The article discusses how tidal power works by harnessing the gravitational effects of the Moon and Sun to generate electricity. It explains different types of tides and factors that affect tidal range, such as shelving and resonance. The design of tidal power schemes depends on tidal amplitudes, with sites having large amplitudes being ideal for development. The article also covers existing tidal energy plants, construction methods like tidal barrages, and the economic and environmental aspects of tidal power.