Mariposa Energy Project
Natural gas power plant · Alameda County, California
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- Diamond Generating Corporation
- County
- Alameda County
- Generating units
- 4
- Share of state capacity
- 0.19%
- Rank among natural gas plants in California
- #50 of 309
- EIA plant code
- 57483
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combustion Turbine | 50 MW | 50 MW | 2012 | Operating |
| CTG2 | Natural Gas Fired Combustion Turbine | 50 MW | 50 MW | 2012 | Operating |
| CTG3 | Natural Gas Fired Combustion Turbine | 50 MW | 50 MW | 2012 | Operating |
| CTG4 | Natural Gas Fired Combustion Turbine | 50 MW | 50 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
| Imperial Valley Solar, LLC | Solar | 200 MW |
| J S Eastwood | Hydro | 200 MW |
| Woodland | Natural gas | 199 MW |
| Folsom | Hydro | 199 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 200 MW solar plant and a 200 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