Rock LakeSolar WI, LLC
Solar power plant · Jefferson County, Wisconsin
Nameplate capacity
5.0 MW
Rank in Wisconsin
#163
of 278 plants
In service since
2025
November 2025
Details
- Primary fuel
- Solar
- Technology
- Solar Photovoltaic
- Operator
- Wisconsin Electric Power Co
- County
- Jefferson County
- Generating units
- 1
- Share of state capacity
- 0.03%
- Rank among solar plants in Wisconsin
- #50 of 115
- EIA plant code
- 69431
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 20252 | Solar Photovoltaic | 5.0 MW | 5.0 MW | 2025 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Wisconsin
| Ledgeview | Solar | 5.0 MW |
| Portage Industrial Battery | Battery storage | 5.0 MW |
| Washington Island | Other | 5.0 MW |
| Kaukauna City Hydro | Hydro | 4.8 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 5.0 MW solar plant and a 5.0 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Wisconsin power plants · What Wisconsin actually generates