | (29)
Other |  |  | (1) |  |  |  |  |  | (1)
Ending balance, September 30, 2022 | $66 |  | $2,123 |  | $1,167 |  | $— |  | $3,356

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