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Tidal energy

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Tides are caused mainly by the gravitational —pullpushloadpress of the Moon on the oceans. Because their timing can be predicted years in advance, tidal power is regarded as a more —dependentreliabletrustfulfaithful source of energy than wind or solar power. However, building a barrage across an estuary can —disputedisruptdisposedisclose the habitats of birds and fish, and the —prohibitedprohibitingprohibitiveprohibition cost of construction has discouraged many governments. As a result, tidal schemes remain —thinnarrowbriefscarce when compared with other forms of renewable generation around the world.