Where is Diamond Valley Lake?

In Riverside 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 Diamond Valley Lake?

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

Who owns Diamond Valley Lake?

EIA-860M names Metropolitan Water District of S CA 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 Diamond Valley Lake LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Metropolitan Water District of S CA 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 "Diamond Valley Lake LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Diamond Valley Lake still running?

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

Diamond Valley Lake

Diamond Valley Lake is a 30 MW hydroelectric power plant in Riverside County, California, operated by Metropolitan Water District of S CA. EIA-860M lists 9 generating units here, inside CAISO. Its units entered service in 2001.

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: 29.7 MW; 29.7 MW net summer
Generating units: 9
In service: 2001
EIA plant ID: 7942

Where it is

Loading map…

County: Riverside County, California
Coordinates: 33.6808, -117.0698
Balancing authority: CISO
Sector: Electric Utility

Units, technology and status

Operator of record: Metropolitan Water District of S CA
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating

Every plant Metropolitan Water District of S CA reports to EIA →

Diamond Valley Lake: FAQ

Where is Diamond Valley Lake?: In Riverside 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 Diamond Valley Lake?: 30 MW of nameplate capacity across 9 units, as of the EIA-860M release for 2026-07.
Who owns Diamond Valley Lake?: EIA-860M names Metropolitan Water District of S CA 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 Diamond Valley Lake LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Metropolitan Water District of S CA 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 "Diamond Valley Lake LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Diamond Valley Lake still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.