Mosinee Mill
Marathon County, Wisconsin · EIA plant ID 50614 · Operator: Expera Mosinee LLC
Nameplate23MWSummer 22 MW
Generators5in service
Net generation87GWh12 mo to Aug 2026
Capacity factor24%other units, summer MW
Heat rate5,249Btu/kWhfossil units, electric fuel, HHV
First online1916
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), other units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 125.7 | 45.3% | — |
| 2002 | 123.7 | 41.0% | — |
| 2003 | 20.6 | — | — |
| 2004 | 0 | 0.0% | — |
| 2005 | 119.3 | 55.1% | 4,513 |
| 2006 | 124 | 56.9% | 4,513 |
| 2007 | 125.6 | 38.5% | 4,513 |
| 2008 | 128.4 | 37.6% | 4,334 |
| 2009 | 121.8 | 42.7% | 4,334 |
| 2010 | 126.1 | 44.3% | 4,334 |
| 2011 | 138.2 | 48.4% | 4,334 |
| 2012 | 131.8 | 50.0% | 4,334 |
| 2013 | 134 | 42.9% | 4,334 |
| 2014 | 142.9 | 45.7% | 4,334 |
| 2015 | 137.8 | 41.8% | 4,334 |
| 2016 | 138.1 | 42.4% | 5,297 |
| 2017 | 124.9 | 40.2% | 5,249 |
| 2018 | 136.5 | 42.3% | 5,249 |
| 2019 | 126.9 | 38.2% | 5,249 |
| 2020 | 114.8 | 35.7% | 5,249 |
| 2021 | 127 | 37.5% | 5,249 |
| 2022 | 125.6 | 38.8% | 5,249 |
| 2023 | 119 | 34.3% | 5,288 |
| 2024 | 122.9 | 32.1% | 5,249 |
| 2025 | 118 | 44.4% | 5,249 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Wood/Wood Waste Biomass | ST | 15 | 13 | Dec 1976 | Operating | — | coming soon |
| HYD1 | Conventional Hydroelectric | HY | 2.2 | 2.5 | Aug 1924 | Operating | — | coming soon |
| HYD2 | Conventional Hydroelectric | HY | 0.6 | 0.7 | Jul 1916 | Operating | — | coming soon |
| HYD3 | Conventional Hydroelectric | HY | 0.6 | 0.7 | Jul 1916 | Operating | — | coming soon |
| WEST | Wood/Wood Waste Biomass | ST | 5 | 5 | Aug 1951 | Operating | — | coming soon |
Owner / operator
Operator: Expera Mosinee LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Expera Mosinee LLC | 100.0% | 23 MW |
Nearby plants
Within 80 km.
| Weston RICE | 132 MW | 8.2 km |
| Weston | 946 MW | 8.6 km |
| Domtar Paper Company Rothschild | 1 MW | 12.1 km |
| Rothschild Biomass Cogen Facility | 58 MW | 12.1 km |
| Du Bay | 7 MW | 14.1 km |
| Wausau | 5 MW | 19.3 km |