Tidal power plants harness the energy of tides by using structures like tidal barrages and tidal turbines. There are two main types of tidal power plants: single basin and double basin. The document outlines the working of tidal power plants, examples from around the world including in India, and discusses their advantages in being pollution free and having no fuel costs, as well as disadvantages like high capital costs and potential effects on marine life. It also notes tidal power is practically inexhaustible due to its source being gravitational interactions between celestial bodies.