Abstract: An energy storage system comprises a cable (13) and a mass 20 suspended from the cable (13) in a shaft (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 around the cable (13). More particularly, the system comprising a plurality of cables (13) and a plurality of multi-section masses each suspended in the shaft (12) by a respective cable (13), the masses being raised and lowered in synchronism in the shaft (12). The multi-section masses fit together side-by-side in the shaft (12) to form an overall cylindrical mass body, the multi-section masses each forming a quadrant of the cylindrical mass body.

Abstract: An energy storage system comprises a cable (13) and a mass 20 suspended from the cable (13) in a shaft (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 around the cable (13). More particularly, the system comprising a plurality of cables (13) and a plurality of multi-section masses each suspended in the shaft (12) by a respective cable (13), the masses being raised and lowered in synchronism in the shaft (12). The multi-section masses fit together side-by-side in the shaft (12) to form an overall cylindrical mass body, the multi-section masses each forming a quadrant of the cylindrical mass body.

Abstract: An apparatus for converting wave energy into electrical energy comprising a first floating hull (201) interconnected to a second floating hull (202). A winch mechanism for use in raising a weight suspended on a cable (14). The winch mechanism is operated in response to movement of the first hull (201) relative to the second hull (202), and a generator driven by the downward movement of the weight. Moreover, a method for converting wave energy into electrical energy.

Abstract: An apparatus for converting wave energy into electrical energy comprising a first floating hull (201) interconnected to a second floating hull (202). A winch mechanism for use in raising a weight suspended on a cable (14). The winch mechanism is operated in response to movement of the first hull (201) relative to the second hull (202), and a generator driven by the downward movement of the weight. Moreover, a method for converting wave energy into electrical energy.