Nameplate capacity
586 MW
Rank in Illinois
#26
of 580 plants
In service since
2002
June 2002
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- Union Electric Co - (MO)
- County
- Madison County
- Generating units
- 4
- Share of state capacity
- 1.11%
- Rank among natural gas plants in Illinois
- #14 of 72
- EIA plant code
- 913
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GT3 | Natural Gas Fired Combustion Turbine | 200 MW | 169 MW | 2005 | Operating |
| GT4 | Natural Gas Fired Combustion Turbine | 200 MW | 169 MW | 2005 | Operating |
| GT5 | Natural Gas Fired Combustion Turbine | 125 MW | 104 MW | 2005 | Operating |
| GT2 | Natural Gas Fired Combustion Turbine | 61 MW | 44 MW | 2002 | 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
| Zion Energy Center | Natural gas | 597 MW |
| Double Back Diamond | Solar | 593 MW |
| Elwood Energy LLC | Natural gas | 576 MW |
| MRP Elgin LLC | Natural gas | 540 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 586 MW solar plant and a 586 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