O'Fallon Renewable Energy Center
Solar power plant · St Charles County, Missouri
Nameplate capacity
4.5 MW
Rank in Missouri
#111
of 139 plants
In service since
2014
December 2014
Details
- Primary fuel
- Solar
- Technology
- Solar Photovoltaic
- Operator
- Union Electric Co - (MO)
- County
- St Charles County
- Generating units
- 1
- Share of state capacity
- 0.02%
- Rank among solar plants in Missouri
- #21 of 37
- EIA plant code
- 61826
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| OREC | Solar Photovoltaic | 4.5 MW | 4.5 MW | 2014 | 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 Missouri
| Springfield Solar 1 LLC | Solar | 4.9 MW |
| Shelbina Power #1 | Other | 4.6 MW |
| Stanberry | Natural gas | 4.3 MW |
| Black Oak Power Producers | Other | 4.0 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 4.5 MW solar plant and a 4.5 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 Missouri power plants · What Missouri actually generates