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

1 GW of nameplate capacity across 10 units, as of the EIA-860M release for 2026-07.

EIA-860M names PUD No 2 of Grant County - (WA) 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 Wanapum LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — PUD No 2 of Grant County - (WA) 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 "Wanapum LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Wanapum still running?

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

Wanapum

Wanapum is a 1 GW hydroelectric power plant in Grant County, Washington, operated by PUD No 2 of Grant County - (WA). EIA-860M lists 10 generating units here. Its units entered service between 2011 and 2020.

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: 1,220 MW; 1,220 MW net summer
Generating units: 10
In service: 2011–2020
EIA plant ID: 3888

Where it is

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County: Grant County, Washington
Coordinates: 46.8731, -119.9703
Balancing authority: GCPD
Sector: Electric Utility

Units, technology and status

Operator of record: PUD No 2 of Grant County - (WA)
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating

Every plant PUD No 2 of Grant County - (WA) reports to EIA →

Wanapum: FAQ

Where is Wanapum?: In Grant County, Washington (WA). 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 Wanapum?: 1 GW of nameplate capacity across 10 units, as of the EIA-860M release for 2026-07.
Who owns Wanapum?: EIA-860M names PUD No 2 of Grant County - (WA) 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 Wanapum LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — PUD No 2 of Grant County - (WA) 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 "Wanapum LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Wanapum still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.