Grandfather Falls
Hydro power plant in Lincoln County, Wisconsin. 17.2 MW of nameplate capacity across 2 generators, operated by Wisconsin Public Service Corp.
Also known as Grandfather Falls Hydroelectric Plant P-1966 · EIA plant 4063
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 17.2 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- December 1938First generator online
- Operator
- Wisconsin Public Service CorpEIA operator ID 20860
- Grid
- MISOBalancing authority MISO
- Price nodes
- 1 MISO nodeResource nodes with prices
- Location
- Lincoln County, WI45.3019, −89.7917
- EIA plant ID
- 4063EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Grandfather Falls produces
Free · EIA-923Net generation, 2025
79.1 GWh
79,055 MWh, final
Capacity factor, 2025
52.5%
2024: 53.2%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
56.5–123.1
GWh a year. Low 2017, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 84,661 | Not reported | 12 of 12 |
| 2001 | 82,995 | Not reported | 12 of 12 |
| 2002 | 116,148 | Not reported | 12 of 12 |
| 2003 | 83,545 | Not reported | 12 of 12 |
| 2004 | 85,493 | Not reported | 12 of 12 |
| 2005 | 72,133 | Not reported | 12 of 12 |
| 2006 | 76,828 | Not reported | 12 of 12 |
| 2007 | 64,045 | Not reported | 12 of 12 |
| 2008 | 66,092 | Not reported | 12 of 12 |
| 2009 | 51,163 | Not reported | 12 of 12 |
| 2010 | 78,563 | 52.1% | 12 of 12 |
| 2011 | 89,462 | 59.4% | 12 of 12 |
| 2012 | 58,960 | 39.0% | 12 of 12 |
| 2013 | 63,745 | 42.3% | 12 of 12 |
| 2014 | 115,197 | 76.5% | 12 of 12 |
| 2015 | 97,266 | 64.6% | 12 of 12 |
| 2016 | 123,075 | 81.5% | 12 of 12 |
| 2017 | 56,487 | 37.5% | 12 of 12 |
| 2018 | 111,468 | 74.0% | 12 of 12 |
| 2019 | 58,504 | 38.8% | 12 of 12 |
| 2020 | 104,278 | 69.0% | 12 of 12 |
| 2021 | 92,306 | 61.3% | 12 of 12 |
| 2022 | 85,141 | 56.5% | 12 of 12 |
| 2023 | 76,429 | 50.7% | 12 of 12 |
| 2024 | 80,392 | 53.2% | 12 of 12 |
| 2025 | 79,055 | 52.5% | 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 account · MISOEmissions
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 | 11.0 | December 1938 |
| 2 | Conventional Hydroelectric | 6.2 | December 1938 |
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 Wisconsin Public Service Corp 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 Grandfather Falls
More plants operated by Wisconsin Public Service Corp
Questions about Grandfather Falls
How much power does Grandfather Falls produce?
Grandfather Falls reported 79,055 MWh (79.1 GWh) of net generation in 2025, a 52.5% capacity factor on 17.2 MW of nameplate capacity.
Where is Grandfather Falls?
Grandfather Falls is in Lincoln County, Wisconsin, at 45.3019, −89.7917. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Grandfather Falls?
EIA-860M for August 2026 lists Wisconsin Public Service Corp as the operator (EIA operator ID 20860). The operator is not always the owner.
When did Grandfather Falls start operating?
Its first generator began operating in December 1938, according to EIA-860M.
Does InfraMap have power prices for Grandfather Falls?
Yes. InfraMap has MISO day-ahead and real-time prices at 1 price node linked to Grandfather Falls, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
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)
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page