Tidal Energy is the power produced by the surge of ocean waters, especially during the rise and fall of tides. It is an essential form of renewable energy. Though it is not used on a very great scale, the potential of tidal energy in the coming times is immense. Recent advancements in turbine technologies have greatly improved the chances of harnessing electricity from tidal energy. Tidal power is harnessed from Oceanic tides. Currently, tidal energy is harnessed by three different methods, namely, tidal streams, barrages and tidal lagoons.

Placing turbines in the tidal streams is the most common method of producing electricity; however, the machines used are large, creating environmental hazards. The turbines are effective in shallow water, and they turn slowly to avoid causing any danger to marine life. Strangford Laugh in Northern Ireland is credited with hosting the first-ever tidal power station in the year 2007. Another type of tidal energy generator uses a large dam called a barrage. Barrages can be constructed across tidal rivers, bays and estuaries.

Turbines inside the barrage can be used to harness the power of tides. As the tide rises, the barrage gates are open. At high tide, the barrage gates close, creating a pool or tidal lagoon. The water is subsequently released through the turbines of the barrage, creating energy at a pre-determined rate. The tidal power plant at the Rance River estuary in Brittany, France, uses a barrage. The final type of Tidal energy generator involves the construction of a tidal lagoon.