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Leases (Tables)
 12 Months Ended
Dec. 31, 2024
Leases [Line Items]  
Schedule of Lease Details Operating lease details are as follows (dollars in millions):
December 31, 2024December 31, 2023
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Property, plant and equipment, net$22$12$9$23$13$9
Other current liabilities$2$1$1$2$1$1
Other liabilities2011821128
Total operating lease liabilities$22$12$9$23$13$9
Weighted average remaining lease term11 years11 years12 years12 years12 years12 years
Weighted average discount rate4%4%4%4%4%4%
Finance lease details are as follows (dollars in millions):
December 31, 2024December 31, 2023
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Property, plant and equipment, net:
Sheboygan Falls Energy FacilityN/AN/A$74N/AN/A$79
Leased land for solar generation$189$53136$172$33139
$189$53$210$172$33$218
Other current liabilities:
Sheboygan Falls Energy FacilityN/AN/A$7N/AN/A$11
Leased land for solar generation$—$——$—$——
——7——11
Other liabilities:
Sheboygan Falls Energy FacilityN/AN/A71N/AN/A78
Leased land for solar generation1895313617233139
1895320717233217
Total finance lease liabilities$189$53$214$172$33$228
Weighted average remaining lease term31 years28 years28 years33 years29 years27 years
Weighted average discount rate5%5%5%5%5%5%
Alliant EnergyIPLWPL
202420232022202420232022202420232022
Depreciation and amortization expenses$— $1 $— $— $— $— $4 $6 $6 
Interest expense8 6 3 2 1 — 10 8 7 
Total finance lease expense$8 $7 $3 $2 $1 $— $14 $14 $13 
Finance lease liabilities arising from obtaining leased assets, which represent non-cash financing activities, were as follows (in millions):
Alliant EnergyIPLWPL
202420232024202320242023
Finance lease liabilities arising from obtaining leased assets
$20 $34 $20 $33 $— $71 
Schedule of Operating Lease Liability Maturities As of December 31, 2024, expected maturities of lease liabilities were as follows (in millions):
20252026202720282029ThereafterTotalLess: amount representing interestPresent value of minimum lease payments
Operating Leases:
Alliant Energy$3 $3 $3 $3 $2 $14$28$6$22
IPL2 2 1 1 1 815312
WPL1 1 1 1 1 71239
Finance Leases:
Alliant Energy9 9 9 10 10 337384195189
IPL3 3 3 3 3 921075453
WPL17 13 13 13 13 324393179214
Schedule of Finance Lease Liability Maturities As of December 31, 2024, expected maturities of lease liabilities were as follows (in millions):
20252026202720282029ThereafterTotalLess: amount representing interestPresent value of minimum lease payments
Operating Leases:
Alliant Energy$3 $3 $3 $3 $2 $14$28$6$22
IPL2 2 1 1 1 815312
WPL1 1 1 1 1 71239
Finance Leases:
Alliant Energy9 9 9 10 10 337384195189
IPL3 3 3 3 3 921075453
WPL17 13 13 13 13 324393179214
IPL [Member]  
Leases [Line Items]  
Schedule of Lease Details Operating lease details are as follows (dollars in millions):
December 31, 2024December 31, 2023
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Property, plant and equipment, net$22$12$9$23$13$9
Other current liabilities$2$1$1$2$1$1
Other liabilities2011821128
Total operating lease liabilities$22$12$9$23$13$9
Weighted average remaining lease term11 years11 years12 years12 years12 years12 years
Weighted average discount rate4%4%4%4%4%4%
Finance lease details are as follows (dollars in millions):
December 31, 2024December 31, 2023
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Property, plant and equipment, net:
Sheboygan Falls Energy FacilityN/AN/A$74N/AN/A$79
Leased land for solar generation$189$53136$172$33139
$189$53$210$172$33$218
Other current liabilities:
Sheboygan Falls Energy FacilityN/AN/A$7N/AN/A$11
Leased land for solar generation$—$——$—$——
——7——11
Other liabilities:
Sheboygan Falls Energy FacilityN/AN/A71N/AN/A78
Leased land for solar generation1895313617233139
1895320717233217
Total finance lease liabilities$189$53$214$172$33$228
Weighted average remaining lease term31 years28 years28 years33 years29 years27 years
Weighted average discount rate5%5%5%5%5%5%
Alliant EnergyIPLWPL
202420232022202420232022202420232022
Depreciation and amortization expenses$— $1 $— $— $— $— $4 $6 $6 
Interest expense8 6 3 2 1 — 10 8 7 
Total finance lease expense$8 $7 $3 $2 $1 $— $14 $14 $13 
Finance lease liabilities arising from obtaining leased assets, which represent non-cash financing activities, were as follows (in millions):
Alliant EnergyIPLWPL
202420232024202320242023
Finance lease liabilities arising from obtaining leased assets
$20 $34 $20 $33 $— $71 
Schedule of Operating Lease Liability Maturities As of December 31, 2024, expected maturities of lease liabilities were as follows (in millions):
20252026202720282029ThereafterTotalLess: amount representing interestPresent value of minimum lease payments
Operating Leases:
Alliant Energy$3 $3 $3 $3 $2 $14$28$6$22
IPL2 2 1 1 1 815312
WPL1 1 1 1 1 71239
Finance Leases:
Alliant Energy9 9 9 10 10 337384195189
IPL3 3 3 3 3 921075453
WPL17 13 13 13 13 324393179214
Schedule of Finance Lease Liability Maturities As of December 31, 2024, expected maturities of lease liabilities were as follows (in millions):
20252026202720282029ThereafterTotalLess: amount representing interestPresent value of minimum lease payments
Operating Leases:
Alliant Energy$3 $3 $3 $3 $2 $14$28$6$22
IPL2 2 1 1 1 815312
WPL1 1 1 1 1 71239
Finance Leases:
Alliant Energy9 9 9 10 10 337384195189
IPL3 3 3 3 3 921075453
WPL17 13 13 13 13 324393179214
WPL [Member]  
Leases [Line Items]  
Schedule of Lease Details Operating lease details are as follows (dollars in millions):
December 31, 2024December 31, 2023
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Property, plant and equipment, net$22$12$9$23$13$9
Other current liabilities$2$1$1$2$1$1
Other liabilities2011821128
Total operating lease liabilities$22$12$9$23$13$9
Weighted average remaining lease term11 years11 years12 years12 years12 years12 years
Weighted average discount rate4%4%4%4%4%4%
Finance lease details are as follows (dollars in millions):
December 31, 2024December 31, 2023
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Property, plant and equipment, net:
Sheboygan Falls Energy FacilityN/AN/A$74N/AN/A$79
Leased land for solar generation$189$53136$172$33139
$189$53$210$172$33$218
Other current liabilities:
Sheboygan Falls Energy FacilityN/AN/A$7N/AN/A$11
Leased land for solar generation$—$——$—$——
——7——11
Other liabilities:
Sheboygan Falls Energy FacilityN/AN/A71N/AN/A78
Leased land for solar generation1895313617233139
1895320717233217
Total finance lease liabilities$189$53$214$172$33$228
Weighted average remaining lease term31 years28 years28 years33 years29 years27 years
Weighted average discount rate5%5%5%5%5%5%
Alliant EnergyIPLWPL
202420232022202420232022202420232022
Depreciation and amortization expenses$— $1 $— $— $— $— $4 $6 $6 
Interest expense8 6 3 2 1 — 10 8 7 
Total finance lease expense$8 $7 $3 $2 $1 $— $14 $14 $13 
Finance lease liabilities arising from obtaining leased assets, which represent non-cash financing activities, were as follows (in millions):
Alliant EnergyIPLWPL
202420232024202320242023
Finance lease liabilities arising from obtaining leased assets
$20 $34 $20 $33 $— $71 
Schedule of Operating Lease Liability Maturities As of December 31, 2024, expected maturities of lease liabilities were as follows (in millions):
20252026202720282029ThereafterTotalLess: amount representing interestPresent value of minimum lease payments
Operating Leases:
Alliant Energy$3 $3 $3 $3 $2 $14$28$6$22
IPL2 2 1 1 1 815312
WPL1 1 1 1 1 71239
Finance Leases:
Alliant Energy9 9 9 10 10 337384195189
IPL3 3 3 3 3 921075453
WPL17 13 13 13 13 324393179214
Schedule of Finance Lease Liability Maturities As of December 31, 2024, expected maturities of lease liabilities were as follows (in millions):
20252026202720282029ThereafterTotalLess: amount representing interestPresent value of minimum lease payments
Operating Leases:
Alliant Energy$3 $3 $3 $3 $2 $14$28$6$22
IPL2 2 1 1 1 815312
WPL1 1 1 1 1 71239
Finance Leases:
Alliant Energy9 9 9 10 10 337384195189
IPL3 3 3 3 3 921075453
WPL17 13 13 13 13 324393179214