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BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Pension Plans
Three Months Ended June 30, 2025 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 23.9 |  |  | $ | 2.2 |  |  | $ | 2.2 |  |  | $ | 3.1 |  |  | $ | 2.3 |  |  | $ | 1.6 |  |  | $ | 1.9 |
Interest Cost |  | 52.8 |  |  | 4.3 |  |  | 6.3 |  |  | 6.2 |  |  | 4.8 |  |  | 2.5 |  |  | 3.0 |
Expected Return on Plan Assets |  | (70.2) |  |  | (5.5) |  |  | (9.4) |  |  | (9.7) |  |  | (7.4) |  |  | (3.8) |  |  | (3.6) |
Amortization of Net Actuarial Loss |  | 4.0 |  |  | 0.4 |  |  | 0.5 |  |  | 0.5 |  |  | 0.4 |  |  | 0.1 |  |  | 0.3 |
Net Periodic Benefit Cost (Credit) |  | $ | 10.5 |  |  | $ | 1.4 |  |  | $ | (0.4) |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | 1.6 |
Three Months Ended June 30, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 25.6 |  |  | $ | 2.2 |  |  | $ | 2.5 |  |  | $ | 3.3 |  |  | $ | 2.3 |  |  | $ | 1.6 |  |  | $ | 2.1 |
Interest Cost |  | 51.9 |  |  | 4.4 |  |  | 6.2 |  |  | 5.9 |  |  | 4.7 |  |  | 2.5 |  |  | 3.1 |
Expected Return on Plan Assets |  | (80.2) |  |  | (6.6) |  |  | (10.7) |  |  | (10.6) |  |  | (8.1) |  |  | (4.4) |  |  | (4.4) |
Amortization of Net Actuarial Loss |  | 1.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | 0.1 |  |  | — |
Net Periodic Benefit Cost (Credit) (a) |  | $ | (1.6) |  |  | $ | 0.1 |  |  | $ | (1.9) |  |  | $ | (1.3) |  |  | $ | (1.1) |  |  | $ | (0.2) |  |  | $ | 0.8 |
Six Months Ended June 30, 2025 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 47.9 |  |  | $ | 4.4 |  |  | $ | 4.6 |  |  | $ | 6.3 |  |  | $ | 4.6 |  |  | $ | 3.0 |  |  | $ | 3.8 |
Interest Cost |  | 105.6 |  |  | 8.8 |  |  | 12.5 |  |  | 12.4 |  |  | 9.7 |  |  | 5.2 |  |  | 6.2 |
Expected Return on Plan Assets |  | (140.5) |  |  | (11.1) |  |  | (18.8) |  |  | (19.4) |  |  | (14.7) |  |  | (7.7) |  |  | (7.3) |
Amortization of Net Actuarial Loss |  | 8.1 |  |  | 0.7 |  |  | 0.9 |  |  | 0.9 |  |  | 0.7 |  |  | 0.3 |  |  | 0.5 |
Net Periodic Benefit Cost (Credit) |  | $ | 21.1 |  |  | $ | 2.8 |  |  | $ | (0.8) |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.8 |  |  | $ | 3.2 |
Six Months Ended June 30, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 51.2 |  |  | $ | 4.4 |  |  | $ | 4.9 |  |  | $ | 6.6 |  |  | $ | 4.7 |  |  | $ | 3.1 |  |  | $ | 4.0 |
Interest Cost |  | 103.8 |  |  | 8.7 |  |  | 12.4 |  |  | 11.9 |  |  | 9.4 |  |  | 5.0 |  |  | 6.2 |
Expected Return on Plan Assets |  | (160.4) |  |  | (13.0) |  |  | (21.4) |  |  | (21.4) |  |  | (16.3) |  |  | (8.7) |  |  | (8.8) |
Amortization of Net Actuarial Loss |  | 2.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Net Periodic Benefit Cost (Credit) (a) |  | $ | (3.2) |  |  | $ | 0.3 |  |  | $ | (3.9) |  |  | $ | (2.7) |  |  | $ | (2.1) |  |  | $ | (0.5) |  |  | $ | 1.5 |
(a)Excludes an immaterial settlement amount to a non-qualified pension plan in the second quarter of 2024 for AEP. See Note 12 - Voluntary Severance Program for additional information. OPEB
Three Months Ended June 30, 2025 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 1.0 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |
Interest Cost |  | 8.6 |  |  | 0.7 |  |  | 1.3 |  |  | 0.9 |  |  | 0.9 |  |  | 0.5 |  |  | 0.6 |
Expected Return on Plan Assets |  | (28.3) |  |  | (2.4) |  |  | (4.1) |  |  | (3.3) |  |  | (3.0) |  |  | (1.5) |  |  | (1.9) |
Amortization of Prior Service Credit |  | (0.6) |  |  | (0.1) |  |  | (0.1) |  |  | (0.1) |  |  | — |  |  | (0.1) |  |  | (0.1) |
Amortization of Net Actuarial Gain |  | (0.3) |  |  | — |  |  | (0.1) |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Credit |  | $ | (19.6) |  |  | $ | (1.7) |  |  | $ | (2.8) |  |  | $ | (2.3) |  |  | $ | (2.0) |  |  | $ | (1.0) |  |  | $ | (1.4) |
Three Months Ended June 30, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 1.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
Interest Cost |  | 10.6 |  |  | 0.8 |  |  | 1.6 |  |  | 1.2 |  |  | 1.0 |  |  | 0.6 |  |  | 0.6 |
Expected Return on Plan Assets |  | (27.9) |  |  | (2.2) |  |  | (4.1) |  |  | (3.3) |  |  | (2.9) |  |  | (1.6) |  |  | (1.8) |
Amortization of Prior Service Credit |  | (3.2) |  |  | (0.2) |  |  | (0.4) |  |  | (0.5) |  |  | (0.3) |  |  | (0.2) |  |  | (0.2) |
Amortization of Net Actuarial Loss |  | 0.7 |  |  | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | — |
Net Periodic Benefit Credit (a) |  | $ | (18.7) |  |  | $ | (1.5) |  |  | $ | (2.7) |  |  | $ | (2.3) |  |  | $ | (2.0) |  |  | $ | (1.1) |  |  | $ | (1.3) |
Six Months Ended June 30, 2025 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 1.8 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest Cost |  | 17.2 |  |  | 1.3 |  |  | 2.7 |  |  | 1.9 |  |  | 1.7 |  |  | 0.9 |  |  | 1.1 |
Expected Return on Plan Assets |  | (56.5) |  |  | (4.7) |  |  | (8.2) |  |  | (6.7) |  |  | (5.9) |  |  | (3.0) |  |  | (3.8) |
Amortization of Prior Service Credit |  | (1.2) |  |  | (0.1) |  |  | (0.2) |  |  | (0.2) |  |  | (0.1) |  |  | (0.1) |  |  | (0.1) |
Amortization of Net Actuarial Gain |  | (0.6) |  |  | — |  |  | (0.2) |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Credit |  | $ | (39.3) |  |  | $ | (3.3) |  |  | $ | (5.6) |  |  | $ | (4.7) |  |  | $ | (4.1) |  |  | $ | (2.1) |  |  | $ | (2.7) |
Six Months Ended June 30, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 2.2 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.2 |
Interest Cost |  | 21.1 |  |  | 1.6 |  |  | 3.3 |  |  | 2.4 |  |  | 2.1 |  |  | 1.1 |  |  | 1.3 |
Expected Return on Plan Assets |  | (55.7) |  |  | (4.5) |  |  | (8.1) |  |  | (6.7) |  |  | (5.9) |  |  | (3.0) |  |  | (3.7) |
Amortization of Prior Service Credit |  | (6.4) |  |  | (0.5) |  |  | (0.9) |  |  | (0.9) |  |  | (0.6) |  |  | (0.4) |  |  | (0.5) |
Amortization of Net Actuarial Loss |  | 1.5 |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |
Net Periodic Benefit Credit (a) |  | $ | (37.3) |  |  | $ | (3.1) |  |  | $ | (5.3) |  |  | $ | (4.7) |  |  | $ | (4.0) |  |  | $ | (2.1) |  |  | $ | (2.6) |
(a)Excludes an immaterial amount related to special termination benefits resulting from the voluntary severance program announced in the second quarter of 2024. See Note 12 - Voluntary Severance Program for additional information.
Qualified Pension Contribution | The following table provides details of the contribution by Registrant:
Company |  | Qualified Pension Plan
|  | (in millions)
AEP |  | $ | 94.7 |
AEP Texas |  | 12.0 |
APCo |  | 0.4 |
I&M |  | 2.1 |
PSO |  | 1.4 |
SWEPCo |  | 8.8 |

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