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PROPERTY, PLANT AND EQUIPMENT (Tables) | 9 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following is a reconciliation of the aggregate carrying amounts of ARO for AEP, PSO and SWEPCo:
Company |  | ARO as of December 31, 2024 |  | Accretion Expense |  | Liabilities Incurred |  | Liabilities Settled |  | Revisions in Cash Flow Estimates (a) |  | ARO as of September 30, 2025
|  | (in millions)
AEP (b)(c)(d)(e)(f)(g) |  | $ | 3,611.7 |  |  | $ | 127.4 |  |  | $ | 21.2 |  |  | $ | (68.3) |  |  | $ | 36.2 |  |  | $ | 3,728.2 |
PSO (b)(e)(f)(g) |  | 121.8 |  |  | 5.7 |  |  | 19.3 |  |  | (1.9) |  |  | (2.8) |  |  | 142.1 |
SWEPCo (b)(d)(e)(f) |  | 278.7 |  |  | 12.7 |  |  | — |  |  | (42.4) |  |  | 33.0 |  |  | 282.0 |
(a)Unless discussed above, primarily related to ash ponds, landfills and mine reclamation, generally due to changes in estimated closure area, volumes and/or unit costs. (b)Includes ARO related to ash disposal facilities. (c)Includes ARO related to nuclear decommissioning costs for the Cook Plant. (d)Includes ARO related to Sabine and DHLC. (e)Includes ARO related to asbestos removal. (f)Includes ARO related to renewables. (g)Includes ARO related to incurred ARO liabilities due to the acquisitions of Pixley Solar Energy Facility, Flat Ridge IV Wind Energy Facility and Flat Ridge V Wind Energy Facility. See the “Acquisitions” section of Note 6 for additional information.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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