Red Rock Hydro Plant
Marion County, Iowa · EIA plant ID 58434 · Operator: Western Minnesota Mun Pwr Agny
Nameplate55MWSummer 55 MW
Generators2in service
Net generation184GWh12 mo to Aug 2026
Capacity factor38%hydro units, summer MW
Heat rate—thermal plants only
First online2021
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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), hydro 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) |
|---|---|---|---|
| 2021 | 33.9 | 11.2% | — |
| 2022 | 103.3 | 21.4% | — |
| 2023 | 103.6 | 21.5% | — |
| 2024 | 136 | 28.1% | — |
| 2025 | 179.3 | 37.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 27.6 | 27.5 | Jun 2021 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 27.6 | 27.5 | May 2021 | Operating | — | coming soon |
Owner / operator
Operator: Western Minnesota Mun Pwr Agny. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Western Minnesota Mun Pwr Agny | 100.0% | 55 MW |
Nearby plants
Within 80 km.
| Pella Peaking | 28 MW | 5.8 km |
| Knoxville Battery Energy Storage | 1 MW | 9 km |
| Knoxville Industrial | 16 MW | 9 km |
| Prairie Wind Farm | 168 MW | 24.3 km |
| Cargill Corn Milling Division | 40 MW | 38 km |
| Metro Methane Recovery Facility | 11 MW | 40.3 km |