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The tide differences is caused by the gravitation from the sun and the moon and the centrifugal powers on the turning earth. These powers cause a rise of the sea level both on the part of the earth that is facing towards and against the moon. That results in a change between a high tide and a low tide in a period of 12 hours and 25 minutes. A companionship between the sun and the moon causes a change between maximum and minimum tide difference in a period of 14 days. Topographical conditions also have an impact on the tide differences. The speed of tidal waters varies after the deterrents it meets.
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The tide can be used to produce energy in two ways:
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Potential energy:
The energy from the head of water is called potential energy. By using low pressure turbines this energy can be converted into electrical energy.
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Kinetic energy:
The kinetic energy can be converted into electrical energy by using tidal turbines.
Hammerfest Strøm AS was the fist in the world who successfully converted kinetic energy from tidal waters into electrical energy, and delivered this into the commercial energy net.
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Technology