Thornapple
Hydro power plant in Rusk County, Wisconsin. 1.4 MW of nameplate capacity across 2 generators, operated by Northern States Power Co - Minnesota.
Also known as EIA plant 3988
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1.4 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- January 1927First generator online
- Operator
- Northern States Power Co - MinnesotaEIA operator ID 13781
- Grid
- MISOBalancing authority MISO
- Price nodes
- None linkedNo verified ISO node
- Location
- Rusk County, WI45.4111, −91.2183
- EIA plant ID
- 3988EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Thornapple produces
Free · EIA-923Net generation, 2025
6.61 GWh
6,608 MWh, final
Capacity factor, 2025
53.9%
2024: 62.0%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
2.2–11.7
GWh a year. Low 2023, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 8,515 | Not reported | 12 of 12 |
| 2001 | 8,578 | Not reported | 12 of 12 |
| 2002 | 7,851 | Not reported | 12 of 12 |
| 2003 | 7,214 | Not reported | 12 of 12 |
| 2004 | 7,633 | Not reported | 12 of 12 |
| 2005 | 7,957 | Not reported | 12 of 12 |
| 2006 | 7,296 | Not reported | 12 of 12 |
| 2007 | 5,730 | Not reported | 12 of 12 |
| 2008 | 6,029 | Not reported | 12 of 12 |
| 2009 | 5,333 | Not reported | 12 of 12 |
| 2010 | 9,247 | 75.4% | 12 of 12 |
| 2011 | 8,025 | 65.4% | 12 of 12 |
| 2012 | 7,273 | 59.1% | 12 of 12 |
| 2013 | 8,492 | 69.2% | 12 of 12 |
| 2014 | 9,768 | 79.6% | 12 of 12 |
| 2015 | 9,835 | 80.2% | 12 of 12 |
| 2016 | 11,683 | 95.0% | 12 of 12 |
| 2017 | 11,069 | 90.3% | 12 of 12 |
| 2018 | 9,607 | 78.3% | 12 of 12 |
| 2019 | 9,784 | 79.8% | 12 of 12 |
| 2020 | 10,131 | 82.4% | 12 of 12 |
| 2021 | 3,482 | 28.4% | 12 of 12 |
| 2022 | 2,222 | 18.1% | 12 of 12 |
| 2023 | 2,215 | 18.1% | 12 of 12 |
| 2024 | 7,624 | 62.0% | 12 of 12 |
| 2025 | 6,608 | 53.9% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 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. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 0.7 | January 1927 |
| 2 | Conventional Hydroelectric | 0.7 | January 1929 |
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 Northern States Power Co - Minnesota as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Thornapple
More plants operated by Northern States Power Co - Minnesota
Questions about Thornapple
How much power does Thornapple produce?
Thornapple reported 6,608 MWh (6.61 GWh) of net generation in 2025, a 53.9% capacity factor on 1.4 MW of nameplate capacity.
Where is Thornapple?
Thornapple is in Rusk County, Wisconsin, at 45.4111, −91.2183. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Thornapple?
EIA-860M for August 2026 lists Northern States Power Co - Minnesota as the operator (EIA operator ID 13781). The operator is not always the owner.
When did Thornapple start operating?
Its first generator began operating in January 1927, 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