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SustainX Inc. has completed its first megawatt-scale isothermal compressed air energy storage (ICAES) system. The 1.5 MW system is operating at the company's headquarters in Seabrook, N.H.

SustainX says the ICAES system stores and returns megawatts of electricity to provide long-term grid stability and support integration of renewable energy sources like wind and solar. 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.

"Our isothermal CAES technology is a dramatic improvement over other bulk energy storage methods because it uses no fuel, produces no emissions, is power and energy scalable, and can be sited virtually anywhere," says Tom Zarrella, SustainX president and CEO.




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