Nameplate capacity
249 MW
Rank in Illinois
#50
of 580 plants
In service since
1963
June 1963
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- Southern Illinois Power Coop
- County
- Williamson County
- Generating units
- 5
- Share of state capacity
- 0.47%
- Rank among natural gas plants in Illinois
- #28 of 72
- EIA plant code
- 976
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 5 | Natural Gas Fired Combustion Turbine | 75 MW | 70 MW | 2003 | Operating |
| 6 | Natural Gas Fired Combustion Turbine | 75 MW | 70 MW | 2003 | Operating |
| 1 | Conventional Steam Coal | 33 MW | 40 MW | 1963 | Operating |
| 2 | Conventional Steam Coal | 33 MW | 40 MW | 1963 | Operating |
| 3 | Conventional Steam Coal | 33 MW | 40 MW | 1963 | 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
| Blooming Grove Wind Energy Center | Wind | 250 MW |
| Maple Flats | Solar | 250 MW |
| Big Sky Wind LLC | Wind | 239 MW |
| FPL Energy Illinois Wind LLC Hybrid | Wind | 238 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 249 MW solar plant and a 249 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