Tidal power or tidal energy is a type of hydropower that converts the energy of tides into electricity or other kind of energy. Tidal energy is more predictable than wind and solar energy. It has the potential to become electricity generator.

Generation of Tidal Energy: It is the only type of energy that is mainly derived directly from the earth-moon system, and is less affected by the earth-sun system. The tidal forces produced by the moon and sun, with the rotation of the earth, are responsible for the generation of tides. Tidal energy is generated by the motion of the earth, moon and sun which interact through gravitational forces. The magnitude of tides is generally described as high tide and low tide. It is caused by the changing of position of the moon and sun relative to the earth.

Because of the fact that gravitational forces within the earth-moon and the earth-sun systems are inexhaustible, tidal power is considered as a renewable energy. The stronger the tide, either in water level or velocity, the greater the potential is has to generate tidal power.

Categories of Tidal Energy:

1. Tidal Stream System: Makes use of the kinetic energy of moving water to power turbines. It is popular because of its lower cost and environmental impact compared to barrages.
2. Barrages: Utilize the potential energy in the difference of the height between high and low tides. Barrages are dams across the full width of tidal estuaries. They are less popular due to high infrastructure cost and environmental issues.
3. Tidal Lagoons: Similar to barrages, but have the advantages of not necessarily having to stretch across the full width of tidal estuaries, lower cost, and the ability to generate power continuously.