Tidal power attempts to make use of the natural energy potential of tidal activity in the oceans and seas. In simple terms, the high tide is captured and fed through a turbine to generate electricity. Tidal power is a reliable and predictable source of energy. Tides occur periodically and regularly, which can be deduced many years in advance.
There are two ways of creating tidal power: tidal dams and ocean currents. Dams are based on using a barrage at a bay or estuary with a large tidal range. Power is generated primarily at ebb tides as the barrage creates a significant head of water. Waves caused by wind blowing over the surface of the ocean also carry tremendous energy. The total power of waves breaking around the world's coastlines is estimated at 2-3 million megawatts. Ocean wave energy is captured directly from surface waves or from pressure fluctuations below the surface using point absorbers.
Many scientists and engineers across the world are learning to harnes the indefinite power of the ocean waves, and to convert it into electricity with minimal environmental effects. The energy from ocean is environment friendly nature and does not lead to the green house effect. The tidal wave energy is pollution-free and helps in conserving the earth.
I have often thought about tidal energy. Particularly at Deception Pass and the Tacoma Narrows, where the current can be as strong as a river. I think that, properly used, tidal energy could provide a lot of electricity at a low cost to the environment. However, I think corrosion would be an issue.
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