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PROPERTY, PLANT, AND EQUIPMENT - Total Plant Balances (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Generation | $ 24,694.5 | $ 23,862.7
Transmission | 38,871.9 | 35,903.6
Distribution | 31,061.9 | 28,989.9
Other | 6,544.9 | 5,986.1
CWIP | 6,321.5 | 5,480.6
Less: Accumulated Depreciation | 25,794.0 | 24,093.8
Total Regulated Property, Plant and Equipment - Net | 81,700.7 | 76,129.1
Nonregulated Property, Plant and Equipment - Net | 714.9 | 564.3
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | 82,415.6 | 76,693.4
AEP TEXAS INC. |  |
Property, Plant and Equipment [Line Items] |  |
Generation | 0.0 | 0.0
Transmission | 7,546.2 | 6,812.6
Distribution | 6,250.5 | 5,798.8
Other | 1,172.9 | 1,142.9
CWIP | 1,118.0 | 904.6
Less: Accumulated Depreciation | 2,045.7 | 1,886.7
Total Regulated Property, Plant and Equipment - Net | 14,041.9 | 12,772.2
Nonregulated Property, Plant and Equipment - Net | 1.6 | 1.8
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | 14,043.5 | 12,774.0
AEP TRANSMISSION COMPANY, LLC |  |
Property, Plant and Equipment [Line Items] |  |
Generation | 0.0 | 0.0
Transmission | 14,913.4 | 13,723.9
Distribution | 0.0 | 0.0
Other | 515.9 | 501.2
CWIP | 1,965.4 | 1,563.7
Less: Accumulated Depreciation | 1,578.5 | 1,291.4
Total Regulated Property, Plant and Equipment - Net | 15,816.2 | 14,497.4
Nonregulated Property, Plant and Equipment - Net | 0.3 | 0.3
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | 15,816.5 | 14,497.7
APPALACHIAN POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Generation | 7,272.6 | 7,041.3
Transmission | 5,001.5 | 4,711.8
Distribution | 5,568.5 | 5,176.6
Other | 1,023.9 | 943.7
CWIP | 742.6 | 709.2
Less: Accumulated Depreciation | 6,030.9 | 5,684.0
Total Regulated Property, Plant and Equipment - Net | 13,578.2 | 12,898.6
Nonregulated Property, Plant and Equipment - Net | 34.3 | 32.9
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | 13,612.5 | 12,931.5
INDIANA MICHIGAN POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Generation | 5,438.5 | 5,588.7
Transmission | 1,957.8 | 1,906.4
Distribution | 3,535.0 | 3,254.0
Other | 948.3 | 856.8
CWIP | 330.1 | 294.1
Less: Accumulated Depreciation | 4,607.0 | 4,353.7
Total Regulated Property, Plant and Equipment - Net | 7,602.7 | 7,546.3
Nonregulated Property, Plant and Equipment - Net | 76.6 | 82.7
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | 7,679.3 | 7,629.0
OHIO POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Generation | 0.0 | 0.0
Transmission | 3,663.9 | 3,395.1
Distribution | 7,244.0 | 6,839.4
Other | 1,245.3 | 1,114.4
CWIP | 691.1 | 654.0
Less: Accumulated Depreciation | 2,883.0 | 2,712.7
Total Regulated Property, Plant and Equipment - Net | 9,961.3 | 9,290.2
Nonregulated Property, Plant and Equipment - Net | 9.8 | 9.7
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | 9,971.1 | 9,299.9
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Property, Plant and Equipment [Line Items] |  |
Generation | 2,772.4 | 2,695.5
Transmission | 1,345.3 | 1,228.3
Distribution | 3,698.8 | 3,450.8
Other | 546.8 | 502.7
CWIP | 378.8 | 313.7
Less: Accumulated Depreciation | 2,214.7 | 2,083.6
Total Regulated Property, Plant and Equipment - Net | 6,527.4 | 6,107.4
Nonregulated Property, Plant and Equipment - Net | 4.9 | 4.9
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | 6,532.3 | 6,112.3
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Generation | 5,287.5 | 4,790.7
Transmission | 2,863.8 | 2,660.6
Distribution | 3,007.1 | 2,824.1
Other | 682.7 | 544.1
CWIP | 627.3 | 555.8
Less: Accumulated Depreciation | 3,048.5 | 2,840.8
Total Regulated Property, Plant and Equipment - Net | 9,419.9 | 8,534.5
Nonregulated Property, Plant and Equipment - Net | 26.2 | 23.9
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET | $ 9,446.1 | $ 8,558.4

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