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RATE MATTERS - APCo and WPCo Rate Matters (Details) - APPALACHIAN POWER COMPANY customer in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2024 USD ($) consecutiveYear | Sep. 30, 2024 USD ($) customer | Aug. 31, 2024 USD ($) | Apr. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Jan. 31, 2025 USD ($) | Feb. 29, 2024 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public utilities, customer outages | customer |  | 260 |  |  |  |  |  |  |
Incremental other operation and maintenance expenses |  |  |  |  |  |  | $ 98.0 |  |
Virginia |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Incremental other operation and maintenance expenses |  |  |  |  |  |  | 72.0 |  |
West Virginia |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Incremental other operation and maintenance expenses |  |  |  |  |  |  | $ 26.0 |  |
ENEC Filing |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Under recovered costs disallowance |  |  |  |  |  | $ 232.0 |  |  | $ 232.0
Approved recovery under recovered costs |  |  |  | $ 321.0 |  | $ 321.0 |  |  |
Approved carrying charges |  |  |  | 4.00% |  | 4.00% |  |  |
Approved carrying charges, recovery period |  |  |  | 10 years |  | 10 years |  |  |
Requested annual base rate increase |  |  |  | $ 58.0 |  |  |  |  |
ENEC Filing | Period ending February 29, 2024 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual base rate increase |  |  |  | 20.0 |  |  |  |  |
Approved annual base rate increase |  |  | $ 20.0 |  |  |  |  |  |
ENEC Filing | Period September 2024 through August 2025 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual base rate increase |  |  |  | $ 38.0 |  |  |  |  |
Approved annual base rate increase |  |  | $ 38.0 |  |  |  |  |  |
ENEC Filing | APCo Portion |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Under recovered costs disallowance |  |  |  |  |  | $ 136.0 |  |  |
Approved recovery under recovered costs |  |  |  |  |  | $ 174.0 |  |  |
Virginia Fuel Adjustment Clause | Subsequent Event |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Under recovered costs disallowance |  |  |  |  |  |  |  | $ 20.0 |
2024 Virginia Base Rate Case |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual base rate increase |  | $ 64.0 |  |  | $ 95.0 |  |  |  |
Approved annual base rate increase | $ 10.0 |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.80% |  |  |  |
Requested debt capital structure |  |  |  |  | 51.00% |  |  |  |
Requested equity capital structure |  |  |  |  | 49.00% |  |  |  |
Approved return on equity | 9.75% |  |  |  |  |  |  |  |
2024 Virginia Base Rate Case, Environmental Compliance Consumable Expenses |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual base rate increase |  | $ 45.0 |  |  |  |  |  |  |
2024 West Virginia Base Rate Case |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual base rate increase | $ 251.0 |  |  |  |  |  |  |  |
Requested return on equity | 10.80% |  |  |  |  |  |  |  |
Requested debt capital structure | 52.00% |  |  |  |  |  |  |  |
Requested equity capital structure | 48.00% |  |  |  |  |  |  |  |
Modified Rate Base Cost |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual base rate increase | $ 94.0 |  |  |  |  |  |  |  |
Mitchell Base Rate Surcharge |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved recovery under recovered costs | 118.0 |  |  |  |  |  |  |  |
Requested annual base rate increase | 21.0 |  |  |  |  |  |  |  |
Regulatory assets expected to be recovered through securitization | 2,400.0 |  |  |  |  |  |  |  |
Requested annual increase without securitization | $ 37.0 |  |  |  |  |  |  |  |
Annual increase april 1st surcharge | 3.00% |  |  |  |  |  |  |  |
Annual increase, surcharges, number of consecutive years | consecutiveYear | 4 |  |  |  |  |  |  |  |
Annual increase april 1st surcharge, proposed filing period | 4 years |  |  |  |  |  |  |  |
West Virginia Modified Rate Base Cost |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual base rate increase |  |  |  |  | $ 32.0 |  |  |  |

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