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v3.25.1

BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Pension Plans
Three Months Ended March 31, 2025 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 24.0 |  |  | $ | 2.2 |  |  | $ | 2.4 |  |  | $ | 3.2 |  |  | $ | 2.3 |  |  | $ | 1.4 |  |  | $ | 1.9 |
Interest Cost |  | 52.8 |  |  | 4.5 |  |  | 6.2 |  |  | 6.2 |  |  | 4.9 |  |  | 2.7 |  |  | 3.2 |
Expected Return on Plan Assets |  | (70.3) |  |  | (5.6) |  |  | (9.4) |  |  | (9.7) |  |  | (7.3) |  |  | (3.9) |  |  | (3.7) |
Amortization of Net Actuarial Loss |  | 4.1 |  |  | 0.3 |  |  | 0.4 |  |  | 0.4 |  |  | 0.3 |  |  | 0.2 |  |  | 0.2 |
Net Periodic Benefit Cost (Credit) |  | $ | 10.6 |  |  | $ | 1.4 |  |  | $ | (0.4) |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 1.6 |
Three Months Ended March 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 25.6 |  |  | $ | 2.2 |  |  | $ | 2.4 |  |  | $ | 3.3 |  |  | $ | 2.4 |  |  | $ | 1.5 |  |  | $ | 1.9 |
Interest Cost |  | 51.9 |  |  | 4.3 |  |  | 6.2 |  |  | 6.0 |  |  | 4.7 |  |  | 2.5 |  |  | 3.1 |
Expected Return on Plan Assets |  | (80.2) |  |  | (6.4) |  |  | (10.7) |  |  | (10.8) |  |  | (8.2) |  |  | (4.3) |  |  | (4.4) |
Amortization of Net Actuarial Loss |  | 1.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | 0.1 |
Net Periodic Benefit Cost (Credit) |  | $ | (1.6) |  |  | $ | 0.2 |  |  | $ | (2.0) |  |  | $ | (1.4) |  |  | $ | (1.0) |  |  | $ | (0.3) |  |  | $ | 0.7 |
OPEB
Three Months Ended March 31, 2025 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 0.8 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
Interest Cost |  | 8.6 |  |  | 0.6 |  |  | 1.4 |  |  | 1.0 |  |  | 0.8 |  |  | 0.4 |  |  | 0.5 |
Expected Return on Plan Assets |  | (28.2) |  |  | (2.3) |  |  | (4.1) |  |  | (3.4) |  |  | (2.9) |  |  | (1.5) |  |  | (1.9) |
Amortization of Prior Service Credit |  | (0.6) |  |  | — |  |  | (0.1) |  |  | (0.1) |  |  | (0.1) |  |  | — |  |  | — |
Amortization of Net Actuarial Gain |  | (0.3) |  |  | — |  |  | (0.1) |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Credit |  | $ | (19.7) |  |  | $ | (1.6) |  |  | $ | (2.8) |  |  | $ | (2.4) |  |  | $ | (2.1) |  |  | $ | (1.1) |  |  | $ | (1.3) |
Three Months Ended March 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 1.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest Cost |  | 10.5 |  |  | 0.8 |  |  | 1.7 |  |  | 1.2 |  |  | 1.1 |  |  | 0.5 |  |  | 0.7 |
Expected Return on Plan Assets |  | (27.8) |  |  | (2.3) |  |  | (4.0) |  |  | (3.4) |  |  | (3.0) |  |  | (1.4) |  |  | (1.9) |
Amortization of Prior Service Credit |  | (3.2) |  |  | (0.3) |  |  | (0.5) |  |  | (0.4) |  |  | (0.3) |  |  | (0.2) |  |  | (0.3) |
Amortization of Net Actuarial Loss |  | 0.8 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | 0.1 |
Net Periodic Benefit Credit |  | $ | (18.6) |  |  | $ | (1.6) |  |  | $ | (2.6) |  |  | $ | (2.4) |  |  | $ | (2.0) |  |  | $ | (1.0) |  |  | $ | (1.3) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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