Hydroelectricity is a form of renewable energy that generates electricity by using the flow of water. Typically, water from rivers or dams is directed through turbines, which spin and produce electricity. This process harnesses the kinetic energy of moving water, making it a clean and sustainable energy source. Hydroelectric power plants can vary in size, from large facilities that supply power to entire cities to small systems that serve individual homes. The use of dams can help control water flow and create reservoirs, ensuring a steady supply of water for electricity generation, especially during dry periods.