Plus Power has officially begun operating its new Cross Town Energy Storage facility in Gorham, marking the start of commercial operations for the largest battery system on the ISO New England grid.
The 175 MW / 350 MWh installation captures excess electricity when demand is low and releases it during peak periods, helping to stabilise the grid, temper price spikes, and improve efficiency across the region.
At the ribbon-cutting ceremony, Maine’s Governor Janet Mills praised the milestone, calling the project “a significant achievement that delivers lasting savings and reliability for Maine people.” She said the facility will reduce reliance on fossil fuel generation during high-demand events such as winter cold snaps and summer heat waves.
Developed by Plus Power, the project spans approximately five acres near Central Maine Power’s Moshers substation – a known congestion point on the regional grid. Its location allows stored energy to flow freely from northern wind projects to southern Maine and the Boston area.
Built with engineering and construction support from Maine-based Cianbro Corporation, the system uses 156 Sungrow PowerTitan battery units designed for high performance in harsh climates. Cross Town is expected to help offset capacity shortfalls as older gas-fired plants in New England retire.
The facility contributes toward Maine’s target of 400 MW of battery energy storage by 2030 and supports the broader state goals of achieving 90% renewable electricity by 2030 and 100% by 2040.
Cross Town is Plus Power’s second major New England project following its Cranberry Point Energy Storage facility in Carver, Massachusetts, which came online in 2025. Both sites remained fully operational during recent extreme weather, helping ISO New England maintain grid reliability through Winter Storm Fern.
Headquartered near Houston, Plus Power operates more than 1.6 GW of battery storage capacity across nine US facilities and has an 11 GW project pipeline spanning 20 states.
