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PROPERTY, PLANT AND EQUIPMENT | 9 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT The disclosures in this note apply to AEP, PSO and SWEPCo. Asset Retirement Obligations The Registrants record ARO in accordance with the accounting guidance for “Asset Retirement and Environmental Obligations” for legal obligations for asbestos removal and for the retirement of certain ash disposal facilities, wind farms, solar farms and certain coal mining facilities. AEP records ARO for the decommissioning of the Cook Plant. The table below summarizes significant changes to the Registrants ARO recorded in 2025 and should be read in conjunction with the Property, Plant and Equipment note within the 2024 Annual Report. 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 The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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