How big is Eddystone Generating Station?

Eddystone Generating Station has a reported capacity of 861.6 MW. Source: EIA Form 860M.

What kind of plant is Eddystone Generating Station?

Eddystone Generating Station is a Petroleum Liquids, Natural Gas Steam Turbine facility in Delaware County, PA, participating in the PJM market.

Where is Eddystone Generating Station located?

Eddystone Generating Station is in Delaware County, PA, inside the PJM balancing area.

Who operates Eddystone Generating Station?

Eddystone Generating Station is operated by Constellation Power, Inc according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Eddystone Generating Station generate?

Eddystone Generating Station reported 60.8 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.

How does Eddystone Generating Station compare to other plants?

By capacity, Eddystone Generating Station ranks #40 of 257 operating plants of the same technology nationally. It ranks #4 of 12 in PA.

Eddystone Generating Station — 862 MW gas plant, PA

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Eddystone Generating Station — 862 MW gas plant, PA · Ask the Grid

Overview

Nameplate capacity: 861.6 MW
Canonical EIA plant baseline.
Registry anchor: Plant 3161
plant-3161

Structured profile

Technology: Petroleum Liquids, Natural Gas Steam Turbine
Operator: Constellation Power, Inc.

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Units and generators

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

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 782 MW
National rank: #40
PA rank: #4

Monthly generation

Download CSV

Latest 12 months

60.8 GWh

Reported net generation

Latest report

Dec 2024

EIA-923 monthly filing

2024 capacity factor

0.8%

Using current reported nameplate capacity

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Nearby substations

HIFLD infrastructure inventory

EDDYSTONE

IN SERVICE · 230 kV

0.4 km

TAP141122

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Transactions and agreements

Regulatory Approval

Jun 1, 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.

Federal Energy Regulatory Commission · Constellation Energy Corporation · PJM Interconnection, L.L.C.

rtoinsider.com

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

Drag organizations to explore the network. Select a node to pin its details and available page link.

AssetOwner / operatorContractorEquipment

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

1954
1954
Unit 1 engineering and construction initiatedasme.org
Eddystone Unit 1 began as a cooperative engineering effort involving Combustion Engineering, Westinghouse Electric, and Philadelphia Electric Company. Design phase occurred 1956-57.
1960
1960
Units 1 and 2 entered service

Reporting portfolio

EIA reporting entity

Constellation Power, Inc

Entity 6035

Operating portfolio

17 plants

4 states

Reported capacity

7,734.1 MW

Conventional Hydroelectric · Hydroelectric Pumped Storage · Natural Gas Fired Combined Cycle

Largest reported plants in this portfolio
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 portfolio

View 15 more milestones

Oct 1960
Oct 1960
Generator enters operationEIA-860
EIA-860 lists generator 2 with this operating date.
1967
1967
Oil-fired peaking units installedconstellati...
Units 10, 20, 30, and 40 were installed during 1967-1970 and provide a combined 60 MW of oil-fired peaking capacity.
1967
1967
Units 3 and 4 installedconstellati...
Units 3 and 4, two 380 MW subcritical steam boiler-turbine units, were installed between 1967 and 1970.
May 1967
May 1967
Generator enters operationEIA-860
EIA-860 lists generator 10 with this operating date.
Oct 1967
Oct 1967
Generator enters operationEIA-860
EIA-860 lists generator 20 with this operating date.
Mar 1970
Mar 1970
Generator enters operationEIA-860
EIA-860 lists generator 30 with this operating date.
Jun 1970
Jun 1970
Generator enters operationEIA-860
EIA-860 lists generator 40 with this operating date.
Sep 1974
Sep 1974
Generator enters operationEIA-860
EIA-860 lists generator 3 with this operating date.
Jun 1976
Jun 1976
Generator enters operationEIA-860
EIA-860 lists generator 4 with this operating date.
2000
2000
Exelon formed; PECO ownership changescompany-his...
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.
May 2011
May 2011
Planned generator retirementEIA-860
EIA-860 lists a planned retirement for generator 1.
May 2012
May 2012
Planned generator retirementEIA-860
EIA-860 lists a planned retirement for generator 2.
Feb 1, 2022
Feb 1, 2022
Exelon generation business separated into Constellationepa.gov
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.
May 30, 2025
May 30, 2025
DOE emergency order issued (first extension)energy.gov
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.
Aug 21, 2025
Aug 21, 2025
DOE emergency order extended (successive extensions)energy.gov
Successive DOE orders extended required operation through November 26, 2025, and then February 24, 2026.

Eddystone Generating Station