Darien Solar
Solar power plant · Rock County, Wisconsin
Nameplate capacity
250 MW
Rank in Wisconsin
#24
of 278 plants
In service since
2025
March 2025
Details
- Primary fuel
- Solar
- Technology
- Solar Photovoltaic
- Operator
- Wisconsin Electric Power Co
- County
- Rock County
- Generating units
- 1
- Share of state capacity
- 1.27%
- Rank among solar plants in Wisconsin
- #3 of 115
- EIA plant code
- 64534
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Solar Photovoltaic | 250 MW | 250 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
| Whitewater Generating Station | Natural gas | 284 MW |
| Valley (WI) | Natural gas | 275 MW |
| Wood County | Solar | 225 MW |
| De Pere Energy Center | Natural gas | 192 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 250 MW solar plant and a 250 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