Onion River
Solar power plant · Sheboygan County, Wisconsin
Nameplate capacity
150 MW
Rank in Wisconsin
#33
of 278 plants
In service since
2023
December 2023
Details
- Primary fuel
- Solar
- Technology
- Solar Photovoltaic
- Operator
- Wisconsin Power & Light Co
- County
- Sheboygan County
- Generating units
- 1
- Share of state capacity
- 0.76%
- Rank among solar plants in Wisconsin
- #7 of 115
- EIA plant code
- 65008
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| PV1 | Solar Photovoltaic | 150 MW | 150 MW | 2023 | 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
| Badger Hollow I | Solar | 150 MW |
| Badger Hollow II | Solar | 150 MW |
| Two Creeks Solar | Solar | 150 MW |
| Blue Sky Green Field Wind Project | Wind | 145 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 150 MW solar plant and a 150 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