Byron Generating Station
Nuclear power plant · Ogle County, Illinois
Nameplate capacity
2,450 MW
Rank in Illinois
#2
of 580 plants
In service since
1985
September 1985
Details
- Primary fuel
- Nuclear
- Technology
- Nuclear
- Operator
- Constellation Nuclear
- County
- Ogle County
- Generating units
- 2
- Share of state capacity
- 4.65%
- Rank among nuclear plants in Illinois
- #2 of 6
- EIA plant code
- 6023
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Nuclear | 1,225 MW | 1,164 MW | 1985 | Operating |
| 2 | Nuclear | 1,225 MW | 1,136 MW | 1987 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Illinois
| Braidwood Generation Station | Nuclear | 2,450 MW |
| LaSalle Generating Station | Nuclear | 2,340 MW |
| Dresden Generating Station | Nuclear | 2,019 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 2,450 MW solar plant and a 2,450 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Illinois power plants · What Illinois actually generates