Wave energy is stored, concentrated, predictable and renewable energy. Waves are created by the transfer of energy from the wind as it blows over the surface of the water. The energy in waves comes from the movement of the ocean and the changing heights and speed of the swells.
At a wave power station, incoming waves cause water in a chamber to rise and fall forcing air in and out of a hole at the top of a chamber. In this hole a turbine is turned by the rushing air which in turn turns a generator to produce electricity. Offshore wave energy has the potential to be one of the most environmentally-benign forms of electricity generation with a minimal visual impact from the shore.
Waves form a potentially large worldwide energy resource, estimated at more than two terawatts of energy equal to 2000 large oil, gas, coal, or nuclear power stations.