Locked within the rise and fall of tidal waters is an abundance of free energy. The water motion can be exploited by a tidal turbine, which is essentially an underwater version of a horizontal-axis wind turbine. Tidal turbines benefit from both a reliable and a predictable energy source – the rise and fall of the tide driven by the steady motion of the moon – unlike wind turbines which are at the mercy of the wind. As water is approximately 800 times denser than air, for the same energy output (rotor speed) an underwater turbine can be approximately 5 times smaller compared to an equivalent industrial wind turbine.
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