wave power
Power obtained by harnessing the energy of water waves. Various schemes have been advanced since 1973 when oil prices rose dramatically and an energy shortage threatened. In 1974, the British engineer Stephen Salter developed the ‘duck’ – a floating boom, the segments of which nod up and down with the waves. The nodding motion can be used to drive pumps and spin generators. Another device, developed in Japan, uses an oscillating water column to harness wave power. A major technological breakthrough will be required if wave power is ever to contribute significantly to the world's energy needs, although several ideas have reached prototype stage.
