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Common Equity
9 Months Ended
Sep. 30, 2022
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, 2022
250,474,529 
Shareowner Direct Plan324,533 
Equity-based compensation plans222,768 
Shares outstanding, September 30, 2022
251,021,830 

Noncontrolling Interest - In the second quarter of 2022, WPL and the tax equity partner contributed to a joint venture associated with certain WPL solar generation projects. The tax equity partner's contributions were represented as a noncontrolling interest within total equity on Alliant Energy’s and WPL’s balance sheets as of June 30, 2022. In the third quarter of 2022, WPL and the tax equity partner terminated the tax equity partnership and WPL returned the tax equity partner’s initial contributions, resulting in the reversal of the noncontrolling interest within total equity on Alliant Energy’s and WPL’s balance sheets as of September 30, 2022. Refer to Note 1(c) for additional information.
Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
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 shareowners227227
Common stock dividends ($0.4275 per share)
(106)(106)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other2(1)1
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$3$2,767$3,508$—($13)$—$6,265
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$3$2,722$3,106($1)($11)$200$6,019
Net income attributable to Alliant Energy common shareowners256256
Common stock dividends ($0.4025 per share)
(101)(101)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other55
Ending balance, September 30, 2021
$3$2,733$3,261($1)($11)$200$6,185
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
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 shareowners579579
Common stock dividends ($1.2825 per share)
(322)(322)
Shareowner Direct Plan issuances1919
Equity-based compensation plans and other(1)1(1)(1)
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$3$2,767$3,508$—($13)$—$6,265
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$2$2,704$2,994($1)($11)$200$5,888
Net income attributable to Alliant Energy common shareowners571571
Common stock dividends ($1.2075 per share)
(304)(304)
Shareowner Direct Plan issuances12122
Equity-based compensation plans and other88
Ending balance, September 30, 2021
$3$2,733$3,261($1)($11)$200$6,185
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022
$33$2,807$942$—$3,782
Net income available for common stock154154
Common stock dividends(80)(80)
Ending balance, September 30, 2022
$33$2,807$1,016$—$3,856
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$33$2,802$944$200$3,979
Net income available for common stock157157
Common stock dividends(101)(101)
Ending balance, September 30, 2021
$33$2,802$1,000$200$4,035
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021
$33$2,807$929$—$3,769
Net income available for common stock327327
Common stock dividends(240)(240)
Ending balance, September 30, 2022
$33$2,807$1,016$—$3,856
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$33$2,752$979$200$3,964
Net income available for common stock322322
Common stock dividends(301)(301)
Capital contributions from parent5050
Ending balance, September 30, 2021
$33$2,802$1,000$200$4,035
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022
$66$1,968$1,120$29$3,183
Net income9191
Common stock dividends(44)(44)
Capital contributions from parent155155
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$66$2,123$1,167$—$3,356
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$66$1,669$990$—$2,725
Net income9393
Common stock dividends(41)(41)
Capital contributions from parent3535
Ending balance, September 30, 2021
$66$1,704$1,042$—$2,812
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021
$66$1,704$1,053$—$2,823
Net income247247
Common stock dividends(133)(133)
Capital contributions from parent420420
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Other(1)(1)
Ending balance, September 30, 2022
$66$2,123$1,167$—$3,356
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$66$1,459$953$—$2,478
Net income215215
Common stock dividends(126)(126)
Capital contributions from parent245245
Ending balance, September 30, 2021
$66$1,704$1,042$—$2,812
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, 2022
250,474,529 
Shareowner Direct Plan324,533 
Equity-based compensation plans222,768 
Shares outstanding, September 30, 2022
251,021,830 

Noncontrolling Interest - In the second quarter of 2022, WPL and the tax equity partner contributed to a joint venture associated with certain WPL solar generation projects. The tax equity partner's contributions were represented as a noncontrolling interest within total equity on Alliant Energy’s and WPL’s balance sheets as of June 30, 2022. In the third quarter of 2022, WPL and the tax equity partner terminated the tax equity partnership and WPL returned the tax equity partner’s initial contributions, resulting in the reversal of the noncontrolling interest within total equity on Alliant Energy’s and WPL’s balance sheets as of September 30, 2022. Refer to Note 1(c) for additional information.
Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
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 shareowners227227
Common stock dividends ($0.4275 per share)
(106)(106)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other2(1)1
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$3$2,767$3,508$—($13)$—$6,265
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$3$2,722$3,106($1)($11)$200$6,019
Net income attributable to Alliant Energy common shareowners256256
Common stock dividends ($0.4025 per share)
(101)(101)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other55
Ending balance, September 30, 2021
$3$2,733$3,261($1)($11)$200$6,185
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
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 shareowners579579
Common stock dividends ($1.2825 per share)
(322)(322)
Shareowner Direct Plan issuances1919
Equity-based compensation plans and other(1)1(1)(1)
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$3$2,767$3,508$—($13)$—$6,265
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$2$2,704$2,994($1)($11)$200$5,888
Net income attributable to Alliant Energy common shareowners571571
Common stock dividends ($1.2075 per share)
(304)(304)
Shareowner Direct Plan issuances12122
Equity-based compensation plans and other88
Ending balance, September 30, 2021
$3$2,733$3,261($1)($11)$200$6,185
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022
$33$2,807$942$—$3,782
Net income available for common stock154154
Common stock dividends(80)(80)
Ending balance, September 30, 2022
$33$2,807$1,016$—$3,856
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$33$2,802$944$200$3,979
Net income available for common stock157157
Common stock dividends(101)(101)
Ending balance, September 30, 2021
$33$2,802$1,000$200$4,035
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021
$33$2,807$929$—$3,769
Net income available for common stock327327
Common stock dividends(240)(240)
Ending balance, September 30, 2022
$33$2,807$1,016$—$3,856
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$33$2,752$979$200$3,964
Net income available for common stock322322
Common stock dividends(301)(301)
Capital contributions from parent5050
Ending balance, September 30, 2021
$33$2,802$1,000$200$4,035
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022
$66$1,968$1,120$29$3,183
Net income9191
Common stock dividends(44)(44)
Capital contributions from parent155155
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$66$2,123$1,167$—$3,356
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$66$1,669$990$—$2,725
Net income9393
Common stock dividends(41)(41)
Capital contributions from parent3535
Ending balance, September 30, 2021
$66$1,704$1,042$—$2,812
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021
$66$1,704$1,053$—$2,823
Net income247247
Common stock dividends(133)(133)
Capital contributions from parent420420
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Other(1)(1)
Ending balance, September 30, 2022
$66$2,123$1,167$—$3,356
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$66$1,459$953$—$2,478
Net income215215
Common stock dividends(126)(126)
Capital contributions from parent245245
Ending balance, September 30, 2021
$66$1,704$1,042$—$2,812
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, 2022
250,474,529 
Shareowner Direct Plan324,533 
Equity-based compensation plans222,768 
Shares outstanding, September 30, 2022
251,021,830 

Noncontrolling Interest - In the second quarter of 2022, WPL and the tax equity partner contributed to a joint venture associated with certain WPL solar generation projects. The tax equity partner's contributions were represented as a noncontrolling interest within total equity on Alliant Energy’s and WPL’s balance sheets as of June 30, 2022. In the third quarter of 2022, WPL and the tax equity partner terminated the tax equity partnership and WPL returned the tax equity partner’s initial contributions, resulting in the reversal of the noncontrolling interest within total equity on Alliant Energy’s and WPL’s balance sheets as of September 30, 2022. Refer to Note 1(c) for additional information.
Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
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 shareowners227227
Common stock dividends ($0.4275 per share)
(106)(106)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other2(1)1
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$3$2,767$3,508$—($13)$—$6,265
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$3$2,722$3,106($1)($11)$200$6,019
Net income attributable to Alliant Energy common shareowners256256
Common stock dividends ($0.4025 per share)
(101)(101)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other55
Ending balance, September 30, 2021
$3$2,733$3,261($1)($11)$200$6,185
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
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 shareowners579579
Common stock dividends ($1.2825 per share)
(322)(322)
Shareowner Direct Plan issuances1919
Equity-based compensation plans and other(1)1(1)(1)
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$3$2,767$3,508$—($13)$—$6,265
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$2$2,704$2,994($1)($11)$200$5,888
Net income attributable to Alliant Energy common shareowners571571
Common stock dividends ($1.2075 per share)
(304)(304)
Shareowner Direct Plan issuances12122
Equity-based compensation plans and other88
Ending balance, September 30, 2021
$3$2,733$3,261($1)($11)$200$6,185
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022
$33$2,807$942$—$3,782
Net income available for common stock154154
Common stock dividends(80)(80)
Ending balance, September 30, 2022
$33$2,807$1,016$—$3,856
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$33$2,802$944$200$3,979
Net income available for common stock157157
Common stock dividends(101)(101)
Ending balance, September 30, 2021
$33$2,802$1,000$200$4,035
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021
$33$2,807$929$—$3,769
Net income available for common stock327327
Common stock dividends(240)(240)
Ending balance, September 30, 2022
$33$2,807$1,016$—$3,856
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$33$2,752$979$200$3,964
Net income available for common stock322322
Common stock dividends(301)(301)
Capital contributions from parent5050
Ending balance, September 30, 2021
$33$2,802$1,000$200$4,035
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022
$66$1,968$1,120$29$3,183
Net income9191
Common stock dividends(44)(44)
Capital contributions from parent155155
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022
$66$2,123$1,167$—$3,356
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021
$66$1,669$990$—$2,725
Net income9393
Common stock dividends(41)(41)
Capital contributions from parent3535
Ending balance, September 30, 2021
$66$1,704$1,042$—$2,812
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021
$66$1,704$1,053$—$2,823
Net income247247
Common stock dividends(133)(133)
Capital contributions from parent420420
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Other(1)(1)
Ending balance, September 30, 2022
$66$2,123$1,167$—$3,356
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020
$66$1,459$953$—$2,478
Net income215215
Common stock dividends(126)(126)
Capital contributions from parent245245
Ending balance, September 30, 2021
$66$1,704$1,042$—$2,812