Thornapple
Rusk County, Wisconsin · EIA plant ID 3988 · Operator: Northern States Power Co - Minnesota
Nameplate1MWSummer 1 MW
Generators2in service
Net generation7GWh12 mo to Dec 2025
Capacity factor94%hydro units, summer MW
Heat rate—thermal plants only
First online1927
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 | 8.6 | 65.3% | — |
| 2002 | 7.9 | 59.8% | — |
| 2003 | 7.2 | 49.3% | — |
| 2004 | 7.6 | 52.0% | — |
| 2005 | 8 | 54.4% | — |
| 2006 | 7.3 | 49.9% | — |
| 2007 | 5.7 | 38.5% | — |
| 2008 | 6 | 40.4% | — |
| 2009 | 5.3 | 35.8% | — |
| 2010 | 9.2 | 62.1% | — |
| 2011 | 8 | 114.5% | — |
| 2012 | 7.3 | 103.5% | — |
| 2013 | 8.5 | 121.2% | — |
| 2014 | 9.8 | 139.4% | — |
| 2015 | 9.8 | 140.3% | — |
| 2016 | 11.7 | 166.3% | — |
| 2017 | 11.1 | 157.9% | — |
| 2018 | 9.6 | 137.1% | — |
| 2019 | 9.8 | 139.6% | — |
| 2020 | 10.1 | 144.2% | — |
| 2021 | 3.5 | 49.7% | — |
| 2022 | 2.2 | 31.7% | — |
| 2023 | 2.2 | 31.6% | — |
| 2024 | 7.6 | 108.5% | — |
| 2025 | 6.6 | 94.3% | — |
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 | 0.7 | 0.4 | Jan 1927 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 0.7 | 0.4 | Jan 1929 | Operating | — | coming soon |
Owner / operator
Operator: Northern States Power Co - Minnesota. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Northern States Power Co - Minnesota | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Timberline Trail Gas Recovery | 3 MW | 11.9 km |
| Ladysmith Dam | 3 MW | 12.1 km |
| Conrath DPC Solar | 1 MW | 14.2 km |
| Flambeau Hydroelectric Station | 19 MW | 16.1 km |
| Big Falls | 8 MW | 16.1 km |
| Holcombe | 34 MW | 22 km |