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2449.8 MW Nuclear operating in Ogle, IL
2,449.8 MW
Nameplate Capacity
2
Generators
units
Nuclear
Technology
1985
Operating Since
Coordinates
42.0742, -89.2819
County
Ogle, 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 | — |
The Byron Clean Energy Center is a nuclear power plant located in Ogle County, Illinois, 2 miles (3.2 km) east of the Rock River. The reactor buildings were constructed by Commonwealth Edison and house two Westinghouse Four-Loop pressurized water reactors, Unit 1 and Unit 2, which began operation in September 1985 and August 1987 respectively. The plant is owned and operated by Constellation Energy.
Read more on WikipediaByron Generating Station is a 2,449.8 MW nuclear power plant located in Ogle County, Illinois. The plant began operating in 1985 and is owned by Exelon, with Constellation Nuclear as the operator. It consists of two nuclear reactors. Byron is the second-largest nuclear plant in Illinois (out of six) and the tenth-largest in the United States (out of 55).
The plant's latest annual generation was 19,914,452 MWh, achieving a capacity factor of 92.8%. Byron Generating Station is part of the PJM Interconnection balancing authority and the RFC NERC region.
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.
1.8M MWh
Latest Month
19.9M MWh
Annual Generation
92.8%
Capacity Factor
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No financial data available for this plant.
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Point of Interconnection
Nearest Substation
Byron Station · 345 kV
Substation Distance
< 10 km
Operator
Commonwealth Edison
Coord Source
OSM spatial
Market Position
ISO/RTO Market
PJM
LMP Node
86041201
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 2026-03-14
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Illinois Climate and Equitable Jobs Act signed, providing ~$695M in zero-emission credits to keep Byron (and Dresden) nuclear plants operating and reversing planned 2021 retirement.
sourceLarge turbine component delivered via heavy-haul convoy for $355M turbine upgrade project at Byron nuclear plant.
sourceOSHA opened investigation after chemical exposure at Byron Generating Station sent 10 employees to hospital; Ogle County mass-casualty emergency response activated.
source