Plus Power Launches 175 MW Battery Project In Maine, Largest On ISO New England Grid

Maine Governor Janet Mills said the project would help lower electricity costs by reducing reliance on fossil fuel generation during periods of grid stress, including extreme cold weather.

U.S. energy storage developer Plus Power said on Thursday it has begun operations at its Cross Town Energy Storage facility in Gorham, Maine, marking the largest battery project connected to the ISO New England grid.

The 175 megawatt/350 megawatt-hour utility-scale battery system stores surplus electricity during periods of low demand and dispatches it during peak periods, helping balance intermittent renewable generation, improve grid reliability and reduce price spikes.

Maine Governor Janet Mills said the project would help lower electricity costs by reducing reliance on fossil fuel generation during periods of grid stress, including extreme cold weather.

400 MW of BESS Target

The project supports Maine’s target of deploying 400 MW of battery storage by 2030 and broader goals to achieve 90% renewable electricity sales by 2030 and 100% by 2040.

Located on about five acres, the facility is connected near Central Maine Power’s 115-kV Moshers substation, a congested part of the transmission grid. Its location is expected to help move wind power from northern Maine to demand centres in southern Maine and Boston and offset capacity lost from retiring gas and other power plants.

Chief Executive Naveen Abraham said the facility strengthens regional grid reliability and expands the company’s partnership with ISO New England.

Sungrow’s BESS Installed

Cross Town uses 156 units of Sungrow’s PowerTitan battery energy storage systems and was built with Maine-based Cianbro Corporation, which handled engineering, procurement and construction.

The project is Plus Power’s second battery installation in the region after the 150 MW/300 MWh Cranberry Point Energy Storage facility in Massachusetts, which entered service in spring 2025. The company said Cranberry Point supported the grid during a June heat-driven scarcity event when power prices surged to $1,110 per megawatt-hour and was fully available during Winter Storm Fern.

Plus Power develops, owns and operates standalone battery storage projects across the United States and has a development portfolio of about 11 GW across more than 20 states.