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Property, Plant and Equipment (Tables) | 9 Months Ended
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Sep. 30, 2023
Asset Retirement Obligation (ARO) |
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 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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