The first mortgage indentures for the Ohio Companies, Penn, MP, PE and WP constitute direct first liens on substantially all of the respective physical property, subject only to excepted encumbrances, as defined in the first mortgage indentures. See Note 13, "Capitalization," of the Notes to Consolidated Financial Statements for information concerning financing encumbrances affecting certain of the Utilities’ properties.
FirstEnergy controls the following generation sources as of December 31, 2018, shown in the table below. Except for the OVEC participation referenced in the footnotes to the table, the competitive generating units are owned by AE Supply and the regulated generating units are owned by JCP&L and MP.
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| Plant (Location) | | Unit | | Total | | | Competitive | | | Regulated | |
| | | | Net Demonstrated Capacity (MW) | | | | | | | |
| Super-critical Coal-fired: | | | | | | | | | | | |
| Harrison (Haywood, WV) | | 1-3 | | 1,984 | | | — | | | 1,984 | |
| Pleasants (Willow Island, WV) | | 1-2 | | 1,300 | | (1) | 1,300 | | | — | |
| Fort Martin (Maidsville, WV) | | 1-2 | | 1,098 | | | — | | | 1,098 | |
| | | | 4,382 | | | 1,300 | | | 3,082 | |
| Sub-critical and Other Coal-fired: | | | | | | | | | | | |
| OVEC (Cheshire, OH) (Madison, IN) | | 1-11 | | 78 | | (2) | 67 | | | 11 | |
| | | | 78 | | | 67 | | | 11 | |
| Pumped-storage Hydro: | | | | | | | | | | | |
| Bath County (Warm Springs, VA) | | 1-6 | | 487 | | (3) | — | | | 487 | |
| Yard’s Creek (Blairstown Twp., NJ) | | 1-3 | | 210 | | (4) | — | | | 210 | |
| | | | 697 | | | — | | | 697 | |
| Total | | | | 5,157 | | | 1,367 | | | 3,790 | |
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| (1) | On August 26, 2018, FirstEnergy, the FES Key Creditor Groups, the FES Debtors and the UCC entered into a FES Bankruptcy settlement agreement which included the transfer of the Pleasants Power Station and related assets to FES or its designee for the benefit of FES' creditors. Prior to transfer and beginning no later than January 1, 2019, FES acquired the economic interests in Pleasants and AE Supply will operate Pleasants until the transfer. |
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| (2) | Represents AE Supply's 3.01% and MP's 0.49% entitlement based on their participation in OVEC. |
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| (3) | Represents AGC's 16.25% undivided interest in Bath County. The station is operated by VEPCO. |
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| (4) | Represents JCP&L’s 50% ownership interest. |
The above generating plants and load centers are connected by a transmission system with various voltage ratings ranging from 23 kV to 500 kV. FirstEnergy's overhead and underground transmission lines aggregate 24,506 circuit miles.
The Utilities’ electric distribution systems include 277,284 miles of overhead pole line and underground conduit carrying primary, secondary and street lighting circuits. They own substations with a total installed transformer capacity of approximately 164,611,989 kV-amperes.
All of FirstEnergy's transmission, distribution and generation assets operate in PJM.
FirstEnergy’s distribution and transmission systems as of December 31, 2018, consist of the following:
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| Distribution Lines(1) | | | Transmission Lines(1) | | | Substation Transformer Capacity(2) | |
| | | | | | | kV Amperes | |
| OE | 67,323 | | | 379 | | | 7,831,823 | |
| Penn | 13,628 | | | — | | | 1,064,907 | |
| CEI | 33,528 | | | — | | | 10,100,363 | |
| TE | 19,088 | | | 73 | | | 2,892,703 | |
| JCP&L | 23,666 | | | 2,598 | | | 23,616,166 | |
| ME | 19,000 | | | — | | | 5,190,675 | |
| PN | 27,698 | | | — | | | 9,044,989 | |
| ATSI(3) | — | | | 7,841 | | | 38,651,682 | |
| WP | 25,014 | | | 4,341 | | | 15,957,666 | |
| MP | 22,430 | | | 2,650 | | | 12,326,155 | |
| PE | 25,909 | | | 2,122 | | | 11,256,024 | |
| TrAIL | — | | | 262 | | | 12,689,600 | |
| MAIT | — | | | 4,240 | | | 13,989,236 | |
| Total | 277,284 | | | 24,506 | | | 164,611,989 | |
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| (2) | Top rating of in-service power transformers only. Excludes grounding banks, station power transformers, and generator and customer-owned transformers. |
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| (3) | Represents transmission line assets of 69 kV and greater located in the service territories of OE, Penn, CEI and TE. |