VESI Pomona — United States of America

VESI Pomona is a 20 MW storage power plant in California, United States of America. It is operated by VESI Pomona Energy Storage Inc.. Based on its capacity (estimated), it can supply roughly 5.0k homes (estimated). It ranks #4802 of 10,884 United States of America power plants by installed capacity. Commissioned in 2017, it is around 9 years old — relatively modern. As a non-combustion source, it has no direct CO₂ emissions from generation. 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 USA0050300.

Data provenance

Source of the capacity and fuel values:

capacity: Wikidata P2109; fuel: WRI GPPD

In context: how this plant compares

At 20 MW, VESI Pomona is well above the median storage plant in United States of America (4 MW). This facility converts its energy source into electricity for the grid; its capacity, fuel type and location determine its role in the national power mix.

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

Key facts

Generation trend

106 GWh in 2013 and 103 GWh in 2015 (−3%)

Highest and lowest year

2013: 106 GWh; 2014: 101 GWh

Share of United States of America storage capacity

2.5% of 815 MW across 104 plants in this dataset

Age among peers

41 of 104 dated storage 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 VESI Pomona Energy Storage Inc..

Local climate & thermal context

This storage plant stores and releases electricity (pumped-hydro or batteries) to balance the grid. It sits in a warm-summer Mediterranean climate (Köppen Csb) — Northern Hemisphere, latitude 34.1°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 67% 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: 24/100 — this site sits in the bottom 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 an aggressive, high-corrosion environment (estimated ISO 9223 class C5 — Very high), with marine salt 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 #14 largest storage power plant of 104 in United States of America by capacity.

United States of America has 104 storage power plants in this dataset, together about 815 MW of capacity.

Nearby power plants

• Spadra Landfill Gas to Energy · Gas · 10.6 MW · California
• Weymouth Solar Plant · Solar · 3 MW · California
• San Dimas Wash Generating Station · Hydro · 1 MW · California
• San Dimas · Hydro · 9.9 MW · California
• Industry MetroLink PV 1 · Solar · 1.5 MW · California
• Solar Photovoltaic Project #02 · Solar · 1 MW · California

Location

Coordinates 34.0594, -117.7742 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions