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