Compressed Air Energy Storage (CAES) system utilizes excess electricity in the grid to compress the ambient air in an underground reservoir, called the underground cavern. The underground cavern must be strong enough to withstand the heat made by the pressurized air and the pressure of high-density air.
CAES is built to help the grid to balance the supply and demand to electricity by storing pressurized air during low demand for electricity and releasing it when demand is increased.
During supplying electricity to the grid, it is discharged the compressed air into the turbines and the pressurized air expands in there and releases an enormous amount of heat energy which exploited to circulate through turbines. Then, turbines produce electricity and eventually, it will be sent into the grid.
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