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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment
December 31, 2021AEPAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
(in millions)
Regulated Property, Plant and Equipment
Generation
$21,196.8 (a)$— $— $6,683.9 $5,531.8 $— $1,802.4 $4,734.5 (a)
Transmission29,866.0 5,849.9 10,886.3 4,322.4 1,783.1 2,992.8 1,107.7 2,316.9 
Distribution24,440.0 4,917.2 — 4,683.3 2,800.1 6,070.6 3,004.9 2,514.3 
Other5,249.8 958.7 427.2 668.9 755.1 982.2 433.5 542.0 
CWIP3,632.4 (a)551.3 1,394.8 469.9 302.8 365.0 156.0 240.7 (a)
Less: Accumulated Depreciation
20,375.5 1,642.9 772.9 5,047.4 3,885.3 2,457.4 1,707.0 3,002.2 
Total Regulated Property, Plant and Equipment - Net
64,009.5 10,634.2 11,935.4 11,781.0 7,287.6 7,953.2 4,797.5 7,346.2 
Nonregulated Property, Plant and Equipment - Net
1,991.8 1.2 0.3 23.3 23.3 9.8 5.3 53.9 
Total Property, Plant and Equipment - Net
$66,001.3 (b)$10,635.4 $11,935.7 (b)$11,804.3 $7,310.9 $7,963.0 $4,802.8 $7,400.1 
December 31, 2020AEPAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
(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)
Transmission27,841.5 5,279.6 9,593.5 3,900.5 1,696.4 2,831.9 1,069.9 2,165.7 
Distribution23,972.1 4,580.8 — 4,464.3 2,594.6 5,708.3 2,853.0 2,382.5 
Other4,852.4 866.0 328.8 598.0 644.6 888.5 388.1 564.5 
CWIP3,815.0 (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 

(a)AEP and SWEPCo’s regulated generation and regulated CWIP include amounts related to SWEPCo’s Arkansas jurisdictional share of the Turk Plant.
(b)Amount excludes $2.3 billion and $165 million for AEP and AEPTCo, respectively, of Property, Plant and Equipment - Net classified as Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.
Depreciation, Depletion and Amortization - Regulated
AEP
202120202019
Functional Class of PropertyAnnual 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)
Generation2.7%-7.8%20-1322.7%-6.3%20-1322.5%-5.5%20-132
Transmission2.0%-2.6%15-752.0%-2.6%15-751.8%-2.6%15-81
Distribution2.8%-3.6%7-802.7%-3.7%7-782.7%-3.7%7-78
Other3.0%-12.5%5-752.8%-11.3%5-752.6%-9.5%5-75
AEP Texas
202120202019
Functional Class of PropertyAnnual 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)
Transmission2.2%50-752.0%50-751.8%45-81
Distribution2.9%7-703.1%7-703.5%7-70
Other5.8%5-506.1%5-506.3%5-50
AEPTCo
202120202019
Functional Class of PropertyAnnual 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)
Transmission2.5%24-752.4%24-752.0%24-75
Other6.7%5-566.3%5-645.8%5-64
APCo
202120202019
Functional Class of PropertyAnnual 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)
Generation3.6%35-1183.3%35-1183.2%35-118
Transmission2.1%15-752.2%15-751.8%15-71
Distribution3.5%12-573.7%12-573.7%12-57
Other8.5%5-557.8%5-557.2%5-55
I&M
202120202019
Functional Class of PropertyAnnual 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)
Generation4.7%20-1324.6%20-1324.0%20-132
Transmission2.4%45-702.3%45-701.9%50-73
Distribution3.4%14-713.4%14-713.4%9-75
Other9.0%5-5110.2%5-519.4%5-50
OPCo
202120202019
Functional Class of PropertyAnnual 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)
Transmission2.3%39-602.3%39-602.3%39-60
Distribution2.9%11-703.1%14-653.1%14-65
Other6.1%5-505.0%5-504.9%5-50
PSO
202120202019
Functional Class of PropertyAnnual 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)
Generation2.8%30-753.1%35-752.9%35-75
Transmission2.4%42-752.2%45-752.4%45-75
Distribution2.9%15-782.9%15-782.9%15-78
Other6.1%5-565.7%5-645.6%5-64
SWEPCo
202120202019
Functional Class of PropertyAnnual 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)
Generation2.7%30-652.7%35-652.5%40-70
Transmission2.4%49-742.3%47-732.4%50-73
Distribution2.8%15-802.7%15-672.7%25-70
Other8.6%5-588.5%5-527.6%5-55
Depreciation, Depletion and Amortization - Unregulated
202120202019
Functional Class of PropertyAnnual 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)
Generation3.8%-10.4%10-593.6%-4.0%15-593.2%-21.2%15-59
Transmission2.6%30-402.5%30-402.5%30-40
DistributionNANANANA2.3%40
Other16.5%5-35(a)16.1%5-5017.6%5-50

(a)In 2020 management announced plans to retire the Pirkey Plant in 2023 and the related depreciable lives have been adjusted accordingly. See Note 5 - Effects of Regulation for additional information.
NA Not applicable.
Asset Retirement Obligation (ARO)
CompanyARO as of December 31, 2020Accretion
Expense
Liabilities
Incurred
Liabilities
Settled
Revisions in
Cash Flow
Estimates (a)
ARO as of December 31, 2021
(in millions)
AEP (b)(c)(d)(e)(f)$2,516.7 $105.0 $22.8 $(41.4)$138.6 $2,741.7 
AEP Texas (b)(e)4.6 0.2 — (0.4)— 4.4 
APCo (b)(e)313.1 13.7 — (6.9)84.7 404.6 
I&M (b)(c)(e)1,813.8 72.9 0.3 (0.1)59.4 1,946.3 
OPCo (e)1.9 0.1 — (0.1)— 1.9 
PSO (b)(e)47.4 3.3 7.6 (0.7)— 57.6 
SWEPCo (b)(d)(e)222.1 9.8 9.2 (20.9)2.5 222.7 
CompanyARO as of December 31, 2019Accretion
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 

(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 $1.93 billion and $1.80 billion as of December 31, 2021 and 2020, respectively.
(d)Includes ARO related to Sabine and DHLC.
(e)Includes ARO related to asbestos removal.
(f)Includes $18 million of ARO classified as Liabilities Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.
Allowance For Equity Funds Used During Construction
Years Ended December 31,
Company202120202019
(in millions)
AEP$139.7 $148.1 $168.4 
AEP Texas21.5 19.4 15.2 
AEPTCo67.2 74.0 84.3 
APCo15.6 14.6 16.6 
I&M12.8 11.5 19.4 
OPCo10.8 12.5 18.2 
PSO2.4 4.0 2.7 
SWEPCo7.0 7.7 6.8 
Allowance For Borrowed Funds Used During Construction
Years Ended December 31,
Company202120202019
(in millions)
AEP$53.8 $66.0 $88.7 
AEP Texas10.5 12.5 20.0 
AEPTCo21.0 25.5 32.2 
APCo7.5 7.9 9.3 
I&M5.1 5.7 8.9 
OPCo4.7 6.2 6.7 
PSO0.7 2.0 1.9 
SWEPCo3.0 3.9 4.0 
Jointly-owned Electric Facilities
Registrant’s Share as of December 31, 2021
Fuel
Type
Percent of
Ownership
Utility Plant
in Service
Construction
Work in
Progress
Accumulated
Depreciation
(in millions)
AEP
Dolet Hills Power Station, Unit 1 (a)Lignite40.2 %$— $— $— 
Flint Creek Generating Station, Unit 1 (b)Coal50.0 %377.6 6.3 133.5 
Pirkey Power Plant, Unit 1 (b)Lignite85.9 %613.8 — 528.3 
Turk Generating Plant (b)Coal73.3 %1,598.0 10.2 285.6 
Total
$2,589.4 $16.5 $947.4 
I&M
Rockport Generating Plant (c)(d)(e)Coal50.0 %$1,247.2 $13.9 $794.5 
PSO
North Central Wind Energy Facilities (f)(g)Wind45.5 %$313.7 $— $4.2 
SWEPCo
Dolet Hills Power Station, Unit 1 (a)Lignite40.2 %$— $— $— 
Flint Creek Generating Station, Unit 1 (b)Coal50.0 %377.6 6.3 133.5 
Pirkey Power Plant, Unit 1 (b)Lignite85.9 %613.8 — 528.3 
Turk Generating Plant (b)Coal73.3 %1,598.0 10.2 285.6 
North Central Wind Energy Facilities (f)(g)Wind54.5 %376.2 — 5.4 
Total$2,965.6 $16.5 $952.8 
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)Lignite40.2 %$342.4 $4.6 $295.4 
Flint Creek Generating Station, Unit 1 (b)Coal50.0 %377.2 3.0 116.0 
Pirkey Power Plant, Unit 1 (b)Lignite85.9 %602.8 3.7 441.0 
Turk Generating Plant (b)Coal73.3 %1,594.3 2.8 257.3 
Total
$2,916.7 $14.1 $1,109.7 
I&M
Rockport Generating Plant (c)(d)(e)Coal50.0 %$1,228.5 $19.6 $677.3 
SWEPCo
Dolet Hills Power Station, Unit 1 (a)Lignite40.2 %$342.4 $4.6 $295.4 
Flint Creek Generating Station, Unit 1 (b)Coal50.0 %377.2 3.0 116.0 
Pirkey Power Plant, Unit 1 (b)Lignite85.9 %602.8 3.7 441.0 
Turk Generating Plant (b)Coal73.3 %1,594.3 2.8 257.3 
Total
$2,916.7 $14.1 $1,109.7 

(a)Operated by CLECO, a nonaffiliated company. The Dolet Hills Power Station was retired in December 2021.
(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 a finance 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)PSO and SWEPCo own undivided interests of 45.5% and 54.5% of the NCWF, respectively. Sundance was placed into service in April 2021. Maverick was placed into service in September 2021. See the “Acquisitions” section of Note 7 for additional information.
(g)Operated by PSO.