Station 9 Energy Storage System — United States of America

Station 9 Energy Storage System is a 2 MW storage power plant in Massachusetts, United States of America. It is operated by Town of Braintree - (MA). Based on its capacity (estimated), it can supply roughly 500 homes (estimated). It ranks #9142 of 10,884 United States of America power plants by installed capacity. Commissioned in 2018, it is around 8 years old — recently built. 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 USA0062257.

Data provenance

Source of the capacity and fuel values:

capacity: Wikidata P2109; fuel: WRI GPPD

In context: how this plant compares

At 2 MW, Station 9 Energy Storage System is below 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

Share of United States of America storage capacity

0.2% of 815 MW across 104 plants in this dataset

Age among peers

60 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 Town of Braintree - (MA).

Local climate & thermal context

This storage plant stores and releases electricity (pumped-hydro or batteries) to balance the grid. It sits in a humid subtropical climate (Köppen Cfa) — Northern Hemisphere, latitude 42.2°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 30% 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: 68/100 — this site sits in the top 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 moderately corrosive environment (estimated ISO 9223 class C3 — Medium), 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 #75 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

• Braintree Landfill Solar · Solar · 1 MW · Massachusetts
• Potter Station 2 · Gas · 217 MW · Massachusetts
• Fore River Generating Station · Gas · 872.2 MW · Massachusetts
• Randolph · Solar · 3.8 MW · Massachusetts
• Shuman Solar · Solar · 2.2 MW · Massachusetts
• Boston Scientific Solar · Solar · 1.1 MW · Massachusetts

Location

Coordinates 42.1877, -70.9764 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions