I. The commercial energy has great economic value.
II. This energy pollutes the environment badly.
III. This types of energy are limited in nature.
IV. High capital investment is required in the purification.
V. It is used in urban as well as rural areas.
VI. Coal, petroleum, natural gas and nuclear energy.
I. The non-commercial energy is cheaper.
II. This is pure and keeps the environment clean.
III. Abundant in nature.
IV. It can be used in raw form.
V. It is dominantly used in rural areas.
VI. Cowdung, charcoal, firewood and agricultural waste.