I was thinking about Hydroelectric generator turbines which are built underwater to utilize the energy of the waves/current. I was thinking that if the waves are generated by the moons gravitational pull..... would the presence of the moon cause the waves to continually being made, resulting in a seemingly infinite source of energy? Perhaps this is the wrong section of the forum, but is gravity an infinite force since it is created by the presence of Mass? Whether it's gravitons doing it or simply bends in the Space-Time Continuum. Ideas???