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The tidal range is the vertical difference between the high tide and the succeeding low tide. Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
Tidal energy harnesses the natural ebb and flow of the tides to produce power. Tides are created by the gravitational pull of the moon and sun, combined with the rotation of the earth. Tidal energy can be harnessed both in the sea, and in tidal rivers and estuaries.On some shorelines, water levels can vary up to 12 metres. It is this drastic change in water level that makes the first type of tidal energy â tidal barrages â possible.Tides can occur once or twice a day depending on location.idal energy can be harnessed both in the sea, and in tidal rivers and estuaries. On some shorelines, water levels can vary up to 12 metres. It is this drastic change in water level that makes the first type of tidal energy â tidal barrages â possible. Tides can occur once or twice a day depending on location.