Coso Energy Developers
Other power plant · Inyo County, California
Nameplate capacity
90 MW
Rank in California
#306
of 1,897 plants
In service since
1988
December 1988
Details
- Primary fuel
- Other
- Technology
- Geothermal
- Operator
- Coso Operating Co LLC
- County
- Inyo County
- Generating units
- 3
- Share of state capacity
- 0.08%
- Rank among other plants in California
- #10 of 152
- EIA plant code
- 10875
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN7 | Geothermal | 30 MW | 22 MW | 1988 | Operating |
| GEN8 | Geothermal | 30 MW | 23 MW | 1988 | Operating |
| GEN9 | Geothermal | 30 MW | 24 MW | 1989 | 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
| Alta Wind XI | Wind | 90 MW |
| CES Placerita Power Plant | Natural gas | 90 MW |
| Coso Power Developers | Other | 90 MW |
| Mojave 16/17/18 | Wind | 89 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 90 MW solar plant and a 90 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