Nameplate capacity
130 MW
Rank in Oklahoma
#74
of 147 plants
In service since
1940
August 1940
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Grand River Dam Authority
- County
- Mayes County
- Generating units
- 7
- Share of state capacity
- 0.36%
- Rank among hydro plants in Oklahoma
- #2 of 11
- EIA plant code
- 2981
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 22 MW | 20 MW | 1940 | Operating |
| 2 | Conventional Hydroelectric | 22 MW | 20 MW | 1940 | Operating |
| 3 | Conventional Hydroelectric | 22 MW | 20 MW | 1940 | Operating |
| 4 | Conventional Hydroelectric | 22 MW | 20 MW | 1940 | Operating |
| 5 | Conventional Hydroelectric | 22 MW | 20 MW | 1946 | Operating |
| 6 | Conventional Hydroelectric | 22 MW | 20 MW | 1946 | Operating |
| A | Conventional Hydroelectric | 0.5 MW | 0.5 MW | 1940 | Out of service and NOT expected to return to service in next calendar year |
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
| Dempsey Ridge Wind Farm | Wind | 132 MW |
| Frontier | Natural gas | 131 MW |
| Minco Wind IV, LLC | Wind | 130 MW |
| Taloga Wind LLC | Wind | 130 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 130 MW solar plant and a 130 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