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

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

Generation and physical site

EIA plant 6026 · Inventory for Sep 2026.

Reported operating nameplate by technology

Nuclear: 2,340 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (2)

EIA generator status and nameplate capacity for LaSalle Generating Station
Generator	Technology	Status	Power (MW)	Energy (MWh)
1	Nuclear	Operating	1,170	Unknown
2	Nuclear	Operating	1,170	Unknown

Physical map location · OpenStreetMap: 41.24489, -88.66731
Filed location · EIA: 41.24550, -88.66907

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Sep 2026
EIA retrieved: Oct 24, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Aug 23, 2024
Map prepared: Oct 24, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

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

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

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

Mapped facility footprint

Mapped infrastructure geometry associated with this asset.© OpenStreetMap contributors · way/187599022

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

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

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
Apr 17, 1982
Unit 1 operating license issuedSafety Eval...
The NRC issued Unit 1 operating license NPF-11.
Oct 20, 1982
Oct 20, 1982
Unit 1 commercial operationSource
Unit 1 entered commercial service.
View 3 more milestonesHide 3 milestones
1. Dec 16, 1983
  Dec 16, 1983
  Unit 2 operating license issuedSafety Eval...
  The NRC issued Unit 2 operating license NPF-18.
2. Jan 1984
Oct 19, 1984
Oct 19, 1984
Unit 2 commercial operationSource
Unit 2 entered commercial service.
Aug 3, 2000
Aug 3, 2000
License-Transfer ApprovalFederal Reg...
The NRC approved Commonwealth Edison’s proposed transfer of the LaSalle operating licenses to Exelon Generation Company, LLC. The order stated that Exelon Generation would become the sole owner and operator after completion of the transfer; Commonwealth Edison was the predecessor owner and transferor.
Oct 19, 2016
Oct 19, 2016
Initial license renewal approvedLaSalle Cle...
The NRC approved renewed operating authorization allowing Unit 1 to operate through 2042 and Unit 2 through 2043.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

eia.gov2026 Generationregulatory

Common questions about LaSalle Generating Station

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is LaSalle Generating Station?

LaSalle Generating Station reports 2,340 MW nuclear of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.

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 18,503.1 GWh over the twelve months to 2026-07. 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.

Co-located assets

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.

Grand Ridge Wind Energy CenterOnshore Wind TurbineOnshore Wind Turbine210 MW2.4 km Grand Ridge Battery ProjectsBatteriesBatteries36 MW2.4 km Blackstone Wind Farm LLCOnshore Wind TurbineOnshore Wind Turbine106 MW11 km Grand Ridge Solar FarmSolar PhotovoltaicSolar Photovoltaic

Overview

Overview

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Infrastructure record

Profile

Structured profile

Generation and physical site

Reported operating nameplate by technology

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