How big is LaSalle Generating Station?

LaSalle Generating Station has a reported capacity of 2,340 MW. Source: EIA Form 860.

What kind of plant is LaSalle Generating Station?

LaSalle Generating Station is a nuclear facility in LaSalle County, IL, participating in the PJM market.

Where is LaSalle Generating Station located?

LaSalle Generating Station is in LaSalle County, IL, inside the PJM balancing area.

Who operates LaSalle Generating Station?

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

How much electricity does LaSalle Generating Station generate?

LaSalle Generating Station reported 18,495 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.

How does LaSalle Generating Station compare to other plants?

By capacity, LaSalle Generating Station ranks #15 of 54 operating plants of the same technology nationally. It ranks #3 of 6 in IL.

LaSalle Generating Station — 2,340 MW nuclear plant, IL

Ask the Grid/

Create free workspace

Ask the Grid

Create free workspace

LaSalle Generating Station — 2,340 MW nuclear plant, IL · Ask the Grid

Overview

Reported capacity: 2,340 MW
EIA-reported operating capacity; nameplate, seasonal, AC/DC, and unit ratings may differ.
Technology: Nuclear
Primary generation technology.
Registry anchor: Plant 6026
Constellation Nuclear · LaSalle County · PJM
Operating status: Operating
LaSalle Generating Station is operating.
Commercial operation: October 20, 1982
Best-supported operating milestone.

Profile

Grid role: Reliable clean baseload generation
Physical build: Two operating General Electric boiling-water reactor units (LaSalle County Units 1 and 2); GE supplied the nuclear steam supply systems, while Sargent & Lundy designed and constructed the balance of plant. The site also includes a 2,058-acre cooling lake and five onsite standby diesel generators serving the two units.

Structured profile

Reported capacity: 2,340 MW
Nuclear
Commercial operation: October 20, 1982
Operating status: operating
LaSalle Generating Station is operating.
Location: LaSalle County
PJM
Operator: Constellation Nuclear

Related assets

Similar plants ranked by technology, capacity, and distance.

Braidwood Generation Station

Nuclear · 2,449.8 MW

Will County

Same typeComparable scale23 mi away

Compare with this plant

Dresden Generating Station

Nuclear · 2,018.6 MW

Grundy County

Same typeComparable scale23 mi away

Compare with this plant

Units and generators

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

Generator	Capacity	Technology	Operation	Status
1	1,170 MW 1,130.5 MW summer	Nuclear Nuclear · ST	Jan 1984	Operating
2	1,170 MW 1,133.9 MW summer	Nuclear Nuclear · ST	Oct 1984	Operating

Performance

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

Peer context

Technology capacity: 2,340 MW; Nuclear
National rank: #15; of 54 operating peers
IL rank: #3; of 6 operating peers

Monthly generation

Download CSV

Latest 12 months

18.49 TWh

Reported net generation

Latest report

Jun 2026

EIA-923 monthly filing

2025 capacity factor

92.1%

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

LA SALLE

IN SERVICE · 345 kV

0.3 km

UNKNOWN122022

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

Developed Site Area

2015

Generating facilities and associated infrastructure

The corrected environmental-report land-use figures identify approximately 160 acres occupied by generating facilities and associated infrastructure, including roads, parking, warehouses, and the switchyard.

Source

Environmental Incident And Corrective Action

Jul 13, 2012

Cooling-pond blowdown-line failure and repair

A July 2012 blowdown-line rupture released an indeterminate amount of cooling-pond water before isolation. Sampling showed pH 7.87 and total residual chlorine 0.09 ppm within permit limits; the line was replaced, returned to service July 20, 2012, and the report concluded there was no significant environmental effect.

LaSalle, Units 1 and 2, Response to NRC Request for Additional Information, dated May 22, 2015 Regarding License Renewal Application, Environmental Review, SW-09 on Water Resources, with Attachments.

Permitted Discharge

2013

NPDES discharge configuration and flow

The permit identifies primary Outfall 001 as cooling-pond blowdown to the Illinois River and Outfall 002 as Illinois River makeup-water intake-screen backwash. Internal discharge points include demineralizer regenerant, sewage-treatment effluent, wastewater-treatment effluent, cooling-water screen backwash, radwaste-treatment effluent, auxiliary cooling/flushing water, stormwater, and reverse-osmosis reject/filter backwash. Average cooling-pond blowdown from Outfall 001 is approximately 34.98 MGD.

Index

Site Area

2015

Corrected NRC/owner property area

The NRC environmental-report update corrected the LSCS property-ownership boundary area from 3,875 acres to 3,776 acres (1,528 hectares). This is the corrected regulatory/owner property-area statement.

Source

Site Identity And Parcel Record

LaSalle Generating Station site identity and parcels

The exact EIA plant is LaSalle Generating Station in Marseilles, LaSalle County, Illinois, at 2601 North 21st Road. The Illinois State Fire Marshal record identifies parcels 29-17-403-000 and 29-17-202-000 and lists Constellation Energy Generation, LLC as current owner.

Office of the Illinois State Fire Marshal UST Search: Facility Details for LaSalle County Nuclear Station

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 / operatorFinancier

Parties and identifiers

OrganizationRoleBasis

plant:plant-6026

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Sep 7, 1973
Sep 7, 1973
Construction Permits IssuedSafety Eval...
The NRC issued construction permits CPPR-99 for Unit 1 and CPPR-100 for Unit 2.
Apr 17, 1982

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 StationCurrent	2,340 MW	IL
Limerick	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 portfolio

LaSalle Generating Station