Where is Mill Creek 3?

In San Bernardino 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 Mill Creek 3?

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

Who owns Mill Creek 3?

EIA-860M names Southern California Edison 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 Mill Creek 3 LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Southern California Edison 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 "Mill Creek 3 LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Mill Creek 3 still running?

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

Mill Creek 3

Mill Creek 3 is a 3 MW hydroelectric power plant in San Bernardino County, California, operated by Southern California Edison Co. EIA-860M lists 3 generating units here, inside CAISO. Its units entered service between 1903 and 1904.

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: 3 MW; 3 MW net summer
Generating units: 3
In service: 1903–1904
EIA plant ID: 7147

Where it is

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County: San Bernardino County, California
Coordinates: 34.088, -117.0395
Balancing authority: CISO
Sector: Electric Utility

Units, technology and status

Operator of record: Southern California Edison Co
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Standby/Backup

Every plant Southern California Edison Co reports to EIA →

Mill Creek 3: FAQ

Where is Mill Creek 3?: In San Bernardino 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 Mill Creek 3?: 3 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.
Who owns Mill Creek 3?: EIA-860M names Southern California Edison 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 Mill Creek 3 LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Southern California Edison 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 "Mill Creek 3 LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Mill Creek 3 still running?: EIA-860M files it as "Standby/Backup" for 2026-07. Statuses change monthly, and this page follows the monthly release.