XML 144 R52.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020


December 31, 2020	AEP			AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Regulated Property, Plant and Equipment
Generation	$	21,587.8	(a)	$	—	$	—	$	6,633.7	$	5,264.7	$	—	$	1,480.7	$	4,681.4	(a)
Transmission	27,841.5			5,279.6		9,593.5		3,900.5		1,696.4		2,831.9		1,069.9		2,165.7
Distribution	23,972.1			4,580.8		—		4,464.3		2,594.6		5,708.3		2,853.0		2,382.5
Other	4,852.4			866.0		328.8		598.0		644.6		888.5		388.1		564.5
CWIP	3,815.0		(a)	614.1		1,422.6		484.6		362.4		362.3		128.7		228.3		(a)
Less: Accumulated Depreciation	20,094.2			1,528.1		572.8		4,711.0		3,538.6		2,348.8		1,607.3		3,032.0
Total Regulated Property, Plant and Equipment - Net	61,974.6			9,812.4		10,772.1		11,370.1		7,024.1		7,442.2		4,313.1		6,990.4
Nonregulated Property, Plant and Equipment - Net	1,927.0			1.2		0.7		24.0		28.2		9.9		6.9		97.8
Total Property, Plant and Equipment - Net	$	63,901.6		$	9,813.6	$	10,772.8	$	11,394.1	$	7,052.3	$	7,452.1	$	4,320.0	$	7,088.2


December 31, 2019	AEP			AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Regulated Property, Plant and Equipment
Generation	$	21,323.5	(a)	$	—	$	—	$	6,563.7	$	5,099.7	$	—	$	1,574.6	$	4,691.4	(a)
Transmission	24,763.4			4,466.5		8,137.9		3,584.1		1,641.8		2,686.3		948.5		2,056.5
Distribution	22,440.8			4,215.2		—		4,201.7		2,437.6		5,323.5		2,684.8		2,270.7
Other	4,369.6			803.4		268.2		542.0		590.9		754.7		337.2		520.6
CWIP	4,261.2		(a)	763.9		1,485.7		593.4		382.3		394.4		133.4		210.1		(a)
Less: Accumulated Depreciation	18,778.1			1,465.0		402.3		4,425.6		3,281.4		2,261.7		1,579.9		2,766.2
Total Regulated Property, Plant and Equipment - Net	58,380.4			8,784.0		9,489.5		11,059.3		6,870.9		6,897.2		4,098.6		6,983.1
Nonregulated Property, Plant and Equipment - Net	1,757.7			61.1		1.4		22.6		28.8		9.8		4.7		112.1
Total Property, Plant and Equipment - Net	$	60,138.1		$	8,845.1	$	9,490.9	$	11,081.9	$	6,899.7	$	6,907.0	$	4,103.3	$	7,095.2

(a)AEP and SWEPCo’s regulated generation and regulated CWIP include amounts related to SWEPCo’s Arkansas jurisdictional share of the Turk Plant.

Depreciation, Depletion and Amortization - Regulated


AEP
	2020						2019						2018
Functional Class of Property	Annual Composite Depreciation Rate Ranges			Depreciable Life Ranges			Annual Composite Depreciation Rate Ranges			Depreciable Life Ranges			Annual Composite Depreciation Rate Ranges			Depreciable Life Ranges
				(in years)						(in years)						(in years)
Generation	2.7%	-	6.3%	20	-	132	2.5%	-	5.5%	20	-	132	2.4%	-	4.0%	20	-	132
Transmission	2.0%	-	2.6%	15	-	75	1.8%	-	2.6%	15	-	81	1.6%	-	2.7%	15	-	81
Distribution	2.7%	-	3.7%	7	-	78	2.7%	-	3.7%	7	-	78	2.7%	-	3.6%	7	-	78
Other	2.8%	-	11.3%	5	-	75	2.6%	-	9.5%	5	-	75	2.3%	-	9.8%	5	-	75


AEP Texas
	2020				2019				2018
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)				(in years)
Transmission	2.0%	50	-	75	1.8%	45	-	81	1.7%	45	-	81
Distribution	3.1%	7	-	70	3.5%	7	-	70	3.6%	7	-	70
Other	6.1%	5	-	50	6.3%	5	-	50	6.0%	5	-	50


AEPTCo
	2020				2019				2018
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)				(in years)
Transmission	2.4%	24	-	75	2.0%	24	-	75	1.9%	20	-	75
Other	6.3%	5	-	64	5.8%	5	-	64	5.6%	5	-	64


APCo
	2020				2019				2018
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)				(in years)
Generation	3.3%	35	-	118	3.2%	35	-	118	3.1%	35	-	112
Transmission	2.2%	15	-	75	1.8%	15	-	71	1.6%	15	-	68
Distribution	3.7%	12	-	57	3.7%	12	-	57	3.6%	10	-	57
Other	7.8%	5	-	55	7.2%	5	-	55	7.4%	5	-	55


I&M
	2020				2019				2018
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)				(in years)
Generation	4.6%	20	-	132	4.0%	20	-	132	3.4%	20	-	132
Transmission	2.3%	45	-	70	1.9%	50	-	73	1.8%	50	-	73
Distribution	3.4%	14	-	71	3.4%	9	-	75	3.1%	9	-	75
Other	10.2%	5	-	51	9.4%	5	-	50	8.9%	5	-	50


OPCo
	2020				2019				2018
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)				(in years)
Transmission	2.3%	39	-	60	2.3%	39	-	60	2.3%	39	-	60
Distribution	3.1%	14	-	65	3.1%	14	-	65	3.0%	14	-	65
Other	5.0%	5	-	50	4.9%	5	-	50	6.3%	5	-	50


PSO
	2020				2019				2018
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)				(in years)
Generation	3.1%	35	-	75	2.9%	35	-	75	2.9%	35	-	75
Transmission	2.2%	45	-	75	2.4%	45	-	75	2.3%	45	-	75
Distribution	2.9%	15	-	78	2.9%	15	-	78	2.9%	15	-	78
Other	5.7%	5	-	64	5.6%	5	-	64	6.3%	5	-	64


SWEPCo
	2020				2019				2018
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)				(in years)
Generation	2.7%	35	-	65	2.5%	40	-	70	2.4%	40	-	70
Transmission	2.3%	47	-	73	2.4%	50	-	73	2.2%	50	-	73
Distribution	2.7%	15	-	67	2.7%	25	-	70	2.7%	25	-	70
Other	8.5%	5	-	52	7.6%	5	-	55	8.0%	5	-	55

Depreciation, Depletion and Amortization - Unregulated


	2020							2019							2018
Functional Class of Property	Annual Composite Depreciation Rate Ranges			Depreciable Life Ranges				Annual Composite Depreciation Rate Ranges			Depreciable Life Ranges				Annual Composite Depreciation Rate Ranges			Depreciable Life Ranges
				(in years)							(in years)							(in years)
Generation	3.6%	-	4.0%	15	-	59		3.2%	-	21.2%	15	-	59		3.4%	-	22.3%	15	-	59
Transmission	2.5%			30	-	40		2.5%			30	-	40		2.4%			40
Distribution	NA			NA				2.3%			40				2.3%			40
Other	16.1%			5	-	50	(a)	17.6%			5	-	50	(a)	16.3%			5	-	50	(a)

(a)SWEPCo’s nonregulated property, plant and equipment is depreciated using the straight-line method over a range of 3 to 20 years.

NA Not applicable.

Asset Retirement Obligation (ARO)


Company	ARO as of December 31, 2019		Accretion Expense		Liabilities Incurred		Liabilities Settled		Revisions in Cash Flow Estimates (a)		ARO as of December 31, 2020
	(in millions)
AEP (b)(c)(d)(e)	$	2,418.9	$	102.4	$	0.3	$	(188.0)	$	183.1	$	2,516.7
AEP Texas (b)(e)	29.1		0.8		—		(8.5)		(16.8)		4.6
APCo (b)(e)	111.1		8.9		—		(7.8)		200.9		313.1
I&M (b)(c)(e)	1,748.6		70.2		0.1		(0.2)		(4.9)		1,813.8
OPCo (e)	1.8		0.1		—		—		—		1.9
PSO (b)(e)	52.2		3.1		—		(3.1)		(4.8)		47.4
SWEPCo (b)(d)(e)	212.2		10.7		—		(10.9)		10.1		222.1


Company	ARO as of December 31, 2018		Accretion Expense		Liabilities Incurred		Liabilities Settled		Revisions in Cash Flow Estimates (a)		ARO as of December 31, 2019
	(in millions)
AEP (b)(c)(d)(e)	$	2,355.5	$	102.5	$	12.0	$	(118.1)	$	67.0	$	2,418.9
AEP Texas (b)(e)	27.9		1.3		—		(0.2)		0.1		29.1
APCo (b)(e)	116.1		5.9		—		(17.6)		6.7		111.1
I&M (b)(c)(e)	1,681.3		67.4		—		(0.2)		0.1		1,748.6
OPCo (e)	1.8		0.1		—		(0.3)		0.2		1.8
PSO (b)(e)	46.9		3.1		—		(0.4)		2.6		52.2
SWEPCo (b)(d)(e)	206.8		10.3		—		(11.8)		6.9		212.2

(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 of $1.80 billion and $1.73 billion as of December 31, 2020 and 2019, respectively.

(d)Includes ARO related to Sabine and DHLC.

(e)Includes ARO related to asbestos removal.

Allowance For Equity Funds Used During Construction


	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
AEP	$	148.1	$	168.4	$	132.5
AEP Texas	19.4		15.2		20.0
AEPTCo	74.0		84.3		70.6
APCo	14.6		16.6		13.2
I&M	11.5		19.4		11.9
OPCo	12.5		18.2		9.8
PSO	4.0		2.7		0.4
SWEPCo	7.7		6.8		6.0

Allowance For Borrowed Funds Used During Construction


	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
AEP	$	66.0	$	88.7	$	73.6
AEP Texas	12.5		20.0		18.4
AEPTCo	25.5		32.2		26.1
APCo	7.9		9.3		8.4
I&M	5.7		8.9		7.4
OPCo	6.2		6.7		5.8
PSO	2.0		1.9		0.9
SWEPCo	3.9		4.0		4.8

Jointly-owned Electric Facilities


				Registrant’s Share as of December 31, 2020
	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in millions)
AEP
Dolet Hills Power Station, Unit 1 (a)	Lignite	40.2	%	$	342.4	$	4.6	$	295.4
Flint Creek Generating Station, Unit 1 (b)	Coal	50.0	%	377.2		3.0		116.0
Pirkey Power Plant, Unit 1 (b)	Lignite	85.9	%	602.8		3.7		441.0
Oklaunion Power Station (f)(g)	Coal	70.3	%	—		—		—
Turk Generating Plant (b)	Coal	73.3	%	1,594.3		2.8		257.3
Total				$	2,916.7	$	14.1	$	1,109.7

AEP Texas
Oklaunion Power Station (f)(g)	Coal	54.7	%	$	—	$	—	$	—

I&M
Rockport Generating Plant (c)(d)(e)	Coal	50.0	%	$	1,228.5	$	19.6	$	677.3

PSO
Oklaunion Power Station (f)(g)	Coal	15.6	%	$	—	$	—	$	—

SWEPCo
Dolet Hills Power Station, Unit 1 (a)	Lignite	40.2	%	$	342.4	$	4.6	$	295.4
Flint Creek Generating Station, Unit 1 (b)	Coal	50.0	%	377.2		3.0		116.0
Pirkey Power Plant, Unit 1 (b)	Lignite	85.9	%	602.8		3.7		441.0
Turk Generating Plant (b)	Coal	73.3	%	1,594.3		2.8		257.3
Total				$	2,916.7	$	14.1	$	1,109.7


				Registrant’s Share as of December 31, 2019
	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in millions)
AEP
Dolet Hills Power Station, Unit 1 (a)	Lignite	40.2	%	$	337.3	$	6.2	$	216.5
Flint Creek Generating Station, Unit 1 (b)	Coal	50.0	%	374.3		3.4		101.1
Pirkey Power Plant, Unit 1 (b)	Lignite	85.9	%	607.8		7.7		416.8
Oklaunion Power Station (f)(g)	Coal	70.3	%	106.6		0.1		91.7
Turk Generating Plant (b)	Coal	73.3	%	1,593.3		1.7		225.8
Total				$	3,019.3	$	19.1	$	1,051.9

AEP Texas
Oklaunion Power Station (f)(g)	Coal	54.7	%	$	351.7	$	—	$	291.9

I&M
Rockport Generating Plant (c)(d)(e)	Coal	50.0	%	$	1,114.2	$	105.5	$	586.2

PSO
Oklaunion Power Station (f)(g)	Coal	15.6	%	$	106.6	$	0.1	$	91.7

SWEPCo
Dolet Hills Power Station, Unit 1 (a)	Lignite	40.2	%	$	337.3	$	6.2	$	216.5
Flint Creek Generating Station, Unit 1 (b)	Coal	50.0	%	374.3		3.4		101.1
Pirkey Power Plant, Unit 1 (b)	Lignite	85.9	%	607.8		7.7		416.8
Turk Generating Plant (b)	Coal	73.3	%	1,593.3		1.7		225.8
Total				$	2,912.7	$	19.0	$	960.2

(a)Operated by CLECO, a nonaffiliated company.

(b)Operated by SWEPCo.

(c)Operated by I&M.

(d)Amounts include I&M’s 50% ownership of both Unit 1 and capital additions for Unit 2. Unit 2 is subject to an operating lease with a nonaffiliated company. See the “Rockport Lease” section of Note 13 for additional information.

(e)AEGCo owns 50% of Unit 1 with I&M and 50% of capital additions for Unit 2.

(f)Operated by PSO, which owned 15.6%. Also was jointly-owned (54.7%) by AEP Texas and various nonaffiliated companies.

(g)Oklaunion Power Station was retired in September 2020 and sold to a nonaffiliated third-party in October 2020. See the “Dispositions” section of Note 7 for additional information.