Castle Rock
Castle Rock is a 15 MW hydroelectric power plant in Adams County, Wisconsin, operated by Wisconsin River Power Company. EIA-860M lists 5 generating units here, inside MISO. Its units entered service between 1950 and 1951.
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
- 15 MW
- 15 MW net summer
- Generating units
- 5
- In service
- 1950–1951
- EIA plant ID
- 4079
Where it is
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- County
- Adams County, Wisconsin
- Coordinates
- 43.8656, -89.9514
- Balancing authority
- MISO
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- Wisconsin River Power Company
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Castle Rock: FAQ
- Where is Castle Rock?
- In Adams County, Wisconsin (WI). 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 Castle Rock?
- 15 MW of nameplate capacity across 5 units, as of the EIA-860M release for 2026-07.
- Who owns Castle Rock?
- EIA-860M names Wisconsin River Power Company 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 Castle Rock LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Wisconsin River Power Company 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 "Castle Rock LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Castle Rock still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.