Castle Rock
Adams County, Wisconsin · EIA plant ID 4079 · Operator: Wisconsin River Power Company
Nameplate15MWSummer 15 MW
Generators5in service
Net generation83GWh12 mo to Dec 2025
Capacity factor63%hydro units, summer MW
Heat rate—thermal plants only
First online1950
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 94.8 | 61.8% | — |
| 2002 | 113.5 | 81.0% | — |
| 2003 | 74.5 | 53.3% | — |
| 2004 | 84.3 | 54.9% | — |
| 2005 | 68.9 | 45.0% | — |
| 2006 | 75.3 | 75.7% | — |
| 2007 | 75.5 | 47.9% | — |
| 2008 | 81 | 51.2% | — |
| 2009 | 73.4 | 45.3% | — |
| 2010 | 101.4 | 66.2% | — |
| 2011 | 104.2 | 67.9% | — |
| 2012 | 70.7 | 46.0% | — |
| 2013 | 90.8 | 59.2% | — |
| 2014 | 111.9 | 73.0% | — |
| 2015 | 95.1 | 67.9% | — |
| 2016 | 117.9 | 78.9% | — |
| 2017 | 112.3 | 75.4% | — |
| 2018 | 103.7 | 70.9% | — |
| 2019 | 109.5 | 91.9% | — |
| 2020 | 95.2 | 77.4% | — |
| 2021 | 95.9 | 78.2% | — |
| 2022 | 77.6 | 63.2% | — |
| 2023 | 75.6 | 61.7% | — |
| 2024 | 91.9 | 74.8% | — |
| 2025 | 83.3 | 63.4% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 3 | 3 | Aug 1951 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 3 | 3 | Nov 1950 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 3 | 3 | Oct 1950 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 3 | 3 | Aug 1950 | Operating | — | coming soon |
| 5 | Conventional Hydroelectric | HY | 3 | 3 | Aug 1950 | Operating | — | coming soon |
Owner / operator
Operator: Wisconsin River Power Company. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wisconsin Power & Light Co | 50.0% | 8 MW |
| Wisconsin Public Service Corp | 50.0% | 8 MW |
Nearby plants
Within 80 km.
| Emerald Bluffs Solar Park | — | 12.3 km |
| New Lisbon Solar | 3 MW | 14.9 km |
| Lemonweir (Oak 1) | 3 MW | 15 km |
| Castle Rock Lake Solar | — | 15.1 km |
| Whistling Winds DPC Solar | 2 MW | 15.3 km |
| Elroy Solar | 2 MW | 16 km |