West Point Treatment Plant — United States of America

West Point Treatment Plant is a 4.6 MW biomass power plant in Washington, United States of America. It is operated by King County Dept-Natural Res. Based on reported annual generation of 15 GWh, it can supply roughly 4.3k homes. It ranks #7304 of 10,884 United States of America power plants by installed capacity. Commissioned in 2012, it is around 14 years old — relatively modern. In context, biomass supplies about 1.0% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0050329.

Data provenance

Source of the capacity and fuel values:

capacity: Wikidata P2109; fuel: WRI GPPD

In context: how this plant compares

At 4.6 MW, West Point Treatment Plant is below the median biomass plant in United States of America (17.9 MW). Biomass plants burn organic material such as wood, residues or waste-derived fuel to raise steam; they are dispatchable and counted as low-carbon where the feedstock is sustainably sourced.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

Key facts

Load factor

37%, from 15 GWh of reported generation; the median for 144 biomass plants in United States of America that report generation is 53%

Share of United States of America biomass capacity

less than 0.1% of 6,324 MW across 184 plants in this dataset

Age among peers

102 of 153 dated biomass plants in United States of America are older

Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).

Reported generation trend

Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by King County Dept-Natural Res.

Local climate & thermal context

This biomass plant burns organic material (wood, residues) to raise steam for a turbine. It sits in a warm-summer Mediterranean climate (Köppen Csb) — Northern Hemisphere, latitude 47.7°N — which shapes how much energy it can produce and how its output varies through the year.

Monthly mean temperature

Heating degree-days here run 5% above the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.

Climate heat-demand index: 52/100 — this site sits in the mid third of the power plants we cover by heating degree-days.

Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.

Site climate & environmental severity

This site sits in a mild atmospheric environment (estimated ISO 9223 class C2 — Low), with humidity / wetness the leading environmental stress.

Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.

How it compares & nearby plants

The #120 largest biomass power plant of 184 in United States of America by capacity.

United States of America has 184 biomass power plants in this dataset, together about 6,324 MW of capacity.

Nearby power plants

• University of Washington Power Plant · Oil · 15 MW · Washington
• MESA 1 · Storage · 2 MW · Washington
• Rocky Brook Hydroelectric · Hydro · 1.6 MW · Washington
• Cedar Hills · Waste · 5.4 MW · Washington
• MESA 2 · Storage · 2.4 MW · Washington
• WestRock (WA) · Biomass · 64 MW · Washington

Location

Coordinates 47.6611, -122.4464 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions