Nameplate capacity
128 MW
Rank in Oklahoma
#77
of 147 plants
In service since
1964
May 1964
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Grand River Dam Authority
- County
- Mayes County
- Generating units
- 4
- Share of state capacity
- 0.35%
- Rank among hydro plants in Oklahoma
- #3 of 11
- EIA plant code
- 2980
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 32 MW | 32 MW | 1964 | Operating |
| 2 | Conventional Hydroelectric | 32 MW | 32 MW | 1964 | Operating |
| 3 | Conventional Hydroelectric | 32 MW | 32 MW | 1964 | Operating |
| 4 | Conventional Hydroelectric | 32 MW | 32 MW | 1964 | 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
| Minco Wind IV, LLC | Wind | 130 MW |
| Taloga Wind LLC | Wind | 130 MW |
| Huckleberry Solar | Solar | 125 MW |
| Red Hills Wind Project LLC | Wind | 123 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 128 MW solar plant and a 128 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