Coastal science and societies
A tidal power plant uses the rising and falling movement of tides to create the level differential needed to produce energy. EDF was a precursor with this technology when, in , it built the tidal power plant on the mouth of the La Rance River in Brittany, France.
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It is one of just two such plants in the world along with Sihwa in South Korea. The La Rance plant has an installed capacity of MW distributed between 24 bulb-type turbine generators, each with a capacity of 10 MW. The La Rance plant operates according to two different modes: ebb only generation or flood and ebb generation. At the end of the incoming tide, the generator operates in reverse mode and pumps seawater in order to further raise the level behind the barrage before slack water is reached the short period when there is no movement either way in the tidal stream.
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- Tidal Power | EDF France;
Back to Marine Energy. Tidal Power. Tidal turbines are a new technology that can be used in many tidal areas.
Tidal Energy – Bluewater
They are basically wind turbines that can be located anywhere there is strong tidal flow. Because water is about times denser than air, tidal turbines will have to be much sturdier than wind turbines. They will be heavier and more expensive to build but will be able to capture more energy. All rights reserved.
Ocean energy. Generating technologies for deriving electrical power from the ocean include tidal power, wave power, ocean thermal energy conversion, ocean currents, ocean winds and salinity gradients. Of these, the three most well-developed technologies are tidal power, wave power and ocean thermal energy conversion.
Waves are caused by the wind blowing over the surface of the ocean. There is tremendous energy in the ocean waves. One way to harness wave energy is to bend or focus the waves into a narrow channel, increasing their power and size.
The waves can then be channeled into a catch basin or used directly to spin turbines. There are no big commercial wave energy plants, but there are a few small ones.
Small, on-shore sites have the best potential for the immediate future; they could produce enough energy to power local communities. Japan, which imports almost all of its fuel, has an active wave-energy program.
- U.S. Energy Information Administration - EIA - Independent Statistics and Analysis.
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Related Ocean Energy: Tide and Tidal Power
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