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).
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
Constellation Nuclear · Montgomery County · PJM
Limerick is operating.
Nuclear
Limerick is operating.
PJM
PJM · Montgomery County
Similar plants ranked by technology, capacity, and distance.
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 |
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.
EIA-860 lists generator 1 with this operating date.
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 | |
|---|---|---|---|
| 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 | 2,018.6 MW | IL | |
| Dresden Generating Station | 2,018.6 MW | IL | |
| Nine Mile Point Nuclear Station | 1,901.1 MW | NY |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioLimerick Unit 1 began commercial operation.
EIA-860 lists generator 2 with this operating date.
The NRC approved renewed operating authority for Unit 1 through 2044 and Unit 2 through 2049.
Exelon completed the separation of Constellation Energy, its former generation and competitive-energy business. Constellation Energy Generation, LLC subsequently appears as the NRC licensee for Limerick.
The NRC approved Constellation's $167 million Digital Modernization Project, replacing selected analog instrumentation and control equipment with digital systems; installation is planned in phases during refueling outages.
Constellation reported a $90 million Limerick refueling and maintenance outage involving cooling-tower performance upgrades, generator-component replacements, and related work.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Limerick has a reported capacity of 2,277 MW. Source: EIA Form 860.
Limerick is a nuclear facility in Montgomery County, PA, participating in the PJM market.
Limerick is in Montgomery County, PA, inside the PJM balancing area.
Limerick is operated by Constellation Nuclear according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Limerick reported 19,355.1 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
Limerick on the PECO Energy Co. system.
By capacity, Limerick ranks #19 of 54 operating plants of the same technology nationally. It ranks #3 of 4 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.
