Massachusetts Unveils 250‑MW Medway Battery, Surpassing New England’s Record Massachusetts has added a 250‑MW Medway battery to its grid, overtaking the 175‑MW Cross Town battery as the largest in New England. The new megabattery is part of a broader push to manage peak demand and integrate solar generation. VC Renewables , a subsidiary of Vitol, brought the 250‑MW Medway battery online on Feb. 25, backed by a $158 million tax‑equity deal from Advantage Capital . The project follows the 175‑MW Cross Town battery, the region’s previous record holder. Meanwhile, Jupiter Power is developing a 700‑MW/2.8‑GWh Trimount plant at a former oil‑storage site in Everett, Massachusetts, slated for completion in 2028 or 2029; the plant could power roughly 500,000 homes. Vistra ’s 750‑MW/3‑GWh battery in Moss Landing, California, once set a national record before a fire reduced its capacity. Small‑scale batteries in Massachusetts range from 1 to 5 MW, and 725 MW of storage qualified for the Clean Peak Standard as of early March. A federal tax credit can cut investment costs by 30 %, and the state’s Clean Peak policy, coupled with a 5‑GW target by 2035, is driving a new wave of megabatteries. Tom Bitting, managing director at Advantage Capital , noted that he does not expect Medway to hold that title for very long. Undersecretary of Energy Michael Judge stated that storing solar energy produced in the middle of the day can bring down the cost of operating the system for everyone. Hans Detweiler, senior director for development at Jupiter Power , wrote that the policy signal, combined with the state’s grid reliability challenges and its decarbonization commitments, creates the conditions for investment at scale. With high electricity prices, growing demand, and a policy framework that rewards clean peak capacity, Massachusetts is poised to accelerate the deployment of large‑scale batteries. The state’s streamlined permitting and 5‑GW target by 2035 should help turn megabatteries from bold outliers into a mainstream component of the regional energy mix.