Hydro power, or hydropower, is a renewable energy source that generates electricity by using the energy of flowing or falling water. Typically, this is achieved through dams built on rivers, where water is stored in a reservoir. When released, the water flows through turbines, converting its kinetic energy into mechanical energy, which is then transformed into electrical energy. This form of energy is considered clean because it produces no direct emissions, helping to reduce greenhouse gases. Countries like Norway and Canada rely heavily on hydro power for their electricity needs, making it a significant contributor to the global energy mix.