Biomass is the energy derived from remains of living organisms such dry leaves, agricultural waste, wood shavings etc. and animal excreta such as cow dung.It is a renewable source of energy.The devices used for utilizing bio mass (chullahs, biogas plants) can be installed at all places.The use of bio-mass produces a lot of smoke.It is used for cooking, illumination etc.
Hydroelectricity is producing by the potential energy of water at height.It is also a renewable source of energy.It requires construction of dams on rivers and its plants can be built only at few places.It requires a huge investment but it is pollution free.The electricity produced can be used to run all type of electric appliances.
