Mammoth Plains
Wind power plant · Dewey County, Oklahoma
Nameplate capacity
226 MW
Rank in Oklahoma
#44
of 147 plants
In service since
2014
December 2014
Details
- Primary fuel
- Wind
- Technology
- Onshore Wind Turbine
- Operator
- Mammoth Plains Wind Project
- County
- Dewey County
- Generating units
- 1
- Share of state capacity
- 0.62%
- Rank among wind plants in Oklahoma
- #20 of 70
- EIA plant code
- 59284
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GE1.7 | Onshore Wind Turbine | 226 MW | 226 MW | 2014 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Oklahoma
| Armadillo Flats Wind Project, LLC | Wind | 247 MW |
| Crossroads Wind Farm | Wind | 228 MW |
| Great Western Wind Energy, LLC | Wind | 225 MW |
| Willow Creek Wind (OK) | Wind | 220 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 226 MW solar plant and a 226 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Oklahoma power plants · What Oklahoma actually generates