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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Book Values and Fair Values of Long-term Debt | The book values and fair values of Long-term Debt are summarized in the following table:
|  | September 30, 2025 |  | December 31, 2024
Company |  | Book Value |  | Fair Value |  | Book Value |  | Fair Value
|  | (in millions)
AEP |  | $ | 46,137.6 |  |  | $ | 43,486.2 |  |  | $ | 42,642.8 |  |  | $ | 38,964.7 |
AEP Texas |  | 7,264.5 |  |  | 6,884.4 |  |  | 6,441.6 |  |  | 5,831.4 |
AEPTCo |  | 6,240.4 |  |  | 5,515.5 |  |  | 5,768.1 |  |  | 4,853.1 |
APCo |  | 5,758.1 |  |  | 5,647.6 |  |  | 5,660.3 |  |  | 5,346.0 |
I&M |  | 3,485.1 |  |  | 3,250.1 |  |  | 3,494.3 |  |  | 3,153.8 |
OPCo |  | 3,717.8 |  |  | 3,356.7 |  |  | 3,715.7 |  |  | 3,203.4 |
PSO |  | 3,524.6 |  |  | 3,365.0 |  |  | 2,855.6 |  |  | 2,562.1 |
SWEPCo |  | 3,972.6 |  |  | 3,626.6 |  |  | 3,980.8 |  |  | 3,431.5 |
Schedule of Available-For-Sale Securities | The following is a summary of Other Temporary Investments and Restricted Cash:
|  | September 30, 2025
|  |  |  | Gross |  | Gross |  |
|  |  |  | Unrealized |  | Unrealized |  | Fair
Other Temporary Investments and Restricted Cash |  | Cost |  | Gains |  | Losses |  | Value
|  | (in millions)
Restricted Cash (a) |  | $ | 39.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 39.1 |
Other Cash Deposits |  | 12.2 |  |  | — |  |  | — |  |  | 12.2 |
Fixed Income Securities – Mutual Funds (b) |  | 173.3 |  |  | — |  |  | (2.2) |  |  | 171.1 |
Equity Securities – Mutual Funds |  | 14.1 |  |  | 28.0 |  |  | — |  |  | 42.1 |
Total Other Temporary Investments and Restricted Cash |  | $ | 238.7 |  |  | $ | 28.0 |  |  | $ | (2.2) |  |  | $ | 264.5 |
|  | December 31, 2024
|  |  |  | Gross |  | Gross |  |
|  |  |  | Unrealized |  | Unrealized |  | Fair
Other Temporary Investments and Restricted Cash |  | Cost |  | Gains |  | Losses |  | Value
|  | (in millions)
Restricted Cash (a) |  | $ | 43.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 43.1 |
Other Cash Deposits |  | 13.9 |  |  | — |  |  | — |  |  | 13.9 |
Fixed Income Securities – Mutual Funds (b) |  | 167.2 |  |  | — |  |  | (5.3) |  |  | 161.9 |
Equity Securities – Mutual Funds |  | 12.7 |  |  | 26.9 |  |  | — |  |  | 39.6 |
Total Other Temporary Investments and Restricted Cash |  | $ | 236.9 |  |  | $ | 26.9 |  |  | $ | (5.3) |  |  | $ | 258.5 |
(a)Primarily represents amounts held for the repayment of debt. (b)Primarily short and intermediate maturities which may be sold and do not contain maturity dates. The following is a summary of nuclear trust fund investments:
| September 30, 2025 |  | December 31, 2024
|  |  | Gross |  | Gross |  | Other-Than- |  |  |  | Gross |  | Gross |  | Other-Than-
| Fair |  | Unrealized |  | Unrealized |  | Temporary |  | Fair |  | Unrealized |  | Unrealized |  | Temporary
| Value |  | Gains |  | Losses |  | Impairments |  | Value |  | Gains |  | Losses |  | Impairments
| (in millions)
Cash and Cash Equivalents | $ | 25.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 23.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States Government | 1,385.1 |  |  | 23.0 |  |  | (0.3) |  |  | (15.5) |  |  | 1,322.8 |  |  | 8.2 |  |  | (5.3) |  |  | (20.2) |
Corporate Debt | 352.9 |  |  | 6.0 |  |  | (6.8) |  |  | (7.1) |  |  | 211.3 |  |  | 0.7 |  |  | (9.8) |  |  | (5.8) |
Subtotal Fixed Income Securities | 1,738.0 |  |  | 29.0 |  |  | (7.1) |  |  | (22.6) |  |  | 1,534.1 |  |  | 8.9 |  |  | (15.1) |  |  | (26.0) |
Equity Securities - Domestic (a) | 3,095.9 |  |  | 2,560.0 |  |  | (0.2) |  |  | — |  |  | 2,837.7 |  |  | 2,288.9 |  |  | (0.4) |  |  | — |
Spent Nuclear Fuel and Decommissioning Trusts | $ | 4,858.9 |  |  | $ | 2,589.0 |  |  | $ | (7.3) |  |  | $ | (22.6) |  |  | $ | 4,395.1 |  |  | $ | 2,297.8 |  |  | $ | (15.5) |  |  | $ | (26.0) |
(a) Due to the adoption of ASU 2016-1, Other-Than-Temporary Impairments are no longer applicable to Equity Securities with readily determinable fair values.
Schedule of Fixed Income And Equity Securities Activity | The following table provides the activity for fixed income and equity securities within Other Temporary Investments:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (in millions)
Proceeds from Investment Sales | $ | 0.4 |  |  | $ | 4.5 |  |  | $ | 17.0 |  |  | $ | 7.5 |
Purchases of Investments | 14.0 |  |  | 6.0 |  |  | 20.5 |  |  | 9.0 |
Gross Realized Gains on Investment Sales | — |  |  | 0.4 |  |  | 4.2 |  |  | 0.7 |
Gross Realized Losses on Investment Sales | — |  |  | 0.3 |  |  | 0.5 |  |  | 0.5 |
Schedule of Securities Activity | The following table provides the securities activity within the decommissioning and SNF trusts:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (in millions)
Proceeds from Investment Sales |  | $ | 1,037.8 |  |  | $ | 1,181.9 |  |  | $ | 2,332.2 |  |  | $ | 2,336.0 |
Purchases of Investments |  | 1,056.5 |  |  | 1,201.9 |  |  | 2,386.5 |  |  | 2,389.0 |
Gross Realized Gains on Investment Sales |  | 112.5 |  |  | 108.4 |  |  | 116.8 |  |  | 118.7 |
Gross Realized Losses on Investment Sales |  | 1.5 |  |  | 0.7 |  |  | 4.0 |  |  | 6.1 |
Schedule of Contractual Maturities, Fair Value of Debt Securities | The fair value of fixed income securities held in the nuclear trust funds, summarized by contractual maturities, as of September 30, 2025 was as follows:
| Fair Value of Fixed
| Income Securities
| (in millions)
Within 1 year | $ | 366.1 |
After 1 year through 5 years | 736.7 |
After 5 years through 10 years | 209.0 |
After 10 years | 426.2 |
Total | $ | 1,738.0 |
Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables set forth, by level within the fair value hierarchy, the Registrants’ financial assets and liabilities that were accounted for at fair value on a recurring basis. As required by the accounting guidance for “Fair Value Measurements and Disclosures,” financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Management’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. There have not been any significant changes in management’s valuation techniques. AEP Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Other Temporary Investments and Restricted Cash |  |  |  |  |  |  |  |  |  |
Restricted Cash |  | $ | 25.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 13.2 |  |  | $ | 39.1 |
Other Cash Deposits (a) |  | — |  |  | — |  |  | — |  |  | 12.2 |  |  | 12.2 |
Fixed Income Securities – Mutual Funds |  | 171.1 |  |  | — |  |  | — |  |  | — |  |  | 171.1 |
Equity Securities – Mutual Funds (b) |  | 42.1 |  |  | — |  |  | — |  |  | — |  |  | 42.1 |
Total Other Temporary Investments and Restricted Cash |  | 239.1 |  |  | — |  |  | — |  |  | 25.4 |  |  | 264.5 |
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) (d) |  | 3.6 |  |  | 623.0 |  |  | 458.7 |  |  | (517.0) |  |  | 568.3 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Commodity Hedges (c) |  | — |  |  | 101.0 |  |  | 18.0 |  |  | (14.8) |  |  | 104.2 |
Total Risk Management Assets |  | 3.6 |  |  | 724.0 |  |  | 476.7 |  |  | (531.8) |  |  | 672.5 |
Spent Nuclear Fuel and Decommissioning Trusts |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents (e) |  | 10.7 |  |  | — |  |  | — |  |  | 14.3 |  |  | 25.0 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |
United States Government |  | — |  |  | 1,385.1 |  |  | — |  |  | — |  |  | 1,385.1 |
Corporate Debt |  | — |  |  | 352.9 |  |  | — |  |  | — |  |  | 352.9 |
Subtotal Fixed Income Securities |  | — |  |  | 1,738.0 |  |  | — |  |  | — |  |  | 1,738.0 |
Equity Securities – Domestic (b) |  | 3,095.9 |  |  | — |  |  | — |  |  | — |  |  | 3,095.9 |
Total Spent Nuclear Fuel and Decommissioning Trusts |  | 3,106.6 |  |  | 1,738.0 |  |  | — |  |  | 14.3 |  |  | 4,858.9 |
Total Assets |  | $ | 3,349.3 |  |  | $ | 2,462.0 |  |  | $ | 476.7 |  |  | $ | (492.1) |  |  | $ | 5,795.9 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) (d) |  | $ | 5.3 |  |  | $ | 552.4 |  |  | $ | 148.6 |  |  | $ | (452.5) |  |  | $ | 253.8 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Commodity Hedges (c) |  | — |  |  | 20.7 |  |  | 1.0 |  |  | (14.8) |  |  | 6.9 |
Fair Value Hedges |  | — |  |  | 48.9 |  |  | — |  |  | — |  |  | 48.9 |
Total Risk Management Liabilities |  | $ | 5.3 |  |  | $ | 622.0 |  |  | $ | 149.6 |  |  | $ | (467.3) |  |  | $ | 309.6 |
Assets and Liabilities Measured at Fair Value on a Recurring Basis December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Other Temporary Investments and Restricted Cash |  |  |  |  |  |  |  |  |  |
Restricted Cash |  | $ | 43.1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 43.1 |
Other Cash Deposits (a) |  | — |  |  | — |  |  | — |  |  | 13.9 |  |  | 13.9 |
Fixed Income Securities – Mutual Funds |  | 161.9 |  |  | — |  |  | — |  |  | — |  |  | 161.9 |
Equity Securities – Mutual Funds (b) |  | 39.6 |  |  | — |  |  | — |  |  | — |  |  | 39.6 |
Total Other Temporary Investments and Restricted Cash |  | 244.6 |  |  | — |  |  | — |  |  | 13.9 |  |  | 258.5 |
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) (f) |  | 2.9 |  |  | 597.3 |  |  | 291.6 |  |  | (517.2) |  |  | 374.6 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Commodity Hedges (c) |  | — |  |  | 115.6 |  |  | 21.9 |  |  | (12.6) |  |  | 124.9 |
Total Risk Management Assets |  | 2.9 |  |  | 712.9 |  |  | 313.5 |  |  | (529.8) |  |  | 499.5 |
Spent Nuclear Fuel and Decommissioning Trusts |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents (e) |  | 9.6 |  |  | — |  |  | — |  |  | 13.7 |  |  | 23.3 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |
United States Government |  | — |  |  | 1,322.8 |  |  | — |  |  | — |  |  | 1,322.8 |
Corporate Debt |  | — |  |  | 211.3 |  |  | — |  |  | — |  |  | 211.3 |
Subtotal Fixed Income Securities |  | — |  |  | 1,534.1 |  |  | — |  |  | — |  |  | 1,534.1 |
Equity Securities – Domestic (b) |  | 2,837.7 |  |  | — |  |  | — |  |  | — |  |  | 2,837.7 |
Total Spent Nuclear Fuel and Decommissioning Trusts |  | 2,847.3 |  |  | 1,534.1 |  |  | — |  |  | 13.7 |  |  | 4,395.1 |
Total Assets |  | $ | 3,094.8 |  |  | $ | 2,247.0 |  |  | $ | 313.5 |  |  | $ | (502.2) |  |  | $ | 5,153.1 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) (f) |  | $ | 4.4 |  |  | $ | 534.1 |  |  | $ | 147.7 |  |  | $ | (433.6) |  |  | $ | 252.6 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Commodity Hedges (c) |  | — |  |  | 12.6 |  |  | 0.2 |  |  | (12.6) |  |  | 0.2 |
Fair Value Hedges |  | — |  |  | 71.6 |  |  | — |  |  | — |  |  | 71.6 |
Total Risk Management Liabilities |  | $ | 4.4 |  |  | $ | 618.3 |  |  | $ | 147.9 |  |  | $ | (446.2) |  |  | $ | 324.4 |
AEP Texas Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Restricted Cash for Securitized Funding |  | $ | 7.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 7.3 |
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Total Assets |  | $ | 7.3 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.4 |
December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Restricted Cash for Securitized Funding |  | $ | 23.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 23.5 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | (0.3) |  |  | $ | — |
APCo Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Restricted Cash for Securitized Funding |  | $ | 10.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 10.8 |
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | — |  |  | 5.3 |  |  | 91.4 |  |  | (2.6) |  |  | 94.1 |
Total Assets |  | $ | 10.8 |  |  | $ | 5.3 |  |  | $ | 91.4 |  |  | $ | (2.6) |  |  | $ | 104.9 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 5.2 |  |  | $ | 0.1 |  |  | $ | (2.6) |  |  | $ | 2.7 |
December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Restricted Cash for Securitized Funding |  | $ | 16.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 16.2 |
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | — |  |  | 6.5 |  |  | 35.2 |  |  | (4.6) |  |  | 37.1 |
Total Assets |  | $ | 16.2 |  |  | $ | 6.5 |  |  | $ | 35.2 |  |  | $ | (4.6) |  |  | $ | 53.3 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 6.9 |  |  | $ | — |  |  | $ | (4.7) |  |  | $ | 2.2 |
I&M Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 8.5 |  |  | $ | 11.3 |  |  | $ | (8.9) |  |  | $ | 10.9 |
Spent Nuclear Fuel and Decommissioning Trusts |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents (e) |  | 10.7 |  |  | — |  |  | — |  |  | 14.3 |  |  | 25.0 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |
United States Government |  | — |  |  | 1,385.1 |  |  | — |  |  | — |  |  | 1,385.1 |
Corporate Debt |  | — |  |  | 352.9 |  |  | — |  |  | — |  |  | 352.9 |
Subtotal Fixed Income Securities |  | — |  |  | 1,738.0 |  |  | — |  |  | — |  |  | 1,738.0 |
Equity Securities - Domestic (b) |  | 3,095.9 |  |  | — |  |  | — |  |  | — |  |  | 3,095.9 |
Total Spent Nuclear Fuel and Decommissioning Trusts |  | 3,106.6 |  |  | 1,738.0 |  |  | — |  |  | 14.3 |  |  | 4,858.9 |
Total Assets |  | $ | 3,106.6 |  |  | $ | 1,746.5 |  |  | $ | 11.3 |  |  | $ | 5.4 |  |  | $ | 4,869.8 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 11.8 |  |  | $ | 0.4 |  |  | $ | (11.2) |  |  | $ | 1.0 |
December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 19.9 |  |  | $ | 6.9 |  |  | $ | (8.4) |  |  | $ | 18.4 |
Spent Nuclear Fuel and Decommissioning Trusts |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents (e) |  | 9.6 |  |  | — |  |  | — |  |  | 13.7 |  |  | 23.3 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |
United States Government |  | — |  |  | 1,322.8 |  |  | — |  |  | — |  |  | 1,322.8 |
Corporate Debt |  | — |  |  | 211.3 |  |  | — |  |  | — |  |  | 211.3 |
Subtotal Fixed Income Securities |  | — |  |  | 1,534.1 |  |  | — |  |  | — |  |  | 1,534.1 |
Equity Securities - Domestic (b) |  | 2,837.7 |  |  | — |  |  | — |  |  | — |  |  | 2,837.7 |
Total Spent Nuclear Fuel and Decommissioning Trusts |  | 2,847.3 |  |  | 1,534.1 |  |  | — |  |  | 13.7 |  |  | 4,395.1 |
Total Assets |  | $ | 2,847.3 |  |  | $ | 1,554.0 |  |  | $ | 6.9 |  |  | $ | 5.3 |  |  | $ | 4,413.5 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 9.2 |  |  | $ | 0.5 |  |  | $ | (9.0) |  |  | $ | 0.7 |
OPCo Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Liabilities: |  | (in millions)
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | — |  |  | $ | 44.3 |  |  | $ | — |  |  | $ | 44.3 |
December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Liabilities: |  | (in millions)
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 0.2 |  |  | $ | 47.5 |  |  | $ | (0.2) |  |  | $ | 47.5 |
PSO Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 0.3 |  |  | $ | 68.3 |  |  | $ | (0.5) |  |  | $ | 68.1 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 14.8 |  |  | $ | 3.0 |  |  | $ | (0.5) |  |  | $ | 17.3 |
December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 3.1 |  |  | $ | 20.8 |  |  | $ | (1.9) |  |  | $ | 22.0 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 7.0 |  |  | $ | 0.8 |  |  | $ | (2.0) |  |  | $ | 5.8 |
SWEPCo Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Restricted Cash for Securitized Funding |  | $ | 7.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 7.8 |
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | — |  |  | 0.3 |  |  | 59.4 |  |  | (1.9) |  |  | 57.8 |
Total Assets |  | $ | 7.8 |  |  | $ | 0.3 |  |  | $ | 59.4 |  |  | $ | (1.9) |  |  | $ | 65.6 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 4.5 |  |  | $ | 2.8 |  |  | $ | (1.9) |  |  | $ | 5.4 |
December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total
Assets: |  | (in millions)
Restricted Cash for Securitized Funding |  | $ | 3.4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3.4 |
Risk Management Assets |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | — |  |  | 1.0 |  |  | 18.1 |  |  | (1.0) |  |  | 18.1 |
Total Assets |  | $ | 3.4 |  |  | $ | 1.0 |  |  | $ | 18.1 |  |  | $ | (1.0) |  |  | $ | 21.5 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Risk Management Liabilities |  |  |  |  |  |  |  |  |  |
Risk Management Commodity Contracts (c) |  | $ | — |  |  | $ | 2.8 |  |  | $ | 0.6 |  |  | $ | (1.1) |  |  | $ | 2.3 |
(a)Amounts in “Other’’ column primarily represent cash deposits in bank accounts with financial institutions or third-parties. Level 1 and Level 2 amounts primarily represent investments in money market funds. (b)Amounts represent publicly traded equity securities and equity-based mutual funds. (c)Amounts in “Other’’ column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.’’ (d)The September 30, 2025 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(1) million in 2025 and $(1) million in periods 2026-2028; Level 2 matures $2 million in 2025, $63 million in periods 2026-2028 and $6 million in periods 2029-2030; Level 3 matures $95 million in 2025, $222 million in periods 2026-2028, $15 million in periods 2029-2030 and $(22) million in periods 2031-2034. Risk management commodity contracts are substantially comprised of power contracts. (e)Amounts in “Other’’ column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds. (f)The December 31, 2024 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(1) million in 2025; Level 2 matures $16 million in 2025, $43 million in periods 2026-2028, $4 million in periods 2029-2030; Level 3 matures $106 million in 2025, $45 million in periods 2026-2028, $9 million in periods 2029-2030 and $(16) million in periods 2031-2034. Risk management commodity contracts are substantially comprised of power contracts.
Changes in Fair Value of Net Trading Derivatives and Other Investments | The following tables set forth a reconciliation of changes in the fair value of net trading derivatives classified as Level 3 in the fair value hierarchy:
Three Months Ended September 30, 2025 |  | AEP |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Balance as of June 30, 2025 |  | $ | 382.8 |  |  | $ | 108.3 |  |  | $ | 12.3 |  |  | $ | (47.7) |  |  | $ | 96.9 |  |  | $ | 69.1 |
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b) |  | 44.7 |  |  | 15.6 |  |  | 3.6 |  |  | (0.1) |  |  | 14.1 |  |  | 9.6 |
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (a) |  | 13.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income (c) |  | 1.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements |  | (131.6) |  |  | (34.4) |  |  | (7.1) |  |  | 1.0 |  |  | (45.2) |  |  | (29.9) |
Transfers into Level 3 (d) (e) |  | 7.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (e) |  | (5.2) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Changes in Fair Value Allocated to Regulated Jurisdictions (f) |  | 14.6 |  |  | 1.8 |  |  | 2.1 |  |  | 2.5 |  |  | (0.5) |  |  | 7.8 |
Balance as of September 30, 2025 |  | $ | 327.1 |  |  | $ | 91.3 |  |  | $ | 10.9 |  |  | $ | (44.3) |  |  | $ | 65.3 |  |  | $ | 56.6 |
Three Months Ended September 30, 2024 |  | AEP |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Balance as of June 30, 2024 |  | $ | 288.2 |  |  | $ | 67.8 |  |  | $ | 14.5 |  |  | $ | (43.2) |  |  | $ | 49.4 |  |  | $ | 38.1 |
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b) |  | 60.4 |  |  | 13.4 |  |  | 2.9 |  |  | (0.1) |  |  | 23.2 |  |  | 21.2 |
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (a) |  | (6.9) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income (c) |  | (0.1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements |  | (133.1) |  |  | (26.9) |  |  | (7.9) |  |  | 1.0 |  |  | (46.3) |  |  | (37.7) |
Transfers into Level 3 (d) (e) |  | (0.3) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (e) |  | (0.6) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Changes in Fair Value Allocated to Regulated Jurisdictions (f) |  | (14.5) |  |  | (7.1) |  |  | (0.2) |  |  | (9.3) |  |  | 2.1 |  |  | 2.1 |
Balance as of September 30, 2024 |  | $ | 193.1 |  |  | $ | 47.2 |  |  | $ | 9.3 |  |  | $ | (51.6) |  |  | $ | 28.4 |  |  | $ | 23.7 |
Nine Months Ended September 30, 2025 |  | AEP |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Balance as of December 31, 2024 |  | $ | 165.6 |  |  | $ | 35.2 |  |  | $ | 6.4 |  |  | $ | (47.5) |  |  | $ | 20.0 |  |  | $ | 17.5 |
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b) |  | 155.3 |  |  | 49.4 |  |  | 12.9 |  |  | — |  |  | 37.9 |  |  | 42.2 |
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (a) |  | 31.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income (c) |  | 14.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements |  | (276.9) |  |  | (84.6) |  |  | (19.2) |  |  | 5.3 |  |  | (57.9) |  |  | (59.7) |
Transfers into Level 3 (d) (e) |  | 1.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (e) |  | (3.0) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Changes in Fair Value Allocated to Regulated Jurisdictions (f) |  | 240.0 |  |  | 91.3 |  |  | 10.8 |  |  | (2.1) |  |  | 65.3 |  |  | 56.6 |
Balance as of September 30, 2025 |  | $ | 327.1 |  |  | $ | 91.3 |  |  | $ | 10.9 |  |  | $ | (44.3) |  |  | $ | 65.3 |  |  | $ | 56.6 |
Nine Months Ended September 30, 2024 |  | AEP |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Balance as of December 31, 2023 |  | $ | 139.4 |  |  | $ | 22.4 |  |  | $ | 2.8 |  |  | $ | (50.6) |  |  | $ | 18.6 |  |  | $ | 11.1 |
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b) |  | 90.6 |  |  | 24.1 |  |  | 7.3 |  |  | (0.9) |  |  | 26.2 |  |  | 23.6 |
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (a) |  | 2.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income (c) |  | 1.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements |  | (164.7) |  |  | (46.5) |  |  | (10.0) |  |  | 6.0 |  |  | (44.8) |  |  | (36.0) |
Transfers into Level 3 (d) (e) |  | 6.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (e) |  | 2.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.5 |
Changes in Fair Value Allocated to Regulated Jurisdictions (f) |  | 115.0 |  |  | 47.2 |  |  | 9.2 |  |  | (6.1) |  |  | 28.4 |  |  | 24.5 |
Balance as of September 30, 2024 |  | $ | 193.1 |  |  | $ | 47.2 |  |  | $ | 9.3 |  |  | $ | (51.6) |  |  | $ | 28.4 |  |  | $ | 23.7 |
(a)Included in revenues on the statements of income. (b)Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract. (c)Included in cash flow hedges on the statements of comprehensive income. (d)Represents existing assets or liabilities that were previously categorized as Level 2. (e)Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred. (f)Relates to the net gains (losses) of those contracts that are not reflected on the statements of income. These changes in fair value are recorded as regulatory liabilities for net gains and as regulatory assets for net losses or accounts payable.
Significant Unobservable Inputs for Level 3 | The following tables quantify the significant unobservable inputs used in developing the fair value of Level 3 positions: Significant Unobservable Inputs September 30, 2025
|  |  |  |  |  |  |  | Significant |  | Input/Range
|  | Type of |  | Fair Value | Valuation |  | Unobservable |  |  |  |  |  | Weighted
Company |  | Input |  | Assets |  | Liabilities |  | Technique |  | Input (a) |  | Low |  | High |  | Average (b)
|  |  |  | (in millions) |  |  |  |  |  |  |  |  |  |
AEP |  | Energy Contracts |  | $ | 225.7 |  |  | $ | 141.2 |  |  | Discounted Cash Flow |  | Forward Market Price |  | $ | 2.24 |  |  | $ | 144.31 |  |  | $ | 49.61 |
AEP |  | FTRs |  | 251.0 |  |  | 8.4 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (33.94) |  |  | 45.81 |  |  | (0.06) |
APCo |  | FTRs |  | 91.4 |  |  | 0.1 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (1.01) |  |  | 12.36 |  |  | 2.44 |
I&M |  | FTRs |  | 11.3 |  |  | 0.4 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (0.16) |  |  | 14.70 |  |  | 1.28 |
OPCo |  | Energy Contracts |  | — |  |  | 44.3 |  |  | Discounted Cash Flow |  | Forward Market Price |  | 13.67 |  |  | 78.67 |  |  | 43.36 |
PSO |  | FTRs |  | 68.3 |  |  | 3.0 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (33.94) |  |  | 9.23 |  |  | (6.03) |
SWEPCo |  | FTRs |  | 59.4 |  |  | 2.8 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (33.94) |  |  | 9.23 |  |  | (6.03) |
December 31, 2024
|  |  |  |  |  |  |  | Significant |  | Input/Range
|  | Type of |  | Fair Value | Valuation |  | Unobservable |  |  |  |  |  | Weighted
Company |  | Input |  | Assets |  | Liabilities |  | Technique |  | Input (a) |  | Low |  | High |  | Average (b)
|  |  |  | (in millions) |  |  |  |  |  |  |  |  |  |
AEP |  | Energy Contracts |  | $ | 221.2 |  |  | $ | 144.6 |  |  | Discounted Cash Flow |  | Forward Market Price |  | $ | 2.75 |  |  | $ | 149.30 |  |  | $ | 49.34 |
AEP |  | FTRs |  | 92.3 |  |  | 3.3 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (29.48) |  |  | 19.70 |  |  | 0.24 |
APCo |  | FTRs |  | 35.2 |  |  | — |  |  | Discounted Cash Flow |  | Forward Market Price |  | (0.25) |  |  | 9.32 |  |  | 1.56 |
I&M |  | FTRs |  | 6.9 |  |  | 0.5 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (4.07) |  |  | 9.32 |  |  | 1.34 |
OPCo |  | Energy Contracts |  | — |  |  | 47.5 |  |  | Discounted Cash Flow |  | Forward Market Price |  | 14.53 |  |  | 72.40 |  |  | 42.44 |
PSO |  | FTRs |  | 20.8 |  |  | 0.8 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (29.48) |  |  | 10.54 |  |  | (3.88) |
SWEPCo |  | FTRs |  | 18.1 |  |  | 0.6 |  |  | Discounted Cash Flow |  | Forward Market Price |  | (29.48) |  |  | 10.54 |  |  | (3.88) |
(a)Represents market prices in dollars per MWh. (b)The weighted average is the product of the forward market price of the underlying commodity and volume weighted by term.
Schedule of Sensitivity of Fair Value Measurements | The following table provides the measurement uncertainty of fair value measurements to increases (decreases) in significant unobservable inputs related to Energy Contracts and FTRs for the Registrants as of September 30, 2025 and December 31, 2024:
Significant Unobservable Input |  | Position |  | Change in Input |  | Impact on Fair Value Measurement
Forward Market Price |  | Buy |  | Increase (Decrease) |  | Higher (Lower)
Forward Market Price |  | Sell |  | Increase (Decrease) |  | Lower (Higher)

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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