Hydropower is a renewable, non-polluting and environment friendly source of energy. It is very simple, easy, super swift and simple concepts. Moving water turns a turbine, the turbine spins a generator, and electricity is produced. It all begins with the energy in the moving water. The use of water falling through a height has been utilized as a source of energy since a long time. It is perhaps the oldest renewable energy technique known to the mankind for mechanical energy conversion as well as electricity generation.