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PROPERTY, PLANT, AND EQUIPMENT - Proportionate Share of Operating Costs (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Utility Plant in Service | $ 1,921.1 | $ 1,906.8
Construction Work in Progress | 4.6 | 11.7
Accumulated Depreciation | 539.0 | 490.8
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Utility Plant in Service | 3,014.6 | 2,993.1
Construction Work in Progress | 5.8 | 14.6
Accumulated Depreciation | $ 637.1 | $ 558.7
Flint Creek Generating Station (Unit No. 1) | Coal |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 50.00% | 50.00%
Utility Plant in Service | $ 404.1 | $ 402.8
Construction Work in Progress | 3.4 | 1.6
Accumulated Depreciation | $ 188.8 | $ 167.5
Flint Creek Generating Station (Unit No. 1) | Coal | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 50.00% | 50.00%
Utility Plant in Service | $ 404.1 | $ 402.8
Construction Work in Progress | 3.4 | 1.6
Accumulated Depreciation | $ 188.8 | $ 167.5
Turk Generating Plant | Coal |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 73.30% | 73.30%
Utility Plant in Service | $ 1,517.0 | $ 1,504.0
Construction Work in Progress | 1.2 | 10.1
Accumulated Depreciation | $ 350.2 | $ 323.3
Turk Generating Plant | Coal | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 73.30% | 73.30%
Utility Plant in Service | $ 1,517.0 | $ 1,504.0
Construction Work in Progress | 1.2 | 10.1
Accumulated Depreciation | $ 350.2 | $ 323.3
Rockport Generating Plant | AEGCo |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 50.00% |
Rockport Generating Plant | Coal | INDIANA MICHIGAN POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 50.00% | 50.00%
Utility Plant in Service | $ 1,345.0 | $ 1,341.4
Construction Work in Progress | 10.9 | 7.9
Accumulated Depreciation | $ 1,181.8 | $ 1,018.9
North Central Wind Energy Facilities | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 45.50% |
North Central Wind Energy Facilities | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 54.50% |
North Central Wind Energy Facilities | Wind | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 45.50% | 45.50%
Utility Plant in Service | $ 912.3 | $ 906.3
Construction Work in Progress | 1.0 | 2.4
Accumulated Depreciation | $ 77.6 | $ 54.1
North Central Wind Energy Facilities | Wind | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Property, Plant and Equipment [Line Items] |  |
Percent of Ownership | 54.50% | 54.50%
Utility Plant in Service | $ 1,093.5 | $ 1,086.3
Construction Work in Progress | 1.2 | 2.9
Accumulated Depreciation | $ 98.1 | $ 67.9

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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
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