Constellation Energy Generation, LLC · Ogle County · PJM
Byron Generating Station is a nuclear power facility with 2,449.8 MW of EIA-reported nameplate capacity in Ogle County, Illinois, registered as EIA Plant ID 6023. Constellation Nuclear owns and operates the plant. The plant's generating configuration is two operating nuclear units, each a Westinghouse four-loop pressurized-water reactor (PWR). The facility interconnects at COMED at 345 kV.
Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
Constellation Nuclear · Ogle County · PJM
Byron Generating Station is operating.
Nuclear
Byron Generating Station is operating.
PJM
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 1,224.9 MW 1,164 MW summer | Nuclear Nuclear · ST | Sep 1985 Retirement: Sep 2021 | Operating |
| 2 | 1,224.9 MW 1,136 MW summer | Nuclear Nuclear · ST | Aug 1987 Retirement: Sep 2021 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Project milestones and public references behind the asset profile.
The NRC issued Byron's construction permit.
PJM · Ogle County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Peach Bottom | 2,876.4 MW | PA | |
| Braidwood Generation Station | 2,449.8 MW | IL | |
| Byron Generating StationCurrent | 2,449.8 MW | IL | |
| LaSalle Generating Station | 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 portfolioEIA-860 lists generator 1 with this operating date.
EIA-860 lists generator 2 with this operating date.
The NRC approved initial license renewal, authorizing Byron Unit 1 to operate through 2044 and Unit 2 through 2046.
Exelon Generation announced an intention to retire Byron in September 2021.
EIA-860 lists a planned retirement for generator 1, generator 2.
Exelon completed the separation of Constellation. Exelon contributed its equity interest in Generation to Constellation, and Exelon shareholders received Constellation shares; this was not described as a standalone sale of Byron.
Constellation announced an $800 million equipment program for the Byron and Braidwood stations, involving replacement of the main turbines. The combined projects were expected to add approximately 135 MW, with increased output beginning as early as 2026 and full uprated output by 2029.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Byron Generating Station has a reported capacity of 2,449.8 MW. Source: EIA Form 860.
Byron Generating Station is a nuclear facility in Ogle County, IL, participating in the PJM market.
Byron Generating Station is in Ogle County, IL, inside the PJM balancing area.
Byron Generating Station is operated by Constellation Nuclear according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Byron Generating Station reported 19,491 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.
By capacity, Byron Generating Station ranks #9 of 54 operating plants of the same technology nationally. It ranks #1 of 6 in IL.
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.
Similar plants ranked by technology, capacity, and distance.
Nuclear · 2,340 MW
LaSalle County
Nuclear · 2,449.8 MW
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Nuclear · 2,018.6 MW
Rock Island County
Nuclear · 2,018.6 MW
Grundy County