Mosinee Mill
Wood biomass power plant in Marathon County, Wisconsin. 23.4 MW of nameplate capacity across 5 generators, operated by Ahlstrom-Munksjo NA Specialty Solutions, LLC.
Also known as EIA plant 50614
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 23.4 MWWood biomass 20.0 · Hydro 3.4
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- July 1916First generator online
- Operator
- Ahlstrom-Munksjo NA Specialty Solutions, LLCEIA operator ID 13008
- Grid
- MISOBalancing authority MISO
- Price nodes
- None linkedNo verified ISO node
- Location
- Marathon County, WI44.7881, −89.6917
- EIA plant ID
- 50614EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Mosinee Mill produces
Free · EIA-923Net generation, 2025
11.1 GWh
11,084 MWh, final. 1 of 12 months reported
Capacity factor, 2025
63.7%
2024: Not reported
January to July 2026
44.0 GWh
Provisional
Range, 2015 to 2024
114.8–138.1
GWh a year. Low 2020, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 125,682 | Not reported | 12 of 12 |
| 2002 | 22,321 | Not reported | 2 of 12 |
| 2003 | 20,617 | Not reported | 12 of 12 |
| 2004 | 0 | Not reported | 12 of 12 |
| 2005 | 119,332 | Not reported | 12 of 12 |
| 2006 | 124,035 | Not reported | 12 of 12 |
| 2007 | 125,589 | Not reported | 12 of 12 |
| 2008 | 128,390 | Not reported | 12 of 12 |
| 2009 | 121,764 | Not reported | 12 of 12 |
| 2010 | 126,053 | 61.5% | 12 of 12 |
| 2011 | 138,204 | 67.4% | 12 of 12 |
| 2012 | 131,788 | 64.1% | 12 of 12 |
| 2013 | 134,013 | 65.4% | 12 of 12 |
| 2014 | 142,873 | 69.7% | 12 of 12 |
| 2015 | 137,825 | 67.2% | 12 of 12 |
| 2016 | 138,113 | 67.2% | 12 of 12 |
| 2017 | 124,883 | 66.0% | 11 of 12 |
| 2018 | 136,504 | 66.6% | 12 of 12 |
| 2019 | 126,908 | 61.9% | 12 of 12 |
| 2020 | 114,765 | 55.8% | 12 of 12 |
| 2021 | 126,960 | 61.9% | 12 of 12 |
| 2022 | 125,589 | 61.3% | 12 of 12 |
| 2023 | 119,010 | 58.1% | 12 of 12 |
| 2024 | 122,929 | Not reported | 12 of 12 |
| 2025 | 11,084 | 63.7% | 1 of 12 |
| 2026 (provisional, partial year) | 44,014 | 37.0% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN1 | Wood/Wood Waste Biomass | 15.0 | December 1976 |
| HYD1 | Conventional Hydroelectric | 2.2 | August 1924 |
| HYD2 | Conventional Hydroelectric | 0.6 | July 1916 |
| HYD3 | Conventional Hydroelectric | 0.6 | July 1916 |
| WEST | Wood/Wood Waste Biomass | 5.0 | August 1951 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Ahlstrom-Munksjo NA Specialty Solutions, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Mosinee Mill
How much power does Mosinee Mill produce?
Mosinee Mill reported 11,084 MWh (11.1 GWh) of net generation in 2025, a 63.7% capacity factor on 23.4 MW of nameplate capacity. From January to July 2026 it reported 44.0 GWh, which is provisional. 1 of 12 months were reported for 2025.
Where is Mosinee Mill?
Mosinee Mill is in Marathon County, Wisconsin, at 44.7881, −89.6917. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Mosinee Mill?
EIA-860M for August 2026 lists Ahlstrom-Munksjo NA Specialty Solutions, LLC as the operator (EIA operator ID 13008). The operator is not always the owner.
When did Mosinee Mill start operating?
Its first generator began operating in July 1916, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page