Red Rock Hydro Plant
Hydro power plant · Marion County, Iowa
Nameplate capacity
55 MW
Rank in Iowa
#102
of 305 plants
In service since
2021
May 2021
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Western Minnesota Mun Pwr Agny
- County
- Marion County
- Generating units
- 2
- Share of state capacity
- 0.22%
- Rank among hydro plants in Iowa
- #2 of 4
- EIA plant code
- 58434
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 28 MW | 28 MW | 2021 | Operating |
| 2 | Conventional Hydroelectric | 28 MW | 28 MW | 2021 | 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 Iowa
| Saratoga Wind Farm | Wind | 66 MW |
| Independence Wind Farm | Wind | 55 MW |
| Streeter Station | Natural gas | 52 MW |
| Creston Solar (50 MW) | Solar | 50 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 55 MW solar plant and a 55 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 Iowa power plants · What Iowa actually generates