Eddystone Generating Station
Constellation Energy CorporationDelaware County
Eddystone Generating Station is a six-unit, 820 MW dual-fuel power plant on the Delaware River in Eddystone, Pennsylvania. Units 3 and 4 are subcritical steam boiler-turbine generator units, each rated at 380 MW, capable of burning natural gas or oil. Units 10, 20, 30, and 40 are oil-fired peaking units with a combined capacity of 60 MW. The facility's earlier coal-fired Units 1 and 2 came online in 1960 and have been retired.
Mapped infrastructure geometry associated with this asset.
EIA plant 3161 · Inventory for Aug 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 10 | Petroleum Liquids | Operating | 18.6 | Unknown |
| 20 | Petroleum Liquids | Operating | 18.6 | Unknown |
| 3 | Natural Gas Steam Turbine | Operating | 391 | Unknown |
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 353.6 MW 279 MW summer | Conventional Steam Coal Bituminous Coal · ST | Feb 1960 Retirement: May 2011 | Operating |
| 10 | 18.6 MW 13 MW summer | Petroleum Liquids Disillate Fuel Oil · GT | May 1967 | Operating |
| 2 | 353.6 MW 309 MW summer | Conventional Steam Coal Bituminous Coal · ST | Oct 1960 Retirement: May 2012 | Operating |
| 20 | 18.6 MW 13 MW summer | Petroleum Liquids Disillate Fuel Oil · GT | Oct 1967 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
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Project milestones and public references behind the asset profile.
Eddystone Unit 1 began as a cooperative engineering effort involving Combustion Engineering, Westinghouse Electric, and Philadelphia Electric Company. Design phase occurred 1956-57.
| 30 | Petroleum Liquids | Operating | 21.2 | Unknown |
|---|
| 4 | Natural Gas Steam Turbine | Operating | 391 | Unknown |
|---|
| 40 | Petroleum Liquids | Operating | 21.2 | Unknown |
|---|
| 2 | Conventional Steam Coal | Retired | 353.6 | Unknown |
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| 1 | Conventional Steam Coal | Retired | 353.6 | Unknown |
|---|
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 | |
|---|---|---|---|
| Handley | 1,314.8 MW | TX | |
| Wolf Hollow II | 1,231.2 MW | TX | |
| Colorado Bend II | 1,230.3 MW | TX | |
| Muddy Run | 1,072 MW | PA | |
| Eddystone Generating StationCurrent | 861.6 MW | PA | |
| Croydon CT Generating Station | 546.4 MW | PA | |
| Conowingo | 530.8 MW | MD | |
| Exelon West Medway II LLC | 263.6 MW | MA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioThe first two Eddystone units came online in 1960 as supercritical, coal-fired steam units.
EIA-860 lists generator 1 with this operating date.
EIA-860 lists generator 2 with this operating date.
Units 10, 20, 30, and 40 were installed during 1967-1970 and provide a combined 60 MW of oil-fired peaking capacity.
Units 3 and 4, two 380 MW subcritical steam boiler-turbine units, were installed between 1967 and 1970.
EIA-860 lists generator 10 with this operating date.
EIA-860 lists generator 20 with this operating date.
EIA-860 lists generator 30 with this operating date.
EIA-860 lists generator 40 with this operating date.
EIA-860 lists generator 3 with this operating date.
EIA-860 lists generator 4 with this operating date.
Exelon Corporation was formed from the 2000 merger of PECO Energy Co. and Unicom Corporation. Eddystone Generating Station came under Exelon's ownership through that merger.
EIA-860 lists a planned retirement for generator 1.
EIA-860 lists a planned retirement for generator 2.
Exelon Generation Company, LLC became a wholly owned subsidiary of Constellation Energy Corporation, was renamed Constellation Energy Generation, LLC, and continued to own and operate Eddystone and other generation facilities.
The Department of Energy issued Order 202-25-04 requiring Units 3 and 4 to remain available for operation for 90 days, through August 28, 2025, due to PJM resource-adequacy concerns.
Successive DOE orders extended required operation through November 26, 2025, and then February 24, 2026.
FERC granted a limited waiver allowing removal of the Eddystone Units from Capacity Resource status and transfer of their 760 MW of Capacity Interconnection Rights to the Crane Clean Energy Center.
The Department of Energy issued an emergency order on August 21, 2026, directing PJM Interconnection and Constellation Energy to keep Eddystone Units 3 and 4 available through November 20, 2026.
EIA-860 lists a planned retirement for generator 3, generator 4.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Eddystone Generating Station reports 79.6 MW petroleum + 782 MW natural gas of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Eddystone Generating Station is a Petroleum Liquids, Natural Gas Steam Turbine facility in Delaware County, PA, participating in the PJM market.
Eddystone Generating Station is in Delaware County, PA, inside the PJM balancing area.
Eddystone Generating Station is operated by Constellation Power, Inc according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Eddystone Generating Station reported 60.8 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.
By capacity, Eddystone Generating Station ranks #40 of 259 operating plants of the same technology nationally. It ranks #4 of 12 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.