Mosinee Mill
Other power plant · Marathon County, Wisconsin
Nameplate capacity
23 MW
Rank in Wisconsin
#79
of 278 plants
In service since
1951
August 1951
Details
- Primary fuel
- Other
- Technology
- Wood/Wood Waste Biomass
- Operator
- Ahlstrom-Munksjo NA Specialty Solutions, LLC
- County
- Marathon County
- Generating units
- 5
- Share of state capacity
- 0.12%
- Rank among other plants in Wisconsin
- #5 of 36
- EIA plant code
- 50614
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN1 | Wood/Wood Waste Biomass | 15 MW | 13 MW | 1976 | Operating |
| WEST | Wood/Wood Waste Biomass | 5.0 MW | 5.0 MW | 1951 | Operating |
| HYD1 | Conventional Hydroelectric | 2.2 MW | 2.5 MW | 2024 | Operating |
| HYD2 | Conventional Hydroelectric | 0.6 MW | 0.7 MW | 2016 | Operating |
| HYD3 | Conventional Hydroelectric | 0.6 MW | 0.7 MW | 2016 | 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
| Montfort Wind Energy Center | Wind | 30 MW |
| Custer Energy Center | Natural gas | 25 MW |
| St Croix Falls | Hydro | 23 MW |
| O'Brien Solar Fields | Solar | 22 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 23 MW solar plant and a 23 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