Where is Watson Cogeneration?

In Los Angeles 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 Watson Cogeneration?

405 MW of nameplate capacity across 6 units, as of the EIA-860M release for 2026-07.

Who owns Watson Cogeneration?

EIA-860M names ARCO Products Co-Watson 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 Watson Cogeneration LLC?

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

Is Watson Cogeneration still running?

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

Watson Cogeneration

Watson Cogeneration is a 405 MW natural gas power plant in Los Angeles County, California, operated by ARCO Products Co-Watson. EIA-860M lists 6 generating units here, inside CAISO. Its units entered service between 1987 and 1988.

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: 405 MW; 398 MW net summer
Generating units: 6
In service: 1987–1988
EIA plant ID: 50216

Where it is

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County: Los Angeles County, California
Coordinates: 33.8166, -118.2448
Balancing authority: CISO
Sector: Industrial CHP

Units, technology and status

Operator of record: ARCO Products Co-Watson
Primary energy source: Natural gas
Technologies: Natural Gas Fired Combined Cycle
Status: Operating

Every plant ARCO Products Co-Watson reports to EIA →

Watson Cogeneration: FAQ

Where is Watson Cogeneration?: In Los Angeles 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 Watson Cogeneration?: 405 MW of nameplate capacity across 6 units, as of the EIA-860M release for 2026-07.
Who owns Watson Cogeneration?: EIA-860M names ARCO Products Co-Watson 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 Watson Cogeneration LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — ARCO Products Co-Watson 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 "Watson Cogeneration LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Watson Cogeneration still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.