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Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2023
Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT The disclosure in this note applies to AEP 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. The table below summarizes significant changes to the Registrants ARO recorded in 2023 and should be read in conjunction with the Property, Plant and Equipment note within the 2022 Annual Report. The following is a reconciliation of the aggregate carrying amounts of ARO for AEP and SWEPCo:
Company |  | ARO as of December 31, 2022 |  | Accretion Expense |  | Liabilities Incurred |  | Liabilities Settled |  | Revisions in Cash Flow Estimates |  | ARO as of September 30, 2023
|  | (in millions)
AEP (a)(b)(c)(d)(e)(f) |  | $ | 2,944.9 |  |  | $ | 86.0 |  |  | $ | 12.9 |  |  | $ | (98.1) |  |  | $ | 13.8 |  |  | $ | 2,959.5 |
SWEPCo (a)(c)(d)(e) |  | 282.2 |  |  | 10.0 |  |  | 7.1 |  |  | (37.9) |  |  | 0.4 |  |  | 261.8 |
(a)Includes ARO related to ash disposal facilities. (b)Includes ARO related to nuclear decommissioning costs for the Cook Plant of $2.05 billion and $2 billion as of September 30, 2023 and December 31, 2022, respectively. (c)Includes ARO related to Sabine and DHLC. (d)Includes ARO related to asbestos removal. (e)In 2023, SWEPCo settled $35 million of costs related to closure/reclamation work performed due to the recent retirements of the Pirkey Plant and Dolet Hills Power Station. See “Coal-Fired Generation Plants” section of Note 4 for additional information. (f)In August 2023, AEP completed the sale of its competitive contracted renewables portfolio to a nonaffiliated party and settled ARO liabilities of $31 million. See “Disposition of the Competitive Contracted Renewables Portfolio” 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//1943274/2147480321/958-360-50-6 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//1943274/2147480321/958-360-50-1 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//1943274/2147480321/958-360-50-7 + Details
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