Interstate
Natural gas power plant · Sangamon County, Illinois
Nameplate capacity
139 MW
Rank in Illinois
#93
of 580 plants
In service since
1997
September 1997
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- City of Springfield - (IL)
- County
- Sangamon County
- Generating units
- 1
- Share of state capacity
- 0.26%
- Rank among natural gas plants in Illinois
- #33 of 72
- EIA plant code
- 7425
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Natural Gas Fired Combustion Turbine | 139 MW | 110 MW | 1997 | 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
| Big River Solar | Solar | 149 MW |
| Wolf Run Solar | Solar | 140 MW |
| Prairie Solar LLC | Solar | 135 MW |
| Ford County Wind Farm LLC | Wind | 121 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 139 MW solar plant and a 139 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