Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2021

Asset Retirement Obligation (ARO)

Company	ARO as of December 31, 2020		Accretion Expense		Liabilities Incurred		Liabilities Settled		Revisions in Cash Flow Estimates		ARO as of September 30, 2021
	(in millions)
AEP (a)(b)(c)(d)	$	2,516.7	$	77.6	$	17.7	$	(27.6)	$	75.1	$	2,659.5
APCo (a)(d)	313.1		9.9		—		(5.8)		84.7		401.9

(a)Includes ARO related to ash disposal facilities.

(b)Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.85 billion and $1.80 billion as of September 30, 2021 and December 31, 2020, respectively.

(c)Includes ARO related to Sabine and DHLC.

(d)Includes ARO related to asbestos removal.