Nameplate capacity
30 MW
Rank in California
#570
of 1,897 plants
In service since
1958
June 1958
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Oakdale&South San Joaquin Irrigation D.
- County
- Tuolumne County
- Generating units
- 3
- Share of state capacity
- 0.03%
- Rank among hydro plants in California
- #80 of 244
- EIA plant code
- 416
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 12 MW | 9.0 MW | 1958 | Operating |
| 2 | Conventional Hydroelectric | 12 MW | 10 MW | 1958 | Operating |
| 3 | Conventional Hydroelectric | 6.5 MW | 6.5 MW | 2012 | 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 California
| Vernon | Other | 30 MW |
| Muck Valley Hydroelectric | Hydro | 30 MW |
| Diamond Valley Lake | Hydro | 30 MW |
| CP Kelco San Diego Plant | Natural gas | 29 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 30 MW solar plant and a 30 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 California power plants · What California actually generates