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Regulatory Matters (Tables)
9 Months Ended
Sep. 30, 2021
Regulatory Assets [Line Items]  
Regulatory Assets
Regulatory assets were comprised of the following items (in millions):
Alliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
Tax-related$931$890$881$843$50$47
Pension and OPEB costs549580276291273289
Asset retirement obligations12411985813938
Assets retired early9811369772936
IPL’s DAEC PPA amendment9611096110
WPL’s Western Wisconsin gas distribution expansion investments53555355
Commodity cost recovery324171153
Derivatives42641313
Other13111379675246
$2,018$2,010$1,507$1,483$511$527
Regulatory Liabilities
Regulatory liabilities were comprised of the following items (in millions):
Alliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
Tax-related$611$732$313$331$298$401
Cost of removal obligations383367252238131129
Derivatives22128104251173
Electric transmission cost recovery536829392429
WPL’s West Riverside liquidated damages40384038
Other537322433130
$1,361$1,306$720$676$641$630
IPL [Member]  
Regulatory Assets [Line Items]  
Regulatory Assets
Regulatory assets were comprised of the following items (in millions):
Alliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
Tax-related$931$890$881$843$50$47
Pension and OPEB costs549580276291273289
Asset retirement obligations12411985813938
Assets retired early9811369772936
IPL’s DAEC PPA amendment9611096110
WPL’s Western Wisconsin gas distribution expansion investments53555355
Commodity cost recovery324171153
Derivatives42641313
Other13111379675246
$2,018$2,010$1,507$1,483$511$527
Regulatory Liabilities
Regulatory liabilities were comprised of the following items (in millions):
Alliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
Tax-related$611$732$313$331$298$401
Cost of removal obligations383367252238131129
Derivatives22128104251173
Electric transmission cost recovery536829392429
WPL’s West Riverside liquidated damages40384038
Other537322433130
$1,361$1,306$720$676$641$630
WPL [Member]  
Regulatory Assets [Line Items]  
Regulatory Assets
Regulatory assets were comprised of the following items (in millions):
Alliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
Tax-related$931$890$881$843$50$47
Pension and OPEB costs549580276291273289
Asset retirement obligations12411985813938
Assets retired early9811369772936
IPL’s DAEC PPA amendment9611096110
WPL’s Western Wisconsin gas distribution expansion investments53555355
Commodity cost recovery324171153
Derivatives42641313
Other13111379675246
$2,018$2,010$1,507$1,483$511$527
Regulatory Liabilities
Regulatory liabilities were comprised of the following items (in millions):
Alliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
Tax-related$611$732$313$331$298$401
Cost of removal obligations383367252238131129
Derivatives22128104251173
Electric transmission cost recovery536829392429
WPL’s West Riverside liquidated damages40384038
Other537322433130
$1,361$1,306$720$676$641$630