Keystone is a coal-fired power facility with 1,872 MW of EIA-reported nameplate capacity in Armstrong County, Pennsylvania, registered as EIA Plant ID 3136. When constructed, Keystone Generating Station's two generating units were reported to be the largest generating units in the world. Reported commercial-operation dates are 1967 (Unit 1); 1968 (Unit 2).
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
Armstrong County · PJM
Keystone is currently operating; a closure or retirement is listed for 2032.
500 kV · Pennsylvania Electric Co. (Penelec)
Best-supported operating milestone.
Conventional Steam Coal
Keystone is currently operating; a closure or retirement is listed for 2032.
Keystone is currently operating; a closure or retirement is listed for 2032.
500 kV · Pennsylvania Electric Co. (Penelec)
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 936 MW 850 MW summer | Conventional Steam Coal Bituminous Coal · ST | Aug 1967 | Operating |
| 2 | 936 MW 850 MW summer | Conventional Steam Coal Bituminous Coal · ST | Jul 1968 | Operating |
| 3 | 2.5 MW 2.8 MW summer | Petroleum Liquids Disillate Fuel Oil · IC | Nov 1968 | Operating |
| 4 | 2.9 MW 2.8 MW summer | Petroleum Liquids Disillate Fuel Oil · IC | Nov 1968 | Operating |
| 5 | 2.9 MW | |||
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Keystone's first coal-fired generating unit entered commercial operation in 1967.
PJM
PJM · Armstrong County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Conemaugh | 1,951 MW | PA | |
| KeystoneCurrent | 1,872 MW | PA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioEIA-860 lists generator 1 with this operating date.
The second coal-fired generating unit entered commercial operation in 1968; sources also describe the plant as expanded in 1968.
Duquesne Light Holdings entered a purchase and sale agreement to acquire Atlantic City Electric's combined 108-MW interests in Keystone and Conemaugh, including a 2.47% Keystone interest.
GenOn completed its reorganization and transferred its interests in Keystone and Conemaugh, together with other consideration, to new owners.
Pennsylvania announced a proposed consent decree allowing Keystone and Conemaugh to continue operating through 2032, contingent on upgraded wastewater-treatment equipment and related bottom-ash-system compliance work.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Keystone has a reported capacity of 1,872 MW. Source: EIA Form 860.
Keystone is a Conventional Steam Coal facility in Armstrong County, PA, participating in the PJM market.
Keystone is in Armstrong County, PA, inside the PJM balancing area.
Keystone is operated by KeyCon Operating LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Keystone reports a commercial operation date of 1967. Current status: operating. Source: EIA Form 860.
Keystone reported 4,288.9 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
Keystone interconnects at Keystone Substation, on the Pennsylvania Electric Co. (Penelec) system.
By capacity, Keystone ranks #20 of 206 operating plants of the same technology nationally. It ranks #2 of 14 in PA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
