Generating Electricity From Tides: A tidal power plant can be located at the mouth of a narrow bay, where tides cause regular and appreciable rise in the level of water.
A dam with gates is constructed at the mouth of the bay Figure At high tide, the level of the water in the bay rises, and it is allowed to flow in and collect behind the dam. When the tide ebbs, the water level in the sea starts falling. The dam gates are then closed. As a result, the level of water behind the dam remainds higher than that in the bay. When the difference in the levels is sufficient, the gates of the dam are opened, and water is allowed to fall into the bay. This falling water is used to drive turbines connected to electric generators. (In some power plants, the water flowing in at high tide is also used to generate a part of the power) |
For a tidal power plant, the difference between the water levels at high tide and low tide should be about 5 meters. Not many places have this, For this reason, tidal energy cannot be a major source of electrical power.
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