Energy derived from the movement of tides or waves is used to generate electricity in areas that have a notable tidal range. Special generators are used to convert the tidal energy into electricity.
The power derived from tidal energy is reliable since the tides are predictable and uniform in nature. The electricity produced is cheap, sustainable and does not pollute nature in any way.
Tidal energy has been used for hundreds of years in many forms of machinery, such as grain mails that mechanically crush grains. The energy produced by the movement of ocean waters due to the gravitational attraction of the moon and Earth is a form of renewable energy, similar to geothermal, wind and solar.