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1138.3 MW Nuclear operating in DeWitt, IL
1,138.3 MW
Nameplate Capacity
1
Generators
unit
Nuclear
Technology
1987
Operating Since
Coordinates
40.1719, -88.8339
County
DeWitt, 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 | Constellation Energy |
| Owner(s) | Constellation Nuclear | Exelon | — |
| Status | Operating | operating | — |
The Clinton Power Station is a nuclear power plant located near Clinton, Illinois, USA. The power station began commercial operation on November 24, 1987 and has a nominal net electric output of 1062 MWe. Due to inflation and cost overruns, Clinton's final construction cost was $4.25 billion, nearly 1,000% over the original budget of $430 million and seven years behind schedule.
Read more on WikipediaClinton Power Station is a nuclear power plant located in DeWitt County, Illinois. The plant has a total capacity of 1138.3 MW and began operating in 1987. It is owned by Exelon and operated by Constellation Nuclear. The plant utilizes a single nuclear reactor. Clinton Power Station is connected to the Midcontinent Independent Transmission System Operator (MISO) and falls within the SERC NERC region.
In the most recent year with available data, Clinton Power Station generated 8,337,539 MWh of electricity, achieving a capacity factor of 83.6%. The plant ranks 6th out of 6 power plants in Illinois and 43rd out of 55 nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
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.
812.0K MWh
Latest Month
8.3M MWh
Annual Generation
83.6%
Capacity Factor
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Market Position
ISO/RTO Market
MISO
LMP Node
20589649
Pricing Hub
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 2026-04-19
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Meta signed 20-year, 1.1 GW PPA with Constellation Energy for nuclear output from Clinton plant.
sourceConstellation announced evaluation of regulatory pathways for advanced nuclear reactor deployment at the Clinton site concurrent with Meta partnership.
sourceNRC approved 20-year license renewal for Clinton Clean Energy Center, authorizing operation through 2047.
sourceNRC 'Alert' emergency classification (second-lowest of four levels) declared at Clinton involving loss of an unspecified system; source snippet's operator attribution to 'Illinois Power Company' appears erroneous—Constellation Energy is the current operator.
source