Hydroelectric power plants generate electricity by using the energy of flowing water. They typically build a dam on a river, creating a reservoir. When water is released from the reservoir, it flows through turbines, which spin and generate electricity. This process is efficient and produces renewable energy without emitting greenhouse gases. These plants can vary in size, from large facilities that supply power to entire cities to smaller plants that serve local communities. The use of hydropower is a significant part of the global energy mix, contributing to sustainable energy solutions and reducing reliance on fossil fuels.