The energy which is produced from the motion of tides. The tidal energy is classified as the renewable energy source.
How is it utilized?
The gravitational pull of sun and moon produces tides. A tidal barrage is constructed which utilizes the potential energy generated by the change in height between high and low tides.
Is it predictable?
The tide timing can be accurately identified and easily calculated. This makes it a highly predictable source.
Is it a cheap source
It is one of most expensive power generation source. Currently, it is not employed on a large scale.