Twelvemile Solar 1
Solar power plant · Mayes County, Oklahoma
Nameplate capacity
152 MW
Rank in Oklahoma
#59
of 147 plants
In service since
2026
March 2026
Details
- Primary fuel
- Solar
- Technology
- Solar Photovoltaic
- Operator
- Leeward Asset Management, LLC
- County
- Mayes County
- Generating units
- 1
- Share of state capacity
- 0.42%
- Rank among solar plants in Oklahoma
- #1 of 17
- EIA plant code
- 68088
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| TS1 | Solar Photovoltaic | 152 MW | 152 MW | 2026 | 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
| Tinker | Natural gas | 178 MW |
| Rock Falls Wind Farm LLC | Wind | 155 MW |
| Grant Wind, LLC | Wind | 152 MW |
| Keenan II Renewable Energy Co LLC | Wind | 152 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 152 MW solar plant and a 152 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