Prairie Du Sac
Hydro power plant in Sauk County, Wisconsin. 33.4 MW of nameplate capacity across 8 generators, operated by Wisconsin Power & Light Co.
Also known as Prairie du Sac Hydroelectric Dam · EIA plant 4056
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 33.4 MWNameplate
- Generators
- 8 operatingEIA-860M, August 2026
- Operating since
- October 1915First generator online
- Operator
- Wisconsin Power & Light CoEIA operator ID 20856
- Grid
- MISOBalancing authority MISO
- Price nodes
- 1 MISO nodeResource nodes with prices
- Location
- Sauk County, WI43.3099, −89.7278
- EIA plant ID
- 4056EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Prairie Du Sac produces
Free · EIA-923Net generation, 2025
153 GWh
152,864 MWh, final
Capacity factor, 2025
52.2%
2024: 49.0%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
131.0–184.9
GWh a year. Low 2023, high 2019
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 130,932 | Not reported | 12 of 12 |
| 2001 | 143,247 | Not reported | 12 of 12 |
| 2002 | 170,982 | Not reported | 12 of 12 |
| 2003 | 109,555 | Not reported | 12 of 12 |
| 2004 | 139,477 | Not reported | 12 of 12 |
| 2005 | 110,271 | Not reported | 12 of 12 |
| 2006 | 111,067 | Not reported | 12 of 12 |
| 2007 | 112,388 | Not reported | 12 of 12 |
| 2008 | 127,462 | Not reported | 12 of 12 |
| 2009 | 110,722 | Not reported | 12 of 12 |
| 2010 | 145,813 | 58.6% | 12 of 12 |
| 2011 | 146,283 | 58.8% | 12 of 12 |
| 2012 | 99,856 | Not reported | 12 of 12 |
| 2013 | 123,046 | 44.7% | 12 of 12 |
| 2014 | 147,255 | 53.5% | 12 of 12 |
| 2015 | 133,404 | 48.5% | 12 of 12 |
| 2016 | 158,910 | Not reported | 12 of 12 |
| 2017 | 156,271 | Not reported | 12 of 12 |
| 2018 | 149,689 | Not reported | 12 of 12 |
| 2019 | 184,907 | 63.2% | 12 of 12 |
| 2020 | 178,749 | 60.9% | 12 of 12 |
| 2021 | 145,118 | 49.6% | 12 of 12 |
| 2022 | 137,129 | 46.9% | 12 of 12 |
| 2023 | 131,025 | 44.8% | 12 of 12 |
| 2024 | 143,782 | 49.0% | 12 of 12 |
| 2025 | 152,864 | 52.2% | 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 | 3.5 | October 1915 |
| 2 | Conventional Hydroelectric | 4.3 | December 1915 |
| 3 | Conventional Hydroelectric | 4.8 | March 1920 |
| 4 | Conventional Hydroelectric | 4.8 | February 1922 |
| 5 | Conventional Hydroelectric | 4.0 | March 1938 |
| 6 | Conventional Hydroelectric | 4.0 | March 1938 |
| 7 | Conventional Hydroelectric | 4.0 | November 1940 |
| 8 | Conventional Hydroelectric | 4.0 | October 1940 |
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 Power & Light Co 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 Prairie Du Sac
More plants operated by Wisconsin Power & Light Co
Questions about Prairie Du Sac
How much power does Prairie Du Sac produce?
Prairie Du Sac reported 152,864 MWh (153 GWh) of net generation in 2025, a 52.2% capacity factor on 33.4 MW of nameplate capacity.
Where is Prairie Du Sac?
Prairie Du Sac is in Sauk County, Wisconsin, at 43.3099, −89.7278. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Prairie Du Sac?
EIA-860M for August 2026 lists Wisconsin Power & Light Co as the operator (EIA operator ID 20856). The operator is not always the owner.
When did Prairie Du Sac start operating?
Its first generator began operating in October 1915, according to EIA-860M.
Does InfraMap have power prices for Prairie Du Sac?
Yes. InfraMap has MISO day-ahead and real-time prices at 1 price node linked to Prairie Du Sac, 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