Wave and tide

Wave power is a fairly high density form of solar energy since the winds that generate waves are created by heat from solar radiation. Solar power can be transformed into waves with an energy density of 100 kW per metre length of wave crest. The World Energy Council estimates that wave power could meet 10% of world electricity demand. It is regarded as a reliable power source and has been estimated as being capable of meeting 25% or —12 GW of peak UK demand. With an estimated load factor of 50% for wave power this suggests a reliable output of —6GW

The sea is, in effect, a huge mass-spring system which oscillates with a fixed frequency. The average wave length is around 120 m and, in high seas, a wave carries about 100 kW/m of potential energy to be captured by a variety of technologies.

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