Maine is set to host the world's largest battery energy storage system, with a capacity of 8,500 megawatt-hours (MWh). This project, developed by Form Energy, will be located at the former Lincoln Mill site and is expected to be operational by 2028. The system will use iron-air batteries, which are more cost-effective and environmentally friendly than traditional lithium-ion batteries. The project has received $147 million in funding from the U.S. Department of Energy as part of a larger $389 million grant to strengthen the regional electric grid and advance clean energy in New England.