A
system for converting
electricity into pressurized air, and converting pressurized air into
electricity. The
system includes a pressurized air reservoir, two
high pressure tanks, a pump and an electrical motor
convertible into a hydro
turbine and an
electricity generator, a volume of water equal to a tank's volume, a set of controllable valves for connecting and disconnecting independently each tank, to the
atmosphere, to the pump inlet and outlet, and to the air reservoir. In use, a volume of water in the first tank is pumped into the second tank, the air in the second tank is compressed and flows into the air reservoir. By changing position of the valves, the operation repeats with opposite roles of the tanks. In an electricity generating mode, the
system operates by transferring pressurized air from the air reservoir into the first tank which is full of water, the pressurized water flowing through the hydro
turbine generator thereby generating electricity.