Power plants in Marion County, Iowa
4 operating power plants in Marion County, Iowa, with 100 MW of nameplate capacity, largest first. From EIA-860M, August 2026.
Largest power plants in Marion County
| # | Plant | MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | Red Rock Hydro PlantHydro | 55 | 179 | 37.1% |
| 2 | Pella PeakingOil | 28 | 0.8 | 0.3% |
| 3 | Knoxville IndustrialOil | 16 | 0.2 | 0.2% |
| 4 | Knoxville Battery Energy StorageBattery storage | 1.1 | −0.0 | – |
MW is the nameplate capacity of operating generators and batteries. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources
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