United States › Power plants › Battery storage › Oklahoma
BATTERY STORAGEMammoth Plains Energy Storage II
Mammoth Plains Energy Storage II is a 101 MW planned battery storage site in Dewey County, Oklahoma, operated by Mammoth Plains Energy Center, LLC.
Plant statusIn planning
- Planning (current stage)
- Consented (not yet reached)
- Construction (not yet reached)
- OperatingTarget May 2029 (not yet reached)
- Closed (not yet reached)
Planned start of operation reported to EIA: May 2029.
Generators
Each generating unit EIA lists at this plant.
| Unit | Technology | Capacity | Status |
|---|---|---|---|
| MAMM2 | Batteries | 101 MW | Planned, approvals not yet sought |
Plant details
- Operator
- Mammoth Plains Energy Center, LLC
- Location
- Dewey County, Oklahoma
- Balancing authority
- SWPP
- Sector
- IPP Non-CHP
- Capacity
- Planned: 101 MW
- EIA plant ID
- 70443
Location
35.9797, -98.7061
Nearby power plants
- Mammoth Plains Energy StorageBattery storage · 150 MW · 0.2 mi
- Mammoth PlainsWind farms · 226 MW · 0.2 mi
- Crossroads Wind FarmWind farms · 228 MW · 3.9 mi
- Taloga Wind LLCWind farms · 130 MW · 17.0 mi
- Seiling Wind IWind farms · 199 MW · 18.8 mi
- Seiling Wind IIWind farms · 98.6 MW · 18.8 mi
- Traverse Wind Project, LLCWind farms · 999 MW · 19.9 mi
- Weatherford Wind Energy CenterWind farms · 147 MW · 32.5 mi
- Maverick Wind Project, LLCWind farms · 288 MW · 37.2 mi
- HintonSolar farms · 3.0 MW · 38.0 mi
Source: U.S. Energy Information Administration, Form EIA-860M, September 2026. Planned dates are targets reported by the developer and often change. Report a problem