SustainX Begins Operating World's First Grid-Scale Isothermal CAES

The 1.5mw ICAES system is operating at SustainX headquarters ... It takes electricity from the grid ... to drive a motor that compresses air and stores it isothermally ... 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.