Marine energy offers a clean and renewable power source from which to produce electricity. Oceans provide an enormous energy conversion potential: wave energy alone could technically reach a worldwide potential of 2 TW according to a 1993 estimate by the World Energy Council. The International Energy Agency believes that marine energy could play a sizable role in the world energy mix by 2030. Worldwide research is very active and accelerating. In Asia marine test centres are being set-up and regular conferences dedicated to Asian marine energy research and applications (e.g. AWTEC) focus regional and international researchers on the Asian issues.
Two kinds of energy are available in the ocean: thermal energy from the sun's heat, and mechanical energy from the tides and waves. The different ways to harness energy from the ocean are the following: