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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.
How Does Tidal Energy Work. Tidal energy is energy obtained from changing sea levels (the tide moving from high to low and vice versa.) This renewable energy source has great potential as tides are much more predictable than wind power and solar energy which are not at all consistent (seasons, bad weather, etc...).idal Barrages. Tidal barrages are very similar to the Dams in hydroelectric plants, except that they are much larger as they are built across an estuary or bay. The tidal range (difference between high and low tide) needs to be in excess of five metres for the barrage to be workable.