2340 MW Nuclear operating in LaSalle, IL — PJM Interconnection, LLC
2,340 MW
Nameplate Capacity
2
Generators
units
Nuclear
Technology
1984
Operating Since
Coordinates
41.2455, -88.6691
County
LaSalle, IL
Nearby Plants
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
NERC Region
RFC
Balancing Authority
PJM Interconnection, LLC
Grid Voltage
345 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
1.6M MWh
Latest Month
18.9M MWh
Annual Generation
91.8%
Capacity Factor
No financial data available for this plant.
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
Last updated 2026-03-26
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