Energy storage methods
Mechanical storage
Energy can be stored by pumping water up to a certain height and released into electrical energy when needed.
Pressurized air is a cheap energy storage method using electrical energy cheap while being not happening peak loads. Pressurized air can be stored in underground reservoirs. The pressurized air is then released when peak loads for supplying electric energy and can be heated using the heat removed by machines or electric generators to increase the pressure.
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