Ameresco Ox Mountain — United States of America

Ameresco Ox Mountain is a 11.4 MW waste power plant in California, United States of America. It is operated by AMERESCO Ox Mountain Energy LLC. Based on reported annual generation of 87 GWh, it can supply roughly 25k homes. It ranks #5454 of 10,884 United States of America power plants by installed capacity. Commissioned in 2009, it is around 17 years old — relatively modern. Its modelled annual emissions are 16,565 t CO₂/yr (Climate TRACE), equivalent to about 3.9k cars driven for a year. In context, the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0056895.

Data provenance

Source of the capacity and fuel values:

capacity: Wikidata P2109; fuel: WRI GPPD

In context: how this plant compares

At 11.4 MW, Ameresco Ox Mountain is well above the median waste plant in United States of America (6.6 MW). Waste-to-energy plants burn municipal solid waste to generate electricity and heat, cutting landfill volume while recovering energy from residual waste.

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

~16,565 t CO₂/yr (modelled) — in everyday terms

This facility's annual emissions are roughly equivalent to:

Equivalencies via US EPA Greenhouse Gas Equivalencies; modelled emissions from Climate TRACE.

Key facts

Load factor

87%, from 87 GWh of reported generation; the median for 506 waste plants in United States of America that report generation is 62%

Generation trend

86 GWh in 2013 and 87 GWh in 2019 (+1%)

Highest and lowest year

2014: 89 GWh; 2015: 80 GWh

Share of United States of America waste capacity

0.1% of 10,154 MW across 551 plants in this dataset

Age among peers

338 of 541 dated waste 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 AMERESCO Ox Mountain Energy LLC.

Local climate & thermal context

This waste plant recovers energy by combusting municipal or industrial waste. It sits in a warm-summer Mediterranean climate (Köppen Csb) — Northern Hemisphere, latitude 37.5°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 39% below 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: 34/100 — 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 corrosive environment (estimated ISO 9223 class C4 — High), with marine corrosion 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 #211 largest waste power plant of 551 in United States of America by capacity.

United States of America has 551 waste power plants in this dataset, together about 10,154 MW of capacity.

Nearby power plants

• Franklin Templeton San Mateo · Gas · 1.1 MW · California
• Silicon Valley Clean Water · Biomass · 1.2 MW · California
• SRI International Cogen Project · Gas · 6 MW · California
• Cardinal Cogen · Gas · 52.8 MW · California
• Stanford Campus Solar · Solar · 3.4 MW · California
• Solar Star Palo Alto I LLC · Solar · 1.3 MW · California

Location

Coordinates 37.5, -122.4 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions