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RATE MATTERS - Regulatory Assets Pending Final Approval (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | $ 4,870.2 | $ 5,129.2
Regulatory assets, current | 547.4 | 445.9
AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 383.3 | 353.6
Requested annual base rate increase | 43.0 |
APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 1,451.3 | 1,366.0
Regulatory assets, current | 128.3 | 148.1
I&M |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 616.1 | 548.1
Regulatory assets, current | 5.0 | 10.6
OPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 364.1 | 379.1
PSO |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 551.9 | 527.8
Regulatory assets, current | 139.0 | 64.7
SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 944.9 | 921.3
Regulatory assets, current | 109.6 | 106.6
Total Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 1,527.9 | 1,348.0
Total Regulatory Assets Pending Final Regulatory Approval | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 127.3 | 77.1
Total Regulatory Assets Pending Final Regulatory Approval | APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 658.4 | 535.5
Total Regulatory Assets Pending Final Regulatory Approval | I&M |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 108.8 | 115.0
Total Regulatory Assets Pending Final Regulatory Approval | OPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 0.7 | 0.5
Total Regulatory Assets Pending Final Regulatory Approval | PSO |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 61.5 | 30.3
Total Regulatory Assets Pending Final Regulatory Approval | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 540.5 | 491.4
Welsh Plant, Units 1 and 3 Accelerated Depreciation | Regulatory Assets Currently Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 192.7 | 168.6
Welsh Plant, Units 1 and 3 Accelerated Depreciation | Regulatory Assets Currently Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 192.7 | 168.6
Pirkey Plant Accelerated Depreciation | Regulatory Assets Currently Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 132.6 | 121.3
Pirkey Plant Accelerated Depreciation | Regulatory Assets Currently Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 132.6 | 121.3
Unrecovered Winter Storm Fuel Costs | Regulatory Assets Currently Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 55.9 | 70.7
Unrecovered Winter Storm Fuel Costs | Regulatory Assets Currently Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 55.9 | 70.7
Regulatory assets, current | 37.0 | 37.0
Storm-Related Costs | Regulatory Assets Currently Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 53.8 | 51.0
Storm-Related Costs | Regulatory Assets Currently Earning a Return | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 41.3 | 41.3
Storm-Related Costs | Regulatory Assets Currently Not Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 310.5 | 300.8
Storm-Related Costs | Regulatory Assets Currently Not Earning a Return | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 30.9 | 13.1
Storm-Related Costs | Regulatory Assets Currently Not Earning a Return | APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 163.2 | 144.2
Storm-Related Costs | Regulatory Assets Currently Not Earning a Return | I&M |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 24.0 | 6.3
Storm-Related Costs | Regulatory Assets Currently Not Earning a Return | PSO |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 21.3 | 4.9
Storm-Related Costs | Regulatory Assets Currently Not Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 45.9 | 39.9
AEP Texas House Bill 5247 | Regulatory Assets Currently Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 25.0 | 0.0
AEP Texas House Bill 5247 | Regulatory Assets Currently Earning a Return | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 25.0 | 0.0
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 26.5 | 20.7
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Earning a Return | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 1.2 | 0.0
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Earning a Return | APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 1.3 | 1.1
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Earning a Return | I&M |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 6.7 | 6.4
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Earning a Return | OPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 0.7 | 0.4
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 17.1 | 10.8
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Not Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 107.3 | 86.3
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Not Earning a Return | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 1.4 | 1.3
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Not Earning a Return | APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 20.9 | 11.9
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Not Earning a Return | I&M |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 1.9 | 1.6
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Not Earning a Return | OPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 0.0 | 0.1
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Not Earning a Return | PSO |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 9.5 | 1.2
Other Regulatory Assets Pending Final Regulatory Approval | Regulatory Assets Currently Not Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 18.7 | 18.7
Plant Retirement Costs – Asset Retirement Obligation Costs | Regulatory Assets Currently Not Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 378.3 | 357.4
Plant Retirement Costs – Asset Retirement Obligation Costs | Regulatory Assets Currently Not Earning a Return | APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 299.4 | 282.1
Plant Retirement Costs – Asset Retirement Obligation Costs | Regulatory Assets Currently Not Earning a Return | I&M |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 76.2 | 74.0
2024-2025 Virginia Biennial Under-Earnings | Regulatory Assets Currently Not Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 156.5 | 78.4
2024-2025 Virginia Biennial Under-Earnings | Regulatory Assets Currently Not Earning a Return | APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 156.5 | 78.4
NOLC Costs | Regulatory Assets Currently Not Earning a Return |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 88.8 | 92.8
NOLC Costs | Regulatory Assets Currently Not Earning a Return | I&M |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 0.0 | 26.7
NOLC Costs | Regulatory Assets Currently Not Earning a Return | PSO |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 23.2 | 16.4
NOLC Costs | Regulatory Assets Currently Not Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 65.6 | 49.6
Deferred Pension and OPEB Costs | Regulatory Assets Currently Not Earning a Return | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 21.7 | 15.6
Line Inspection Costs | Regulatory Assets Currently Not Earning a Return | AEP Texas |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 5.8 | 5.8
Pension Settlement | Regulatory Assets Currently Not Earning a Return | APCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 17.1 | 17.8
Pension Settlement | Regulatory Assets Currently Not Earning a Return | PSO |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | 7.5 | 7.8
Dolet Hills Power Station Accelerated Depreciation | Regulatory Assets Currently Earning a Return | SWEPCo |  |
Regulatory Asset [Line Items] |  |
Noncurrent Regulatory Assets | $ 12.0 | $ 11.8

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