Property, Plant and Equipment (Tables)

9 Months Ended

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.