The 1.5-megawatt ICAES system is located at SustainX headquarters in Seabrook, New Hampshire. It takes electricity from the grid and uses it to drive a motor that compresses air and stores it isothermally, or at near-constant temperature.
To do so it captures the heat produced during compression, traps it in water, and stores the warmed air-water mixture in pipes.
When electricity is needed back on the grid, the process reverses and the air expands, driving a generator. No fossil fuel is needed to reheat the air and no emissions are produced, making ICAES a safe and sustainable energy storage solution.