Energy storage box patent
An energy storage system comprises a cable (13) (13) and a mass (20) suspended from the cable (13) in a shaft (12) (12). The cable (13) is attached to a winch (11) by which the mass may be raised in the shaft (12) to store potential energy, and the mass is lowerable in the shaft (12) to release the potential energy. The mass comprises at least two sections clamped together …