Red Rock Hydro Plant
Red Rock Hydro Plant is a 55 MW hydroelectric power plant in Marion County, Iowa, operated by Western Minnesota Mun Pwr Agny. EIA-860M lists 2 generating units here, inside MISO. Its units entered service in 2021.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 55.2 MW
- 55 MW net summer
- Generating units
- 2
- In service
- 2021
- EIA plant ID
- 58434
Where it is
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- County
- Marion County, Iowa
- Coordinates
- 41.3697, -92.9808
- Balancing authority
- MISO
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- Western Minnesota Mun Pwr Agny
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Red Rock Hydro Plant: FAQ
- Where is Red Rock Hydro Plant?
- In Marion County, Iowa (IA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Red Rock Hydro Plant?
- 55 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
- Who owns Red Rock Hydro Plant?
- EIA-860M names Western Minnesota Mun Pwr Agny as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Red Rock Hydro Plant LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Western Minnesota Mun Pwr Agny here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Red Rock Hydro Plant LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Red Rock Hydro Plant still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.