O'Fallon Renewable Energy Center
St. Charles County, Missouri · EIA plant ID 61826 · Operator: Union Electric Co - (MO)
Nameplate5MWSummer 5 MW
Generators1in service
Net generation1GWh12 mo to Dec 2025
Capacity factor2%solar units, summer MW
Heat rate—thermal plants only
First online2014
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), solar units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2017 | 5.9 | 15.1% | — |
| 2018 | 6.1 | 15.6% | — |
| 2019 | 6.2 | 15.6% | — |
| 2020 | 5.9 | 15.0% | — |
| 2021 | 6.1 | 15.4% | — |
| 2022 | 4.2 | 10.6% | — |
| 2023 | 5.3 | 13.3% | — |
| 2024 | 2.3 | 5.8% | — |
| 2025 | 0.6 | 1.5% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| OREC | Solar Photovoltaic | PV | 4.5 | 4.5 | Dec 2014 | Operating | — | coming soon |
Owner / operator
Operator: Union Electric Co - (MO). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Union Electric Co - (MO) | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Winfield Solar | 150 MW | 26.4 km |
| Labadie | 2,389 MW | 32.5 km |
| Sioux | 1,099 MW | 35 km |
| Blue Bird Solar, LLC | 139 MW | 40.4 km |
| Renewable Energy Center at BJH | 2 MW | 42.1 km |
| IKEA St. Louis 410 | 1 MW | 43.2 km |