Property, Plant and Equipment |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 |
| |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2018 | | AEP | | AEP Texas | | AEPTCo | | APCo | | I&M | | OPCo | | PSO | | SWEPCo | | | | (in millions) | | Regulated Property, Plant and Equipment | | | | | | | | | | | | | | | | | | Generation | | $ | 20,989.1 |
| (a) | $ | — |
| | $ | — |
| | $ | 6,509.6 |
| | $ | 4,887.2 |
| | $ | — |
| | $ | 1,577.0 |
| | $ | 4,672.6 |
| (a) | Transmission | | 21,500.5 |
| | 3,683.6 |
| | 6,515.8 |
| | 3,317.7 |
| | 1,576.8 |
| | 2,544.3 |
| | 892.3 |
| | 1,866.9 |
| | Distribution | | 21,192.8 |
| | 4,043.2 |
| | — |
| | 3,989.4 |
| | 2,249.7 |
| | 4,942.3 |
| | 2,572.8 |
| | 2,178.6 |
| | Other | | 3,770.8 |
| | 724.6 |
| | 172.6 |
| | 457.4 |
| | 543.1 |
| | 563.7 |
| | 298.1 |
| | 485.2 |
| | CWIP | | 4,352.6 |
| (a) | 836.0 |
| | 1,578.3 |
| | 490.2 |
| | 465.3 |
| | 432.1 |
| | 94.0 |
| | 194.7 |
| (a) | Less: Accumulated Depreciation | | 17,743.1 |
| | 1,431.2 |
| | 271.9 |
| | 4,118.9 |
| | 3,139.4 |
| | 2,217.7 |
| | 1,472.1 |
| | 2,633.5 |
| | Total Regulated Property, Plant and Equipment - Net | | 54,062.7 |
| | 7,856.2 |
| | 7,994.8 |
| | 10,645.4 |
| | 6,582.7 |
| | 6,264.7 |
| | 3,962.1 |
| | 6,764.5 |
| | Nonregulated Property, Plant and Equipment - Net | | 1,036.4 |
| | 135.6 |
| | 1.4 |
| | 22.9 |
| | 28.5 |
| | 10.2 |
| | 4.6 |
| | 107.3 |
| | Total Property, Plant and Equipment - Net | | $ | 55,099.1 |
| | $ | 7,991.8 |
| | $ | 7,996.2 |
| | $ | 10,668.3 |
| | $ | 6,611.2 |
| | $ | 6,274.9 |
| | $ | 3,966.7 |
| | $ | 6,871.8 |
| |
| | (a) | AEP and SWEPCo’s regulated generation and regulated CWIP include amounts related to SWEPCo’s Arkansas jurisdictional share of the Turk Plant. |
|
Asset Retirement Obligation (ARO) |
| | | | | | | | | | | | | | | | | | | | | | | | | | 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 |
| | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | Company | | ARO as of December 31, 2017 | | Accretion Expense | | Liabilities Incurred | | Liabilities Settled | | Revisions in Cash Flow Estimates (a) | | ARO as of December 31, 2018 | | | (in millions) | AEP (b)(c)(d)(e) | | $ | 2,005.7 |
| | $ | 93.7 |
| | $ | 0.8 |
| | $ | (87.0 | ) | | $ | 342.3 |
| (f) | $ | 2,355.5 |
| AEP Texas (b)(e) | | 26.7 |
| | 1.2 |
| | — |
| | (0.1 | ) | | 0.1 |
| | 27.9 |
| APCo (b)(e) | | 125.0 |
| | 6.6 |
| | — |
| | (17.3 | ) | | 1.8 |
| | 116.1 |
| I&M (b)(c)(e) | | 1,321.8 |
| | 58.7 |
| | — |
| | (0.2 | ) | | 301.0 |
| (f) | 1,681.3 |
| OPCo (e) | | 1.7 |
| | 0.1 |
| | — |
| | — |
| | — |
| | 1.8 |
| PSO (b)(e) | | 54.0 |
| | 3.2 |
| | — |
| | (0.4 | ) | | (9.9 | ) | | 46.9 |
| SWEPCo (b)(d)(e) | | 169.2 |
| | 9.1 |
| | 0.2 |
| | (11.7 | ) | | 40.0 |
| | 206.8 |
|
| | (a) | 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 $1.73 billion and $1.66 billion as of December 31, 2019 and 2018, respectively. |
| | (d) | Includes ARO related to Sabine and DHLC. |
| | (e) | Includes ARO related to asbestos removal. |
| | (f) | Revision for Cook Plant related to a new third-party study, which impacted the ARO liability for changes of estimated cash flows and application of a new discount rate. |
|
Jointly-owned Electric Facilities |
| | | | | | | | | | | | | | | | | | | | | | | 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 | | | | | | | | | | Conesville Generating Station, Unit 4 (a)(h) | Coal | | 83.5 | % | | $ | — |
| | $ | — |
| | $ | — |
| Dolet Hills Power Station, Unit 1 (f) | Lignite | | 40.2 | % | | 337.3 |
| | 6.2 |
| | 216.5 |
| Flint Creek Generating Station, Unit 1 (g) | Coal | | 50.0 | % | | 374.3 |
| | 3.4 |
| | 101.1 |
| Pirkey Generating Station, Unit 1 (g) | Lignite | | 85.9 | % | | 607.8 |
| | 7.7 |
| | 416.8 |
| Oklaunion Power Station (e) | Coal | | 70.3 | % | | 106.6 |
| | 0.1 |
| | 91.7 |
| Turk Generating Plant (g) | Coal | | 73.3 | % | | 1,593.3 |
| | 1.7 |
| | 225.8 |
| Total | | | | | $ | 3,019.3 |
| | $ | 19.1 |
| | $ | 1,051.9 |
| | | | | | | | | | | AEP Texas | | | | | | | | | | Oklaunion Power Station (e) | Coal | | 54.7 | % | | $ | 351.7 |
| | $ | — |
| | $ | 291.9 |
| | | | | | | | | | | I&M | | | | | | | | | | Rockport Generating Plant (b)(c)(d) | Coal | | 50.0 | % | | $ | 1,114.2 |
| | $ | 105.5 |
| | $ | 586.2 |
| | | | | | | | | | | PSO | | | | | | | | | | Oklaunion Power Station (e) | Coal | | 15.6 | % | | $ | 106.6 |
| | $ | 0.1 |
| | $ | 91.7 |
| | | | | | | | | | | SWEPCo | | | | | | | | | | Dolet Hills Power Station, Unit 1 (f) | Lignite | | 40.2 | % | | $ | 337.3 |
| | $ | 6.2 |
| | $ | 216.5 |
| Flint Creek Generating Station, Unit 1 (g) | Coal | | 50.0 | % | | 374.3 |
| | 3.4 |
| | 101.1 |
| Pirkey Generating Station, Unit 1 (g) | Lignite | | 85.9 | % | | 607.8 |
| | 7.7 |
| | 416.8 |
| Turk Generating Plant (g) | Coal | | 73.3 | % | | 1,593.3 |
| | 1.7 |
| | 225.8 |
| Total | | | | | $ | 2,912.7 |
| | $ | 19.0 |
| | $ | 960.2 |
|
| | | | | | | | | | | | | | | | | | | | | | | Registrant’s Share as of December 31, 2018 | | Fuel Type | | Percent of Ownership | | Utility Plant in Service | | Construction Work in Progress | | Accumulated Depreciation | | | | | | (in millions) | AEP | | | | | | | | | | Conesville Generating Station, Unit 4 (a)(h) | Coal | | 83.5 | % | | $ | 16.4 |
| | $ | 0.2 |
| | $ | 2.4 |
| Dolet Hills Power Station, Unit 1 (f) | Lignite | | 40.2 | % | | 336.2 |
| | 5.1 |
| | 209.6 |
| Flint Creek Generating Station, Unit 1 (g) | Coal | | 50.0 | % | | 375.1 |
| | 1.6 |
| | 88.9 |
| Pirkey Generating Station, Unit 1 (g) | Lignite | | 85.9 | % | | 591.3 |
| | 16.6 |
| | 418.0 |
| Oklaunion Power Station (e) | Coal | | 70.3 | % | | 106.4 |
| | — |
| | 67.8 |
| Turk Generating Plant (g) | Coal | | 73.3 | % | | 1,590.5 |
| | 1.1 |
| | 197.5 |
| Total | | | | | $ | 3,015.9 |
| | $ | 24.6 |
| | $ | 984.2 |
| | | | | | | | | | | AEP Texas | | | | | | | | | | Oklaunion Power Station (e) | Coal | | 54.7 | % | | $ | 352.1 |
| | $ | 0.2 |
| | $ | 218.6 |
| | | | | | | | | | | I&M | | | | | | | | | | Rockport Generating Plant (b)(c)(d) | Coal | | 50.0 | % | | $ | 1,108.7 |
| | $ | 50.2 |
| | $ | 514.1 |
| | | | | | | | | | | PSO | | | | | | | | | | Oklaunion Power Station (e) | Coal | | 15.6 | % | | $ | 106.4 |
| | $ | — |
| | $ | 67.8 |
| | | | | | | | | | | SWEPCo | | | | | | | | | | Dolet Hills Power Station, Unit 1 (f) | Lignite | | 40.2 | % | | $ | 336.2 |
| | $ | 5.1 |
| | $ | 209.6 |
| Flint Creek Generating Station, Unit 1 (g) | Coal | | 50.0 | % | | 375.1 |
| | 1.6 |
| | 88.9 |
| Pirkey Generating Station, Unit 1 (g) | Lignite | | 85.9 | % | | 591.3 |
| | 16.6 |
| | 418.0 |
| Turk Generating Plant (g) | Coal | | 73.3 | % | | 1,590.5 |
| | 1.1 |
| | 197.5 |
| Total | | | | | $ | 2,893.1 |
| | $ | 24.4 |
| | $ | 914.0 |
|
| | (c) | 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. |
| | (d) | AEGCo owns 50% of Unit 1 with I&M and 50% of capital additions for Unit 2. |
| | (e) | Operated by PSO, which owns 15.6%. Also jointly-owned (54.7%) by AEP Texas and various nonaffiliated companies. |
| | (f) | Operated by CLECO, a nonaffiliated company. |
(h) Conesville Generating Station, Unit 4 was impaired as of December 31, 2019. See the “Impairments” section of Note 7.
|