Red Rock Hydro Plant
Hydro power plant in Marion County, Iowa. 55.2 MW of nameplate capacity across 2 generators, operated by Western Minnesota Mun Pwr Agny.
Also known as Red Rock Hydroelectric Project · EIA plant 58434
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 55.2 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- May 2021First generator online
- Operator
- Western Minnesota Mun Pwr AgnyEIA operator ID 20421
- Grid
- MISOBalancing authority MISO
- Price nodes
- 2 MISO nodesResource nodes with prices
- Location
- Marion County, IA41.3697, −92.9808
- EIA plant ID
- 58434EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Red Rock Hydro Plant produces
Free · EIA-923Net generation, 2025
179 GWh
179,271 MWh, final
Capacity factor, 2025
37.1%
2024: 28.0%
January to July 2026
140 GWh
Provisional
Range, 2022 to 2025
103.3–179.3
GWh a year. Low 2022, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | 33,878 | Not reported | 7 of 12 |
| 2022 | 103,269 | 21.4% | 12 of 12 |
| 2023 | 103,592 | 21.4% | 12 of 12 |
| 2024 | 135,978 | 28.0% | 12 of 12 |
| 2025 | 179,271 | 37.1% | 12 of 12 |
| 2026 (provisional, partial year) | 139,502 | 49.7% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · MISOEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 27.6 | June 2021 |
| 2 | Conventional Hydroelectric | 27.6 | May 2021 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Western Minnesota Mun Pwr Agny as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Red Rock Hydro Plant
More plants operated by Western Minnesota Mun Pwr Agny
Questions about Red Rock Hydro Plant
How much power does Red Rock Hydro Plant produce?
Red Rock Hydro Plant reported 179,271 MWh (179 GWh) of net generation in 2025, a 37.1% capacity factor on 55.2 MW of nameplate capacity. From January to July 2026 it reported 140 GWh, which is provisional.
Where is Red Rock Hydro Plant?
Red Rock Hydro Plant is in Marion County, Iowa, at 41.3697, −92.9808. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Red Rock Hydro Plant?
EIA-860M for August 2026 lists Western Minnesota Mun Pwr Agny as the operator (EIA operator ID 20421). The operator is not always the owner.
When did Red Rock Hydro Plant start operating?
Its first generator began operating in May 2021, according to EIA-860M.
Does InfraMap have power prices for Red Rock Hydro Plant?
Yes. InfraMap has MISO day-ahead and real-time prices at 2 price nodes linked to Red Rock Hydro Plant, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page