Fourth Power

The system converts low-cost electricity to heat, can hold it for weeks, and returns electricity on demand. The company pitches it as a combustion-free alternative to gas peaker plants for one- to three-day events, aimed at utilities, power producers and large loads such as data centers that need faster grid interconnection.

Fourth Power, Inc. is based in Bedford, Massachusetts. It has begun commissioning the first full-scale demonstration of its multi-day energy storage technology.