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The proposed facility’s construction is the first part of a wider development project at the former ExxonMobil tank farm site.
The storage system will be built at the site of the former ExxonMobil tank farm. Craig F. Walker/The Boston Globe
March 1, 2026 | 10:54 AM
2 minutes to read
Energy company Jupiter Power has secured state approval to build the largest battery energy storage system in Massachusetts, marking another step forward for Everett’s multi-stage development project.
The proposed facility will be built on the site of the former ExxonMobil tank farm and span approximately 16.5 of the available 20.75 acres of land, according to its Energy Facilities Siting Board information page. The project will include two substations and two underground transmission lines.
The City of Everett Zoning Ordinance granted the Texas-based energy company zoning exemptions at a board meeting Thursday, according to the info page. With the city and state’s permission, Jupiter Power will develop facilities on both sections of the site, which are divided by Beacham Street.
Using lithium-ion batteries, the project will house approximately 816 above-ground enclosures each measuring about 19.7 feet long, 7.9 feet wide, and 9.5 feet tall, the info page states. These enclosures will include integrated cooling and heating systems along with power-conversion infrastructure.
The two electric substations will take the generated power and increase its voltage to interconnect with the existing Eversource Mystic Substation, according to the info page. In turn, they will also take power from the Eversource substation and decrease it for storage in the battery energy storage system.
One transmission line will run under Beacham Street to connect the two substations, and the other will run from the Southern Substation to the Mystic Substation, the info page states. With the three substations connected, the Everett project will ensure that excess energy from the electric grid is available for later use when needed.
In addition, developers have said that the system will assist in the state’s clean energy transition. Beyond battery power, the facility will be a key connector for wind-generated power and other sources of renewable energy.
The construction of this storage system is part of a larger mixed-use development project dubbed the “Docklands.” The project is a joint venture developed by Everett Landco and led by The Davis Companies.
Jupiter Power’s facility marks the first phase of the wider remediation efforts. The second phase will include the construction of manufacturing, lab, office, retail, maker, and residential space.
This second phase will utilize about 3.3 million square feet of lab and office space and 2.8 million square feet of residential space, which is about 3,200 residential units. The project will also encompass about 400,000 square feet of industrial and manufacturing space, 240,000 square feet of retail space, and 36,000 square feet of maker space.
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