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ALLIANT ENERGY CORP

For the period ended Jun 30, 2025. Filed Aug 8, 2025.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Jun 30, 2025 · Filed Aug 8, 2025

LNT$73.46+1.1%Stored close · as of Nov 9, 2026

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. Fair Value Measurements

NOTE 11. FAIR VALUE MEASUREMENTS

Fair Value of Financial Instruments - The carrying amounts of current assets and current liabilities approximate fair value because of the short maturity of such financial instruments. Carrying amounts and related estimated fair values of other financial instruments were as follows (in millions):

Alliant Energy · June 30, 2025 · December 31, 2024
Fair Value · Fair Value
Carrying · Level · Level · Level · Carrying · Level · Level · Level
Amount123TotalAmount123Total
Assets:
Money market fund investments and time deposits$303$303$—$—$303$52$52$—$—$52
Commodity derivatives105—485710575—482775
Deferred proceeds235——235235163——163163
Liabilities:
Commodity derivatives53—5215358—56258
Long-term debt (incl. current maturities)11,015—10,617—10,6179,848—9,577—9,577
IPL · June 30, 2025 · December 31, 2024
Fair Value · Fair Value
Carrying · Level · Level · Level · Carrying · Level · Level · Level
Amount123TotalAmount123Total
Assets:
Money market fund investments and time deposits$194$194$—$—$194$9$9$—$—$9
Commodity derivatives69—24456948—262248
Deferred proceeds235——235235163——163163
Liabilities:
Commodity derivatives12—1111213—11213
Long-term debt (incl. current maturities)4,684—4,408—4,4084,090—3,736—3,736
WPL · June 30, 2025 · December 31, 2024
Fair Value · Fair Value
Carrying · Level · Level · Level · Carrying · Level · Level · Level
Amount123TotalAmount123Total
Assets:
Money market fund investments$—$—$—$—$—$43$43$—$—$43
Commodity derivatives36—24123627—22527
Liabilities:
Commodity derivatives41—41—4145—45—45
Long-term debt3,371—3,238—3,2383,370—3,170—3,170

Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):

Alliant EnergyCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Three Months Ended June 302025202420252024
Beginning balance, April 1$9$7$86$184
Total net gains (losses) included in changes in net assets (realized/unrealized)10(5)——
Purchases5059——
Sales(1)(1)——
Settlements (a)(12)(9)149(13)
Ending balance, June 30$56$51$235$171
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30$10($5)$—$—
Alliant EnergyCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Six Months Ended June 302025202420252024
Beginning balance, January 1$25$24$163$216
Total net gains (losses) included in changes in net assets (realized/unrealized)8(8)——
Purchases5059——
Sales(1)(1)——
Settlements (a)(26)(23)72(45)
Ending balance, June 30$56$51$235$171
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30$8($8)$—$—
IPLCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Three Months Ended June 302025202420252024
Beginning balance, April 1$9$5$86$184
Total net gains (losses) included in changes in net assets (realized/unrealized)6(2)——
Purchases4045——
Sales(1)(1)——
Settlements (a)(10)(7)149(13)
Ending balance, June 30$44$40$235$171
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30$6($2)$—$—
IPLCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Six Months Ended June 302025202420252024
Beginning balance, January 1$20$19$163$216
Total net gains (losses) included in changes in net assets (realized/unrealized)6(6)——
Purchases4045——
Sales(1)(1)——
Settlements (a)(21)(17)72(45)
Ending balance, June 30$44$40$235$171
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30$6($6)$—$—
WPLCommodity Contract Derivative
Assets and (Liabilities), net
Three Months Ended June 3020252024
Beginning balance, April 1$—$2
Total net gains (losses) included in changes in net assets (realized/unrealized)4(3)
Purchases1014
Settlements(2)(2)
Ending balance, June 30$12$11
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30$4($3)
WPLCommodity Contract Derivative
Assets and (Liabilities), net
Six Months Ended June 3020252024
Beginning balance, January 1$5$5
Total net gains (losses) included in changes in net assets (realized/unrealized)2(2)
Purchases1014
Settlements(5)(6)
Ending balance, June 30$12$11
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30$2($2)

(a)Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for expected credit losses associated with the receivables sold and cash amounts received from the receivables sold.

Commodity Contracts -The fair value of FTRs and natural gas commodity contracts categorized as Level 3 was recognized as net derivative assets as follows (in millions):

Alliant EnergyIPLWPL
Excluding FTRsFTRsExcluding FTRsFTRsExcluding FTRsFTRs
June 30, 2025$6$50$6$38$—$12
December 31, 2024—25—20—5
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