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ACQUISITIONS, DISPOSITIONS AND IMPAIRMENTS (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) MW | Sep. 30, 2024 USD ($) | Feb. 29, 2024 USD ($) | Dec. 31, 2023 USD ($) | Aug. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jan. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2024 USD ($) MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2020 property MW | Oct. 31, 2021 USD ($) | Dec. 31, 2019 partnership counterparty joint_venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 142.5 | $ 85.6 | $ 48.8 |  |  |
Loss on the Sale of the Competitive Contracted Renewables Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 92.7 | 0.0 |  |  |
Other than temporary impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 19.0 | 188.0 |  |  |
Kentucky Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 363.0 |  |  |
Useful life |  |  |  |  |  | 30 years |  |  |  |  | 30 years |  |  |  |  |  |  |  |
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | 85.6 | $ 0.0 |  |  |
VIU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind generation MW | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,484 |  |
Enterprise value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,850.0 |
Decrease in expected transaction costs |  |  |  |  |  |  |  |  |  |  | $ 28.0 |  |  |  |  |  |  |  |
Pretax reduction in investment basis |  |  |  |  |  | $ 335.0 |  |  |  |  | 335.0 |  |  |  |  |  |  |  |
VIU | Diversion Wind Energy, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind generation MW | MW | 201 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Property, plant and equipment, gross | $ 423.0 |  |  |  |  |  |  |  |  |  |  |  |  | $ 423.0 |  |  |  |  |
Operating lease | 20.0 |  |  |  |  |  |  |  |  |  |  |  |  | 20.0 |  |  |  |  |
Asset retirement obligations | $ 6.0 |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.0 |  |  |  |  |
VIU | Proceeds for KY Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  |  |  |  |  | $ 2,646.0 |  |  |  |  |  |  |
VIU | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  |  |  |  | 146.0 |  |  |  |  |  |  |  |  |  |  |  |  |
VIU | SOUTHWESTERN ELECTRIC POWER COMPANY | Turk Generating Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  | $ 86.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VIU | SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Power Station |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  | $ 12.0 |  |  |  |  |  |  |  |  |  |
VIU | Traverse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind generation MW | MW |  |  |  |  |  |  |  |  |  |  |  |  |  | 998 |  |  |  |  |
Payments to acquire facilities |  |  |  |  |  |  |  | $ 1,200.0 |  |  |  |  |  |  |  |  |  |  |
VIU | Maverick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind generation MW | MW |  |  |  |  |  |  |  |  |  |  |  |  |  | 287 |  |  |  |  |
VIU | Sundance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind generation MW | MW |  |  |  |  |  |  |  |  |  |  |  |  |  | 199 |  |  |  |  |
VIU | North Central Wind Energy Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Payments to acquire facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000.0 |  |  |  |  |
VIU | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interest acquired | 45.50% |  |  |  |  |  |  |  |  |  |  |  |  | 45.50% |  |  |  |  |
VIU | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interest acquired | 54.50% |  |  |  |  |  |  |  |  |  |  |  |  | 54.50% |  |  |  |  |
Generation & Marketing | Disposal Group, Disposed of by Sale, Not Discontinued Operations | AEP OnSite Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of business |  | $ 318.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation & Marketing | Disposal Group, Disposed of by Sale, Not Discontinued Operations | New Mexico Renewable Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of business |  |  | $ 107.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AEPTHCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,850.0 |
Pretax reduction in investment basis |  |  |  |  |  | $ 335.0 |  |  |  |  | $ 335.0 |  |  |  |  |  |  |  |
AEPTHCo | Proceeds for KY Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  |  |  |  |  | 2,646.0 |  |  |  |  |  |  |
G&M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on the Sale of the Competitive Contracted Renewables Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93.0 |  |  |  |
Gain (loss) on disposal of business, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73.0 |  |  |  |
G&M | New Mexico Renewable Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment |  |  |  |  |  |  |  |  |  | $ 19.0 |  |  |  |  |  |  |  |  |
G&M | BP Wind Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment |  |  |  |  |  |  |  |  |  |  |  | $ 2.0 | $ 186.0 |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Number of tax equity partnerships acquired interests in | partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Number of counterparties with long-term power purchase agreement | counterparty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of non-consolidated joint ventures acquired interests in | joint_venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
G&M | Proceeds of Mineral Rights Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of other assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 116.0 |  |  |  |  |  |
G&M | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Competitive Contracted Renewables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of business |  |  |  |  | $ 1,200.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
G&M | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Proceeds of Mineral Rights Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of acquisition |  |  |  |  |  |  | $ 120.0 |  |  |  |  |  |  |  |  |  |  |  |

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