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Concept
Marine energy
Summary
Marine energy or marine power (also sometimes referred to as ocean energy, ocean power, or marine and hydrokinetic energy) refers to the energy carried by ocean waves, tides, salinity, and ocean temperature differences. The movement of water in the world's oceans creates a vast store of kinetic energy, or energy in motion. Some of this energy can be harnessed to generate electricity to power homes, transport and industries.
The term marine energy encompasses both wave power i.e. power from surface waves, and tidal power i.e. obtained from the kinetic energy of large bodies of moving water. Offshore wind power is not a form of marine energy, as wind power is derived from the wind, even if the wind turbines are placed over water.
The oceans have a tremendous amount of energy and are close to many if not most concentrated populations. Ocean energy has the potential of providing a substantial amount of new renewable energy around the world.
There is the potential to develop 20,000–80,000 terawatt-hours per year (TWh/y) of electricity generated by changes in ocean temperatures, salt content, movements of tides, currents, waves and swells
Indonesia, as an archipelagic country that is three quarters ocean, has 49 GW recognized potential ocean energy and has 727 GW theoretical potential ocean energy.
The oceans represent a vast and largely untapped source of energy in the form of surface waves, fluid flow, salinity gradients, and thermal differences.
Marine and Hydrokinetic (MHK) or marine energy development in U.S. and international waters includes projects using the following devices:
Wave power converters in open coastal areas with significant waves;
Tidal turbines placed in coastal and estuarine areas;
In-stream turbines in fast-moving rivers;
Ocean current turbines in areas of strong marine currents;
Ocean thermal energy converters in deep tropical waters.
Marine current power
Strong ocean currents are generated from a combination of temperature, wind, salinity, bathymetry, and the rotation of the Earth.
Official source
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