Limerick has a reported capacity of 2,277 MW. Source: EIA Form 860.

What kind of plant is Limerick?

Limerick is a nuclear facility in Montgomery County, PA, participating in the PJM market.

Where is Limerick located?

Limerick is in Montgomery County, PA, inside the PJM balancing area.

Who operates Limerick?

Limerick is operated by Constellation Nuclear according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Limerick generate?

Limerick reported 19,434 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

Where does Limerick connect to the grid?

Limerick on the PECO Energy Co. system.

How does Limerick compare to other plants?

By capacity, Limerick ranks #19 of 54 operating plants of the same technology nationally. It ranks #3 of 4 in PA.

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NuclearPJM · Montgomery County

Limerick

PECO Energy Company · Montgomery County · PJM

Limerick is a nuclear power facility with 2,277 MW of EIA-reported nameplate capacity in Montgomery County, Pennsylvania, registered as EIA Plant ID 6105. Constellation Nuclear owns and operates the plant. The plant's generating configuration is two operating General Electric boiling-water nuclear reactors. Reported commercial-operation dates are February 1, 1986 (Unit 1); January 8, 1990 (Unit 2).

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Overview

Key fields

Reported capacity: 2,277 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Nuclear
Primary generation technology.
Registry anchor: Plant 6105
Constellation Nuclear · Montgomery County · PJM
Operating status: Operating

Asset analyst

plant:plant-6105

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Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
1	1,138.5 MW 1,119.7 MW summer	Nuclear Nuclear · ST	Feb 1986	Operating
2	1,138.5 MW 1,122.1 MW summer	Nuclear Nuclear · ST	Jan 1990	Operating

Commercial, land, and environmental record

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

Land and environmental record

Cooling And Water Source

Jul 23, 2020

Closed-cycle cooling using cooling towers with makeup water withdrawn from Schuylkill River and/or Perkiomen Creek

Cooling water for the steam-turbine condensers is furnished from cooling towers; makeup water is withdrawn from the Schuylkill River and/or Perkiomen Creek per approved water-supply system.

Source

Environmental Compliance Milestone

Dec 22, 2025

2025 NRC inspection found no findings or violations above minor significance

The NRC's integrated inspection of Limerick Units 1 and 2, completed September 30, 2025, reported no findings or violations of more than minor significance. The inspection reviewed radiological environmental monitoring and the Groundwater Protection Initiative.

Limerick Generating Station, Units 1 and 2 - Integrated Inspection Report 05000352/2025003 and 05000353/2025003

NRC Regulatory Site Area

645-acre NRC plant site comprising 491 acres in Montgomery County and 154 acres in Chester County

An NRC environmental-review record identifies the total plant site as 645 acres: 491 acres in Montgomery County and 154 acres in Chester County. This is the regulatory site area used by NRC for license renewal environmental assessment.

Request for List of Federal Protected Species Within the Area Under Evaluation for the Limerick Generating Station, Units 1 and 2, License Renewal Application Review.

Owner Reported Site Area

600-acre site

The current owner location page (Constellation Energy) reports that Limerick sits on a 600-acre site adjoining the Schuylkill River. This is owner-reported total site acreage.

Limerick Clean Energy Center | Constellation Energy Locations

Permit Site Area

Jul 23, 2020

491-acre operating site

The Pennsylvania NPDES fact sheet describes Limerick Generating Station as being located on a 491-acre site adjoining the east bank of the Schuylkill River, mostly in Limerick Township. This is the permit-based operating site acreage for the primary facility.

Source

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.

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AssetOwner / operatorContractorEquipment

Parties and identifiers

OrganizationRoleBasis

plant:plant-6105Grid selectionCanonical asset page /assets/facilities/limerick.

Reporting portfolio

EIA reporting entity

Constellation Nuclear

Entity 55951

Operating portfolio

12 plants

4 states

Reported capacity

22,817.3 MW

Nuclear

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Peach Bottom	2,876.4 MW	PA
Braidwood Generation Station	2,449.8 MW	IL
Byron Generating Station	2,449.8 MW	IL
LaSalle Generating Station	2,340 MW	IL
LimerickCurrent	2,277 MW	PA
Quad Cities Generating Station

Overview

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Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

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Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

Sources

Common questions about Limerick

How big is Limerick?

What kind of plant is Limerick?

Where is Limerick located?

Who operates Limerick?

How much electricity does Limerick generate?

Where does Limerick connect to the grid?

How does Limerick compare to other plants?

Co-located assets

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