Hydroelectricity
Hydro power is used all over the world to generate electricity from moving water. Water flows out of a dam through pipes in order to operate turbines which generate the required electricity.
What happens is that the potential energy in the stored water is converted into kinetic energy in the falling water and when it flows through a turbine this energy is extracted and used to generate electrity.
Generating electricity from flowing water is a renewable energy source and it produces no dangerous climate change gases. However it is thought that a new dam which floods huge areas of vegetation will produce large amounts of co2 from the flooded organic matter.