731st largest plant in California · 5128th nationally
Mammoth G3 is a geothermal power plant in California with a nameplate capacity of 15.0 MW. It generates roughly 104.0k MWh per year — enough to power about 9,909 average U.S. homes.
Its capacity factor of 79% puts it in the middle range — running steadily but not full-time.
| Plant Name | Mammoth G3 |
|---|---|
| Operator | Ormat Nevada Inc |
| City | Mammoth Lakes |
| County | Mono County |
| State | California |
| ZIP | 93546 |
| Coordinates | 37.64550, -118.90960 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| T101 | Geothermal | Geothermal | 5.0 MW | Operating | 1990 |
| T102 | Geothermal | Geothermal | 5.0 MW | Operating | 1990 |
| T103 | Geothermal | Geothermal | 5.0 MW | Operating | 1990 |
| 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.