Hydro-Energy and Biomass energy are the renewable sources of energy.

a) Hydro-Energy is the energy produced by fast flowing water. It is a renewable source of energy because it is supplied by the water cycle in nature and it will never get exhausted.

b) Biomass energy is the energy obtained from biofuels such as wood etc. Since wood is a renewable source of energy because if trees are cut from the forest for obtaining wood, then more trees will grow in the forest in due course of time.