The Energy Storage Report 2024

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Jupiter Power unveils plan for 700MW BESS at former ExxonMobil oil depot in Massachusetts


Utility-scale battery storage developer Jupiter Power has unveiled plans to construct a 700MW standalone battery energy storage system (BESS) facility at the site of a former oil depot previously owned by ExxonMobil in Everett, Massachusetts.

Plans for the project, dubbed the Trimount Energy Storage Facility, were disclosed by Jupiter Power CEO Andrew Bowman in an interview with local news outlet Boston Globe. The BlackRock-owned developer plans to invest US$500 million in the project which it expects to see online in 2027.

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Jupiter Power has launched a website for the project that has yet to be pushed live. This is standard practice for Jupiter Power which creates individual websites for many of its developments including its proposed 85MW Prairie Flyer Energy Storage project in Montgomery County, Ohio.

Brownfield site development

Jupiter Power’s proposed Trimount project is part of a wider redevelopment programme at the former ExxonMobil site in Everett, Middlesex County, Massachusetts.

Real estate developer Davis Companies purchased the 100-acre site from ExxonMobil in January 2024 following a lawsuit and settlement agreement with non-profit organisation Conservation Law Foundation (CLF).

The oil major was forced to close the Everett oil depot after the agreement stipulated the site could no longer be used to store petroleum products.

Following Davis Companies’ acquisition, the Massachusetts Attorney General’s Office entered into an agreement with the real estate company for the environmental remediation and redevelopment of the former tank farm site.

The agreement, announced 30 May 2024, provides liability protection to Davis Companies in exchange for its commitment to redevelop the brownfield site. The formal agreement between the two parties describes the brownfield site as being “heavily contaminated with oil” and “industrial chemicals formerly used in the site operations.”

1.6GW of battery interconnection requests at Mystic Substation

The Trimount project will connect to the local electricity grid via Eversource Energy’s Mystic Substation, a highly sought-after point of interconnection according to ISO New England’s public interconnection queue. Six separate requests to interconnect battery storage projects to the Mystic Substation total over 1.6GW of capacity.

Only one of the six battery storage projects seeking permission to connect to Eversource’s Mystic Substation is identifiable at this stage: Norman Street Battery Storage. Unlike other interconnection queues throughout North America (such as CAISO and ERCOT), important details such as a project name are only attributed to queue requests in New England at a later stage of development, meaning it can often be challenging to identify owners of certain queue positions.

Documents filed with ISO New England in July 2022 reveal that Jupiter Power is the owner of the Norman Street Battery Storage queue position (no. 1110) after the New England system operator determined that the project would not have significant adverse effects on the local grid.

The naming convention and interconnection request timeline for the Norman Street queue position suggest that this project is separate from Jupiter Power’s proposed Trimount development, and will be located on Norman Street approximately 0.5 miles northwest of the former ExxonMobil site.

Austin, TX-headquartered Jupiter Power has one of the largest operational battery storage fleets in ERCOT and claims to have a development pipeline of over 11GW in battery storage capacity across the United States.

In related news, fellow developer Plus Power recently closed financing on a 150MW/300MWh BESS project in Massachusetts which the company claimed will be the first large-scale standalone battery storage system to connect to the ISO New England grid.

Plus Power is targeting the completion of its Cranberry Point BESS, which won a contract in an ISO New England Forward Capacity Auction (FCA), in Q2 2025.

Jupiter Power’s 275MW New York BESS development

Elsewhere in the US, Jupiter Power recently held an open house to provide information to concerned local residents regarding its proposed 275MW Oyster Shore Battery Storage project which is set to replace an oil terminal owned by Global Partners in Nassau County, New York.

Under its Juno Power Management, LLC subsidiary, Jupiter Power submitted an interconnection request (queue no. 1431) with NYISO back in September 2022 for the project which will connect to the grid via Long Island Power Authority’s (LIPA’s) Shore Road 138kV Substation.

Local petition

Residents have voiced their concerns surrounding the proposed battery development with one online petition asking Oyster Bay Supervisor Joseph Saladino to halt the project entirely. The petition, currently at 1700 signatures, focuses on the risk of battery fires and even cites details of a fire that occurred last year at one of Convergent Energy + Power’s battery storage facilities in Warwick, New York.

Although only small at this stage, online petitions speaking out against battery storage developments have gained momentum in the past, including one last year speaking out against a battery microgrid project proposed by Rev Renewables and National Grid in Raquette Lake, New York, which garnered the support of over 27,500 local residents.

National Grid issued a statement in February of this year saying that it, along with Rev Renewables, had made the decision to cease development of the Central Adirondack Microgrid Project after carrying out “extensive community engagement.”

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