NRG Rockford II Energy Center
Natural gas power plant · Winnebago County, Illinois
Nameplate capacity
168 MW
Rank in Illinois
#78
of 580 plants
In service since
2002
June 2002
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- Rockford Generation LLC
- County
- Winnebago County
- Generating units
- 1
- Share of state capacity
- 0.32%
- Rank among natural gas plants in Illinois
- #32 of 72
- EIA plant code
- 55936
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GT3 | Natural Gas Fired Combustion Turbine | 168 MW | 181 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
| Alsey | Natural gas | 173 MW |
| Moraine Sands Wind Power | Wind | 171 MW |
| River Ferry Solar 1 | Solar | 165 MW |
| Pioneer Trail Wind Farm, LLC | Wind | 150 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 168 MW solar plant and a 168 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