Day County Wind LLC
Wind power plant in Day County, South Dakota. 99 MW of nameplate capacity across 1 generator, operated by Day County Wind LLC.
Also known as Day County Wind · Day County Wind Project · EIA plant 57194
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Key facts
- Capacity
- 99 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- April 2010First generator online
- Operator
- Day County Wind LLCEIA operator ID 56561
- Grid
- SPPBalancing authority SWPP
- Price nodes
- 1 SPP nodeResource nodes with prices
- Location
- Day County, SD45.2150, −97.9056
- EIA plant ID
- 57194EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Day County Wind produces
Free · EIA-923Net generation, 2025
439 GWh
439,195 MWh, final
Capacity factor, 2025
50.6%
2024: 49.3%
January to July 2026
255 GWh
Provisional
Range, 2015 to 2025
349.5–446.9
GWh a year. Low 2020, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | 297,453 | Not reported | 9 of 12 |
| 2011 | 440,098 | 50.7% | 12 of 12 |
| 2012 | 438,842 | 50.5% | 12 of 12 |
| 2013 | 411,346 | 47.4% | 12 of 12 |
| 2014 | 439,495 | 50.7% | 12 of 12 |
| 2015 | 424,041 | 48.9% | 12 of 12 |
| 2016 | 446,937 | 51.4% | 12 of 12 |
| 2017 | 396,969 | 45.8% | 12 of 12 |
| 2018 | 396,589 | 45.7% | 12 of 12 |
| 2019 | 383,217 | 44.2% | 12 of 12 |
| 2020 | 349,522 | 40.2% | 12 of 12 |
| 2021 | 419,808 | 48.4% | 12 of 12 |
| 2022 | 444,179 | 51.2% | 12 of 12 |
| 2023 | 408,511 | 47.1% | 12 of 12 |
| 2024 | 429,118 | 49.3% | 12 of 12 |
| 2025 | 439,195 | 50.6% | 12 of 12 |
| 2026 (provisional, partial year) | 254,799 | 50.6% | 7 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 · SPPEmissions
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 |
|---|---|---|---|
| GE15 | Onshore Wind Turbine | 99.0 | April 2010 |
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 Day County Wind LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Questions about Day County Wind
How much power does Day County Wind LLC produce?
Day County Wind LLC reported 439,195 MWh (439 GWh) of net generation in 2025, a 50.6% capacity factor on 99 MW of nameplate capacity. From January to July 2026 it reported 255 GWh, which is provisional.
Where is Day County Wind LLC?
Day County Wind LLC is in Day County, South Dakota, at 45.2150, −97.9056. It is in the Southwest Power Pool balancing area (SWPP).
Who operates Day County Wind LLC?
EIA-860M for August 2026 lists Day County Wind LLC as the operator (EIA operator ID 56561). The operator is not always the owner.
When did Day County Wind LLC start operating?
Its first generator began operating in April 2010, according to EIA-860M.
Does InfraMap have power prices for Day County Wind LLC?
Yes. InfraMap has SPP day-ahead and real-time prices at 1 price node linked to Day County Wind LLC, 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)
- SPP day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
- Project names from the USGS U.S. Wind Turbine Database
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page