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RATE MATTERS - SWEPCo Rate Matters (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2025 USD ($) | Oct. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Apr. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Jan. 31, 2022 USD ($) | Oct. 31, 2020 USD ($) | Jan. 31, 2018 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2024 USD ($) MW | Mar. 31, 2024 USD ($)
Securitization Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitization Bonds |  |  |  |  |  |  |  |  |  |  | $ 368.9 |  |  |  |  | $ 578.0 |
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm related expense |  |  |  |  | $ 44.0 |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of fuel costs |  |  | $ 535.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Turk Generating Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, base load | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |
Public utilities, net maximum capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 650 |
Public utilities, percentage of ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73.00% |
Public utilities, net book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300.0 |
Public utilities, percentage not subject to cost-based rate recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |
Public utilities, percentage subject to cost-based rate recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |
Public utilities, favorable impact |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.0
SOUTHWESTERN ELECTRIC POWER COMPANY | Securitization Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitization Bonds |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  | $ 331.4 |
SOUTHWESTERN ELECTRIC POWER COMPANY | Securitization Bonds | Hurricane |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitization Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 337.0 |
Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.0 |
SOUTHWESTERN ELECTRIC POWER COMPANY | Securitization Bonds | Hurricane Laura And Delta |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitization Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180.0 |
SOUTHWESTERN ELECTRIC POWER COMPANY | Securitization Bonds | Catastrophe Storm Reserve |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitization Bonds |  |  |  |  | $ 150.0 |  |  |  |  |  |  |  |  |  |  | $ 150.0 |
SOUTHWESTERN ELECTRIC POWER COMPANY | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of fuel costs | $ 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Minimum | Turk Generating Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, production amount | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 440 |
SOUTHWESTERN ELECTRIC POWER COMPANY | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of fuel costs | $ 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Maximum | Turk Generating Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, production amount | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 477 |
2012 Texas Base Rate Case | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 reversal of previously recorded regulatory disallowances |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 114.0 |  |
Turk afudc disallowance |  |  |  |  |  |  |  |  |  |  | $ 86.0 |  |  |  |  |  |
Revenue refund provision |  |  |  |  |  |  |  |  |  | $ 160.0 |  |  |  |  |  |  |
Estimated turk afudc refunds, period |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated turk afudc refunds |  | $ 148.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 Texas Base Rate Case | SOUTHWESTERN ELECTRIC POWER COMPANY | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recommended customer refunds |  |  |  | $ 149.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Recommended refund period |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |
2012 Texas Base Rate Case | SOUTHWESTERN ELECTRIC POWER COMPANY | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recommended customer refunds |  |  |  | $ 197.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Recommended refund period |  |  |  | 48 months |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Texas Base Rate Case | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested net increase in texas annual revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 69.0 |  |  |
Requested return on equity |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Approved net increase in texas annual revenues |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |  |  |  |
Approved return on equity |  |  |  |  |  |  |  |  | 9.60% |  |  |  |  |  |  |  |
Approved additional vegetation management expenses |  |  |  |  |  |  |  |  | $ 2.0 |  |  |  |  |  |  |  |
Impairment charge total |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.0 |  |  |  |
Impairment charge welsh plant, unit 2 |  |  |  |  |  |  |  |  |  |  |  |  | 7.0 |  |  |  |
Impairment charge disallowed plant investments |  |  |  |  |  |  |  |  |  |  |  |  | 12.0 |  |  |  |
Additional revenues recognized to be surcharged to customers |  |  |  |  |  |  |  |  |  |  |  |  | 32.0 |  |  |  |
Additional recognized expenses consisting primarily of depreciation and vegetation management |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.0 |  |  |  |
2020 Texas Base Rate Case | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity |  |  |  |  |  |  | 9.25% |  |  |  |  |  |  |  |  |  |
Impairment charge total |  |  |  |  |  |  |  |  |  |  |  | $ 12.0 |  |  |  |  |
Requested annual increase |  |  |  |  |  |  |  | $ 105.0 |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  |  |  |  | 10.35% |  |  |  |  |  |  |  |  |
Requested net annual increase |  |  |  |  |  |  |  | $ 90.0 |  |  |  |  |  |  |  |  |
Revised requested annual increase |  |  |  |  |  |  |  | 100.0 |  |  |  |  |  |  |  |  |
Revised requested net annual increase |  |  |  |  |  |  |  | $ 85.0 |  |  |  |  |  |  |  |  |
Approved annual revenue increase |  |  |  |  |  |  | $ 39.0 |  |  |  |  |  |  |  |  |  |
Amount of approved increase related to vegetation management |  |  |  |  |  |  | 5.0 |  |  |  |  |  |  |  |  |  |
Amount of approved increase related to storm catastrophe reserve |  |  |  |  |  |  | $ 2.0 |  |  |  |  |  |  |  |  |  |
2021 Louisiana Storm Cost Filing | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved deferred storm costs |  |  |  |  |  | $ 150.0 |  |  |  |  |  |  |  |  |  |  |
Interim WACC |  |  |  |  |  | 3.125% |  |  |  |  |  |  |  |  |  |  |

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