Castle Rock
Hydro power plant in Adams County, Wisconsin. 15 MW of nameplate capacity across 5 generators, operated by Wisconsin River Power Company.
Also known as Castle Rock Power Plant · EIA plant 4079
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 15 MWNameplate
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- August 1950First generator online
- Operator
- Wisconsin River Power CompanyEIA operator ID 20863
- Grid
- MISOBalancing authority MISO
- Price nodes
- 2 MISO nodesResource nodes with prices
- Location
- Adams County, WI43.8656, −89.9514
- EIA plant ID
- 4079EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Castle Rock produces
Free · EIA-923Net generation, 2025
83.3 GWh
83,344 MWh, final
Capacity factor, 2025
63.4%
2024: 69.8%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
75.6–117.9
GWh a year. Low 2023, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 0 | Not reported | 12 of 12 |
| 2001 | 94,778 | Not reported | 12 of 12 |
| 2002 | 113,542 | Not reported | 12 of 12 |
| 2003 | 74,451 | Not reported | 12 of 12 |
| 2004 | 84,311 | Not reported | 12 of 12 |
| 2005 | 68,932 | Not reported | 12 of 12 |
| 2006 | 75,269 | Not reported | 12 of 12 |
| 2007 | 75,529 | Not reported | 12 of 12 |
| 2008 | 81,031 | Not reported | 12 of 12 |
| 2009 | 73,363 | Not reported | 12 of 12 |
| 2010 | 101,447 | 77.2% | 12 of 12 |
| 2011 | 104,156 | 79.3% | 12 of 12 |
| 2012 | 70,745 | 53.7% | 12 of 12 |
| 2013 | 90,806 | 69.1% | 12 of 12 |
| 2014 | 111,912 | 85.2% | 12 of 12 |
| 2015 | 95,138 | 72.4% | 12 of 12 |
| 2016 | 117,866 | 89.5% | 12 of 12 |
| 2017 | 112,297 | 85.5% | 12 of 12 |
| 2018 | 103,669 | 78.9% | 12 of 12 |
| 2019 | 109,498 | 83.3% | 12 of 12 |
| 2020 | 95,152 | 72.2% | 12 of 12 |
| 2021 | 95,874 | 73.0% | 12 of 12 |
| 2022 | 77,567 | 59.0% | 12 of 12 |
| 2023 | 75,636 | 57.6% | 12 of 12 |
| 2024 | 91,948 | 69.8% | 12 of 12 |
| 2025 | 83,344 | 63.4% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 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 | 3.0 | August 1951 |
| 2 | Conventional Hydroelectric | 3.0 | November 1950 |
| 3 | Conventional Hydroelectric | 3.0 | October 1950 |
| 4 | Conventional Hydroelectric | 3.0 | August 1950 |
| 5 | Conventional Hydroelectric | 3.0 | August 1950 |
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 Wisconsin River Power Company as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
300 analyst questions a month, plus MCP
Query Castle Rock and 14,224 other projects from Claude or your own tools. Free accounts get 1 question a day.
Power plants near Castle Rock
More plants operated by Wisconsin River Power Company
Questions about Castle Rock
How much power does Castle Rock produce?
Castle Rock reported 83,344 MWh (83.3 GWh) of net generation in 2025, a 63.4% capacity factor on 15 MW of nameplate capacity.
Where is Castle Rock?
Castle Rock is in Adams County, Wisconsin, at 43.8656, −89.9514. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Castle Rock?
EIA-860M for August 2026 lists Wisconsin River Power Company as the operator (EIA operator ID 20863). The operator is not always the owner.
When did Castle Rock start operating?
Its first generator began operating in August 1950, according to EIA-860M.
Does InfraMap have power prices for Castle Rock?
Yes. InfraMap has MISO day-ahead and real-time prices at 2 price nodes linked to Castle Rock, 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