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2340 MW Nuclear operating in LaSalle, IL
2,340 MW
Nameplate Capacity
2
Generators
units
Nuclear
Technology
1984
Operating Since
Coordinates
41.2455, -88.6691
County
LaSalle, IL
Nearby Plants
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Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Constellation Nuclear | Exelon Generation | Exelon |
| Owner(s) | Constellation Nuclear | Exelon | — |
| Status | Operating | operating | — |
LaSalle County Nuclear Generating Station, located in Brookfield Township, LaSalle County, Illinois, near Marseilles, 11 miles (18 km) southeast of Ottawa, serves Chicago and Northern Illinois with electricity. The plant is owned and operated by Constellation Energy following separation from Exelon Corporation in 2022. Its Units 1 and 2 began commercial operation in October 1982, and October 1984, respectively.
Read more on WikipediaLaSalle Generating Station is a 2,340 MW nuclear power plant located in LaSalle County, Illinois. The plant, which began operating in 1984, is owned by Exelon and operated by Constellation Nuclear. It consists of two nuclear reactors and is the third-largest power plant in Illinois and the 16th-largest nuclear plant in the United States, out of 55 total.
LaSalle Generating Station operates within the PJM Interconnection, LLC balancing authority and the ReliabilityFirst Corporation (RFC) NERC region. The plant's latest annual generation was 18,873,952 MWh, achieving a capacity factor of 91.8%.
Generated from EIA, GEM, and public data sources
ISO/RTO
PJM
Market
ISO/RTO Member
NERC Region
RFC
Balancing Authority
PJM Interconnection, LLC (PJM)
Grid Voltage
345.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
1.6M MWh
Latest Month
18.9M MWh
Annual Generation
91.8%
Capacity Factor
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Point of Interconnection
Nearest Substation
LaSalle Substation · 345 kV
Substation Distance
< 10 km
Operator
Commonwealth Edison
Coord Source
OSM spatial
Market Position
ISO/RTO Market
PJM
LMP Node
86191101
Pricing Hub
N ILLINOIS HUB
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-04-09
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Nuclear emergency sirens accidentally activated in LaSalle County; confirmed by officials as an error, no actual plant emergency.
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