| Conventional Sources of Energy | Non-Conventional Sources of Energy |
| 1. Conventional source of energy have been used since the early times. | 1. Non- conventional source of energy have came into the use only recently. |
| 2. Coal, Petroleum, natural gas, hydro-electricity, thermal power are the source of energy. | 2. Wind energy, solar energy, tidal energy, geothermal, biogas are example of these source of energy. |
| 3. All conventional sources of energy except hydro-electricity are exhaustible. | 3. Most of the non- conventional sources of energy are inexhaustible. |
| 4. These source cause environmental pollution. | 4. These sources do not cause environmental pollution. |
| 5.These source require huge capital. | 5. Small amount of money is sufficient to have these sources. |