v3.25.2
Derivative Instruments
6 Months Ended
Jun. 30, 2025
Derivative Instruments [Line Items]  
Derivative Instruments DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Notional Amounts - As of June 30, 2025, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
ElectricityFTRsNatural GasDiesel Fuel
MWhsYearsMWhsYearsDthsYearsGallonsYears
Alliant Energy
1,911 2025-202624,310 2025-2026153,204 2025-20321,260 2025
IPL523 2025-20269,555 2025-202666,568 2025-2030— 
WPL1,388 2025-202614,755 2025-202686,636 2025-20321,260 2025

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):
Alliant EnergyIPLWPL
June 30,
2025
December 31,
2024
June 30,
2025
December 31,
2024
June 30,
2025
December 31,
2024
Current derivative assets$75$41$53$29$22$12
Non-current derivative assets303416191415
Current derivative liabilities23269111415
Non-current derivative liabilities3032322730

During the six months ended June 30, 2025, Alliant Energy’s, IPL’s and WPL’s derivative assets increased primarily due to new FTRs resulting from the annual FTR auction in the second quarter of 2025 operated by MISO. Based on IPL’s and WPL’s cost recovery mechanisms, the changes in the fair value of derivative liabilities/assets result in comparable changes to regulatory assets/liabilities on the balance sheets.

Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. At June 30, 2025 and December 31, 2024, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position was not materially different than amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered.
Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
June 30, 2025
Derivative assets$105$90$69$61$36$29
Derivative liabilities53381244134
December 31, 2024
Derivative assets756448432721
Derivative liabilities58471384539

Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement.
IPL [Member]  
Derivative Instruments [Line Items]  
Derivative Instruments DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Notional Amounts - As of June 30, 2025, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
ElectricityFTRsNatural GasDiesel Fuel
MWhsYearsMWhsYearsDthsYearsGallonsYears
Alliant Energy
1,911 2025-202624,310 2025-2026153,204 2025-20321,260 2025
IPL523 2025-20269,555 2025-202666,568 2025-2030— 
WPL1,388 2025-202614,755 2025-202686,636 2025-20321,260 2025

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):
Alliant EnergyIPLWPL
June 30,
2025
December 31,
2024
June 30,
2025
December 31,
2024
June 30,
2025
December 31,
2024
Current derivative assets$75$41$53$29$22$12
Non-current derivative assets303416191415
Current derivative liabilities23269111415
Non-current derivative liabilities3032322730

During the six months ended June 30, 2025, Alliant Energy’s, IPL’s and WPL’s derivative assets increased primarily due to new FTRs resulting from the annual FTR auction in the second quarter of 2025 operated by MISO. Based on IPL’s and WPL’s cost recovery mechanisms, the changes in the fair value of derivative liabilities/assets result in comparable changes to regulatory assets/liabilities on the balance sheets.

Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. At June 30, 2025 and December 31, 2024, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position was not materially different than amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered.
Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
June 30, 2025
Derivative assets$105$90$69$61$36$29
Derivative liabilities53381244134
December 31, 2024
Derivative assets756448432721
Derivative liabilities58471384539

Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement.
WPL [Member]  
Derivative Instruments [Line Items]  
Derivative Instruments DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Notional Amounts - As of June 30, 2025, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
ElectricityFTRsNatural GasDiesel Fuel
MWhsYearsMWhsYearsDthsYearsGallonsYears
Alliant Energy
1,911 2025-202624,310 2025-2026153,204 2025-20321,260 2025
IPL523 2025-20269,555 2025-202666,568 2025-2030— 
WPL1,388 2025-202614,755 2025-202686,636 2025-20321,260 2025

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):
Alliant EnergyIPLWPL
June 30,
2025
December 31,
2024
June 30,
2025
December 31,
2024
June 30,
2025
December 31,
2024
Current derivative assets$75$41$53$29$22$12
Non-current derivative assets303416191415
Current derivative liabilities23269111415
Non-current derivative liabilities3032322730

During the six months ended June 30, 2025, Alliant Energy’s, IPL’s and WPL’s derivative assets increased primarily due to new FTRs resulting from the annual FTR auction in the second quarter of 2025 operated by MISO. Based on IPL’s and WPL’s cost recovery mechanisms, the changes in the fair value of derivative liabilities/assets result in comparable changes to regulatory assets/liabilities on the balance sheets.

Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. At June 30, 2025 and December 31, 2024, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position was not materially different than amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered.
Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
June 30, 2025
Derivative assets$105$90$69$61$36$29
Derivative liabilities53381244134
December 31, 2024
Derivative assets756448432721
Derivative liabilities58471384539

Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement.