Where is Graniterock Quarry?

In San Benito County, California (CA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

How big is Graniterock Quarry?

4 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.

Who owns Graniterock Quarry?

EIA-860M names CalCom Energy as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as Graniterock Quarry LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — CalCom Energy here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Graniterock Quarry LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Graniterock Quarry still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Graniterock Quarry

Graniterock Quarry is a 4 MW solar farm in San Benito County, California, operated by CalCom Energy. EIA-860M lists 1 generating unit here, inside CAISO. Its unit entered service in 2022.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 4.4 MW; 4.4 MW net summer
Generating units: 1
In service: 2022
EIA plant ID: 65485

Where it is

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County: San Benito County, California
Coordinates: 36.8782, -121.6028
Balancing authority: CISO
Sector: IPP Non-CHP

Units, technology and status

Operator of record: CalCom Energy
Primary energy source: Solar
Technologies: Solar Photovoltaic
Status: Operating

Every plant CalCom Energy reports to EIA →

Graniterock Quarry: FAQ

Where is Graniterock Quarry?: In San Benito County, California (CA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is Graniterock Quarry?: 4 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
Who owns Graniterock Quarry?: EIA-860M names CalCom Energy as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as Graniterock Quarry LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — CalCom Energy here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Graniterock Quarry LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Graniterock Quarry still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.