PROJECT

Cranberry Point Energy Storage

We were the engineer-procure-construct (EPC) contractor for Plus Power’s 150-MW/300-MWh energy storage facility designed to support regional grid stability in New England and help the Commonwealth of Massachusetts clean its energy demand peaks.

In 2025, the Cranberry Point Energy Storage facility became the largest stand-alone battery system on New England’s grid, helping relieve pressure from the retirement of conventional plants and a surge in demand from economic growth and power-intensive sectors like artificial intelligence and data centers. 

Our team managed the turnkey project from detailed design and procurement through final construction and commissioning. The project included installation of 82 Tesla Megapack 2 XL battery enclosures and all associated balance-of-plant (BOP) equipment on a 6-acre site. A key element of our execution was managing interconnection of a 115-kV collector substation with a nearby switchyard, a critical node on a transmission line serving the Boston area. 

Photos courtesy Plus Power

Client

Plus Power

Location

Carver, Massachusetts

Region

Northeast

Service

Energy Storage

Industry

Power

Meeting Unique Project Needs

The completed facility includes thermal cameras and flame scanners for fire detection at the request of the authority having jurisdiction (AHJ), as well as standard security cameras, which presented an integration challenge. Other creative solutions applied included nonconductive fencing, lithium-ion-based backup power systems and an outdoor, non-walk-in substation control enclosure.

The site footprint was an unusual asymmetrical shape that required significant land allocation for stormwater management. The team initially proposed a modular substation for space savings, but schedule and cost concerns required pivoting to a more traditional open-air substation, which complicated space constraints.

Throughout the project, we leveraged a skilled workforce of 135 professionals from regional trade organizations to deliver the facility.

Successful Operation

The completed energy storage facility is boosting regional energy resilience. With a near-instantaneous response time, it can absorb excess energy and inject it back into the grid during periods of peak demand, helping stabilize energy costs and reduce reliance on fossil-fuel-fired peaker plants.  

During a June 2025 heat wave, the project responded with 100% availability during a scarcity event, helping maintain reliable power for the region while advancing Massachusetts nearly one-third of the way toward its 2025 energy storage goal.