806th largest plant in California · 5651st nationally
Mammoth G1 is a geothermal power plant in California with a nameplate capacity of 10.0 MW. It generates roughly 57.7k MWh per year — enough to power about 5,493 average U.S. homes.
Its capacity factor of 66% puts it in the middle range — running steadily but not full-time.
| Plant Name | Mammoth G1 |
|---|---|
| Operator | Ormat Nevada Inc |
| City | Mammoth Lakes |
| County | Mono County |
| State | California |
| ZIP | 93546 |
| Coordinates | 37.64510, -118.91430 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| GEN1 | Geothermal | Geothermal | 5.0 MW | Operating | 1984 |
| GEN2 | Geothermal | Geothermal | 5.0 MW | Operating | 1984 |
| Owner | Location | Share |
|---|---|---|
| Mammoth Pacific Lp | Mammoth Lakes, CA | 10000.0% |
Ownership reported to EIA Form 860. Percentages reflect reported generator-level ownership share, averaged when a plant has multiple generators.
| NERC Region | WECC |
|---|---|
| Balancing Authority | California Independent System Operator |
Geothermal plants tap heat from underground reservoirs to spin steam turbines. They provide carbon-free baseload power with very high capacity factors, but they only work where hot rock is accessible — primarily in the western U.S.