The speed of water does not make hydroelectric power more efficient. Efficiency depends on the technology used to convert the kinetic energy in moving water into usable electricity. What water speed does affect, however, is the amount of energy that can be harvested from moving water. More energy can be obtained from faster moving water. This is not because it is converted to usable electicity at a more efficient rate. It creates more energy because faster water has more kinetic energy than slower moving water. This is different from conversion efficiency.
KE = 1/2 m*v^2
(kinetic energy = one-half X mass X velocity-squared)
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