Where is Potter Valley?

In Mendocino 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 Potter Valley?

9 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.

Who owns Potter Valley?

EIA-860M names Pacific Gas & Electric Co. 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 Potter Valley LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Pacific Gas & Electric Co. 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 "Potter Valley LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Potter Valley still running?

EIA-860M files it as "Out of service and NOT expected to return to service in next calendar year" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Potter Valley

Potter Valley is a 9 MW hydroelectric power plant in Mendocino County, California, operated by Pacific Gas & Electric Co.. EIA-860M lists 3 generating units here, inside CAISO. Its units entered service between 1910 and 1939.

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: 9.4 MW; 9.2 MW net summer
Generating units: 3
In service: 1910–1939
EIA plant ID: 274

Where it is

Loading map…

County: Mendocino County, California
Coordinates: 39.3618, -123.1279
Balancing authority: CISO
Sector: Electric Utility

Units, technology and status

Operator of record: Pacific Gas & Electric Co.
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Out of service and NOT expected to return to service in next calendar year

Every plant Pacific Gas & Electric Co. reports to EIA →

Potter Valley: FAQ

Where is Potter Valley?: In Mendocino 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 Potter Valley?: 9 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.
Who owns Potter Valley?: EIA-860M names Pacific Gas & Electric Co. 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 Potter Valley LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Pacific Gas & Electric Co. 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 "Potter Valley LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Potter Valley still running?: EIA-860M files it as "Out of service and NOT expected to return to service in next calendar year" for 2026-07. Statuses change monthly, and this page follows the monthly release.