In Pierce 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.

51 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.

EIA-860M names City of Tacoma - (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 Alder LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of Tacoma - (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 "Alder LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Alder still running?

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

Alder

Alder is a 51 MW hydroelectric power plant in Pierce County, Washington, operated by City of Tacoma - (WA). EIA-860M lists 2 generating units here. Its units entered service between 1945 and 1947.

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: 51 MW; 51 MW net summer
Generating units: 2
In service: 1945–1947
EIA plant ID: 3913

Where it is

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County: Pierce County, Washington
Coordinates: 46.8016, -122.3102
Balancing authority: TPWR
Sector: Electric Utility

Units, technology and status

Operator of record: City of Tacoma - (WA)
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating

Every plant City of Tacoma - (WA) reports to EIA →

Alder: FAQ

Where is Alder?: In Pierce 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 Alder?: 51 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
Who owns Alder?: EIA-860M names City of Tacoma - (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 Alder LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of Tacoma - (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 "Alder LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Alder still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.