Hydropower/hydroelectric energy uses water flow to generate electricity using dams or turbines. It's the most efficient renewable energy source dependent on geographical features like rivers. Hydroelectric power plants are efficient and emit no greenhouse gasses during operation. They offer stable and reliable electricity generation. Shifting to hydroelectric power aids in reducing climate change and promotes public health by reducing air pollution associated with fossil fuel-based electricity generation. Using hydroelectric energy contributes to cleaner air, improving respiratory health and overall well-being in communities reliant on this clean energy source. Modern hydro turbines could convert 90% of any present energy into electricity.