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tidal turbine (s) (noun), tidal turbines (pl)
Ocean-power technology splits into two broad categories, tidal and wave power.
  1. Wave power involves the use of the up and down motions of the waves to produce electricity.
  2. Tidal power consists of harnessing the action of the tides with underwater turbines, which twirl like wind machines.
  3. A third type of power generation, called ocean thermal, has the objective of exploiting temperature differences between the surface and the deep ocean, and is primarily applicable to tropical areas.
  4. Some experts claim that ocean electrical power has more advantages than wind power because water is about 850 times denser than air, and so it consists of far more energy.
  5. The ocean's waves, tides, and currents are also considered to be more predictable than the wind.
  6. The negative aspect is that seawater can batter and corrode machinery, and costly undersea cables may be needed to bring the electrical power to shore and the machines are considerably more expensive to build.
  7. General Electric, which builds wind turbines, solar panels, and other equipment for virtually every other type of energy, has so far stayed clear of ocean energy because of the much greater costs.
—Based on information from an article titled:
"New push to tap the oceans for electricity" by Kate Galbraith
in The Global Edition of the New York Times; September 24, 2008; page 18.
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