1048th largest plant in California · 8228th nationally
Graniterock Quarry is a solar power plant in California with a nameplate capacity of 4.4 MW. It generates roughly 9.1k MWh per year — enough to power about 864 average U.S. homes.
Its capacity factor of 24% reflects intermittent or peaking operation.
| Plant Name | Graniterock Quarry |
|---|---|
| Operator | Calcom Energy |
| City | Aromas |
| County | San Benito County |
| State | California |
| ZIP | 95004 |
| Coordinates | 36.87816, -121.60280 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| GRWQ | Solar Photovoltaic | Solar | 4.4 MW | Operating | 2022 |
| Owner | Location | Share |
|---|---|---|
| Granite Rock Company | Watsonville, 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 |
Utility-scale solar farms convert sunlight directly into electricity using photovoltaic panels. They produce zero direct emissions and have no fuel cost, but generation is variable — peaking at midday and falling to zero at night. Capacity factors typically run 18–28% in good locations.