The ocean has currents and tides that circulate round the world. This vast amount water with high potential movement produces immense amounts of energy. Tidal is a form of hydropower that converts the energy of tides into electricity or other useful forms of power. Tidal energy is produced using tidal energy generators. Some of the oldest ocean energy technologies make use of tidal power.

All coastal areas experience two high and two low tides. These tidal differences can be harnessed into electricity, but the difference between high and low tides must be at least five meters or more. Large underwater turbines are placed in regions with high tidal movements, and are designed to capture the kinetic motion of the ebbing and surging of ocean tides in order to produce electricity.

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