Conventional Sources of Energy:

• Conventional source of energy has been used since the early times.
• Coal, Petroleum, natural gas, hydroelectricity, thermal power are the source of energy.
• All conventional sources of energy except hydro-electricity are exhaustible.
• These sources cause environmental pollution.
• These sources require huge capital.

Non-Conventional Sources of Energy:

• Non- the conventional sources of energy have come into use only recently.
• Wind energy, solar energy, tidal energy, geothermal, biogas are examples of these sources of energy.
• Most of the non- conventional sources of energy are inexhaustible.
• These sources do not cause environmental pollution.
• Small amount of money is sufficient to have these sources.