Nameplate capacity
38 MW
Rank in Illinois
#134
of 580 plants
In service since
1946
June 1946
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- City of Waterloo - (IL)
- County
- Monroe County
- Generating units
- 14
- Share of state capacity
- 0.07%
- Rank among natural gas plants in Illinois
- #40 of 72
- EIA plant code
- 971
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 14 | Natural Gas Fired Combustion Turbine | 8.0 MW | 7.5 MW | 2026 | Operating |
| 13 | Natural Gas Fired Combustion Turbine | 7.0 MW | 6.6 MW | 2012 | Operating |
| 12 | Natural Gas Fired Combustion Turbine | 6.6 MW | 6.6 MW | 2002 | Operating |
| 1 | Petroleum Liquids | 3.1 MW | 2.7 MW | 1970 | Standby/Backup: available for service but not normally used |
| 8 | Petroleum Liquids | 3.0 MW | 2.4 MW | 1973 | Standby/Backup: available for service but not normally used |
| 4 | Petroleum Liquids | 2.0 MW | 1.8 MW | 1963 | Standby/Backup: available for service but not normally used |
| 10 | Petroleum Liquids | 1.8 MW | 1.8 MW | 1996 | Operating |
| 11 | Petroleum Liquids | 1.8 MW | 1.8 MW | 1996 | Operating |
| 9 | Petroleum Liquids | 1.8 MW | 1.8 MW | 1996 | Operating |
| 7 | Petroleum Liquids | 1.7 MW | 1.5 MW | 1959 | Standby/Backup: available for service but not normally used |
| 5 | Petroleum Liquids | 0.5 MW | 0.4 MW | 1950 | Out of service and NOT expected to return to service in next calendar year |
| 6 | Petroleum Liquids | 0.5 MW | 0.5 MW | 1950 | Out of service and NOT expected to return to service in next calendar year |
| 2 | Petroleum Liquids | 0.2 MW | 0.2 MW | 1954 | Out of service and NOT expected to return to service in next calendar year |
| 3 | Petroleum Liquids | 0.2 MW | 0.2 MW | 1946 | Out of service and NOT expected to return to service in next calendar year |
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
| Coffeen Solar BESS | Solar | 46 MW |
| ExxonMobil Oil Joliet Refinery | Natural gas | 43 MW |
| Princeton (IL) | Natural gas | 38 MW |
| Grand Ridge Battery Projects | Battery storage | 36 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 38 MW solar plant and a 38 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