Wausau
Marathon County, Wisconsin · EIA plant ID 4077 · Operator: Wisconsin Public Service Corp
Nameplate5MWSummer 5 MW
Generators3in service
Net generation24GWh12 mo to Dec 2025
Capacity factor52%hydro units, summer MW
Heat rate—thermal plants only
First online1921
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), hydro 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 30.3 | 128.2% | — |
| 2002 | 37.5 | 142.7% | — |
| 2003 | 26.9 | 105.6% | — |
| 2004 | 26 | 101.8% | — |
| 2005 | 22.4 | 85.2% | — |
| 2006 | 24.1 | 76.6% | — |
| 2007 | 20 | 63.4% | — |
| 2008 | 19.2 | 60.6% | — |
| 2009 | 16.9 | 53.6% | — |
| 2010 | 27.2 | 86.3% | — |
| 2011 | 30.2 | 95.7% | — |
| 2012 | 17.8 | 56.2% | — |
| 2013 | 28.1 | 89.2% | — |
| 2014 | 31.6 | 100.2% | — |
| 2015 | 31.3 | 118.9% | — |
| 2016 | 40.4 | 153.2% | — |
| 2017 | 39.7 | 151.2% | — |
| 2018 | 23.1 | 87.8% | — |
| 2019 | 15.9 | 33.6% | — |
| 2020 | 41.4 | 87.2% | — |
| 2021 | 30.5 | 64.5% | — |
| 2022 | 29 | 61.4% | — |
| 2023 | 22.8 | 48.2% | — |
| 2024 | 18.6 | 39.1% | — |
| 2025 | 24.5 | 51.7% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 1.8 | 1.8 | Mar 1921 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 1.8 | 1.8 | May 1921 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 1.8 | 1.8 | Mar 1924 | Operating | — | coming soon |
Owner / operator
Operator: Wisconsin Public Service Corp. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wisconsin Public Service Corp | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Rothschild Biomass Cogen Facility | 58 MW | 7.8 km |
| Domtar Paper Company Rothschild | 1 MW | 7.9 km |
| Weston | 946 MW | 10.9 km |
| Weston RICE | 132 MW | 11.3 km |
| Mosinee Mill | 23 MW | 19.3 km |
| Fiber Recovery, Inc. | retired | 21.2 km |