Mammoth Plains
Wind power plant in Dewey County, Oklahoma. 226.1 MW of nameplate capacity across 1 generator, operated by Mammoth Plains Wind Project.
Also known as EIA plant 59284
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 226.1 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- December 2014First generator online
- Operator
- Mammoth Plains Wind ProjectEIA operator ID 60768
- Grid
- SPPBalancing authority SWPP
- Price nodes
- 1 SPP nodeResource nodes with prices
- Location
- Dewey County, OK35.9789, −98.7103
- EIA plant ID
- 59284EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Mammoth Plains produces
Free · EIA-923Net generation, 2025
623 GWh
622,982 MWh, final
Capacity factor, 2025
Not reported
2024: 41.2%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
623.0–834.7
GWh a year. Low 2025, 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 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | 49,437 | Not reported | 1 of 12 |
| 2015 | 797,659 | 45.8% | 12 of 12 |
| 2016 | 834,668 | 47.7% | 12 of 12 |
| 2017 | 788,789 | 45.2% | 12 of 12 |
| 2018 | 826,771 | 47.4% | 12 of 12 |
| 2019 | 816,919 | 46.9% | 12 of 12 |
| 2020 | 808,315 | 46.2% | 12 of 12 |
| 2021 | 800,974 | 45.9% | 12 of 12 |
| 2022 | 802,607 | 46.0% | 12 of 12 |
| 2023 | 739,758 | 42.4% | 12 of 12 |
| 2024 | 719,868 | 41.2% | 12 of 12 |
| 2025 | 622,982 | Not reported | 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 · 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 |
|---|---|---|---|
| GE1.7 | Onshore Wind Turbine | 226.1 | December 2014 |
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 Mammoth Plains Wind Project 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 Mammoth Plains
How much power does Mammoth Plains produce?
Mammoth Plains reported 622,982 MWh (623 GWh) of net generation in 2025.
Where is Mammoth Plains?
Mammoth Plains is in Dewey County, Oklahoma, at 35.9789, −98.7103. It is in the Southwest Power Pool balancing area (SWPP).
Who operates Mammoth Plains?
EIA-860M for August 2026 lists Mammoth Plains Wind Project as the operator (EIA operator ID 60768). The operator is not always the owner.
When did Mammoth Plains start operating?
Its first generator began operating in December 2014, according to EIA-860M.
Does InfraMap have power prices for Mammoth Plains?
Yes. InfraMap has SPP day-ahead and real-time prices at 1 price node linked to Mammoth Plains, 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page