Tidal power, also called tidal energy, is a form of hydropower that converts the energy of tides into electricity or other useful forms of power. The ocean, covering 70% of the Earth’s surface, produces a vast amount of mechanical energy in the form of tides and waves. Tidal power has the potential for future electricity generation. Tidal power is a major growth area, with a global potential up to 100GW installed capacity. As non-renewable energy sources such as coal, oil etc., are being tapped out, new and innovative ways of creating energy of our needs being explored. The extraction and use of fossil fuels are causing many environmental problems of the world, such as climate change, the ozone layer destruction and so forth. The combustion of fossil fuels created an excess of carbon dioxide, an acceptable power generation technology must be mechanically sound, environmentally acceptable, and economically profitable in order to become a real alternative for builders of new capacity. So, renewable energy is the only solution in order to meet up the future crisis. Solar, wind, hydal, wave, tidal, geothermal, biomass, fuel cell etc., are the renewable energy sources. Among them tidal energy is an old but efficient method. Tidal power is classified as a renewable energy source, because tides are caused by the orbital mechanics of the solar system and are considered inexhaustible within a human timeframe. Energy from tidal power is also a form of pollution free energy, which has a lot of potential. Tidal power may be an alternative solution to meet up recent power crisis. Given proper care in design, siiting, deployment, operation and maintenance, ocean wave and tidal power could be one of the most environmentally benign electricity generation technologies yet developed.