Distinguish between Conventional and non-conventional sources of energy
| Conventional Sources of Energy | Non-conventional Sources of Energy |
| Conventional sources of energy are those sources which have been use since the early times. | Non-conventional sources of energy have generally been identified in the recent past. |
| They cause pollution when used as they emit smoke and ash. | Generally these are pollution-free. |
| Their generation and use involve huge expenditure. | Low expenditure required. |
| Very expensive to maintain, store, transmit as they are carried over long distances through transmission grids. | Less expensive due to local use and easy maintenance. |
| Examples are � coal, natural gas, water, fire-wood. | Examples are � geothermal energy, solar energy, wind energy, tidal energy, biogas energy, nuclear energy. |
