470th largest plant in California · 3806th nationally
Cd4 is a geothermal power plant in California with a nameplate capacity of 44.4 MW. It generates roughly 272.3k MWh per year — enough to power about 25,934 average U.S. homes.
Its capacity factor of 70% puts it in the middle range — running steadily but not full-time.
| Plant Name | Cd4 |
|---|---|
| Operator | Cd4 |
| City | Mammoth Lakes |
| County | Mono County |
| State | California |
| ZIP | 93546 |
| Coordinates | 37.64605, -118.91579 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| OEC1 | Geothermal | Geothermal | 44.4 MW | Operating | 2022 |
| 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.