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Compressed air energy storage uses pressurized air as the energy storage medium. An electric motor-driven compressor is used to
pressurize the storage reservoir using off-peak energy and air is released from the reservoir through a turbine during on-peak hours to produce energy. The turbine is essentially a
modified turbine that can also be fired with natural gas or distillate fuel.
Ideal locations for large compressed air energy storage reservoirs are aquifers, conventional mines in hard rock, and hydraulically mined
salt caverns. Air can be stored in pressurized tanks for small systems.
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