Mammoth Plains
Mammoth Plains is a 226 MW wind farm in Dewey County, Oklahoma, operated by Mammoth Plains Wind Project. EIA-860M lists 1 generating unit here, inside SPP. Its unit entered service in 2014.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 226.1 MW
- 226.1 MW net summer
- Generating units
- 1
- In service
- 2014
- EIA plant ID
- 59284
Where it is
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- County
- Dewey County, Oklahoma
- Coordinates
- 35.9789, -98.7103
- Balancing authority
- SWPP
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Mammoth Plains Wind Project
- Primary energy source
- Wind
- Technologies
- Onshore Wind Turbine
- Status
- Operating
Mammoth Plains: FAQ
- Where is Mammoth Plains?
- In Dewey County, Oklahoma (OK). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Mammoth Plains?
- 226 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Mammoth Plains?
- EIA-860M names Mammoth Plains Wind Project as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Mammoth Plains LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Mammoth Plains Wind Project here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Mammoth Plains LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Mammoth Plains still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.