Johnson Falls
Marinette County, Wisconsin · EIA plant ID 4067 · Operator: Wisconsin Public Service Corp
Nameplate3MWSummer 3 MW
Generators2in service
Net generation11GWh12 mo to Dec 2025
Capacity factor36%hydro units, summer MW
Heat rate—thermal plants only
First online1923
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 | 9 | 25.6% | — |
| 2002 | 12.4 | 176.2% | — |
| 2003 | 10.1 | 144.2% | — |
| 2004 | 11.7 | 166.7% | — |
| 2005 | 7.8 | 98.6% | — |
| 2006 | 8.4 | 106.0% | — |
| 2007 | 7.3 | 52.1% | — |
| 2008 | 8 | 56.8% | — |
| 2009 | 5.8 | 41.3% | — |
| 2010 | 7.9 | 56.7% | — |
| 2011 | 8 | 57.1% | — |
| 2012 | 7.2 | 51.4% | — |
| 2013 | 9.6 | 78.0% | — |
| 2014 | 12.2 | 99.4% | — |
| 2015 | 12.7 | 145.5% | — |
| 2016 | 12.7 | 144.2% | — |
| 2017 | 15.9 | 181.3% | — |
| 2018 | 11.2 | 127.5% | — |
| 2019 | 12 | 40.2% | — |
| 2020 | 16.5 | 55.2% | — |
| 2021 | 10.8 | 36.4% | — |
| 2022 | 10.9 | 36.6% | — |
| 2023 | 10.3 | 34.5% | — |
| 2024 | 10.2 | 34.3% | — |
| 2025 | 10.7 | 35.9% | — |
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 | 1.7 | 1.7 | Jul 1923 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 1.7 | 1.7 | Jul 1923 | 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% | 3 MW |
Nearby plants
Within 80 km.
| High Falls (WI) | 7 MW | 3.2 km |
| Sandstone Rapids | 4 MW | 9.4 km |
| Caldron Falls | 6 MW | 9.5 km |
| White Rapids | 8 MW | 35.4 km |
| Potato Rapids | 1 MW | 36.9 km |
| Chalk Hill | 8 MW | 37.7 km |