Conventional sources of energy1. Conventional sources of energy are those sources which have been in use from time immortal.2. They are exhaustible except hydro-energy.3. They cause pollution when used as they emit smoke and ash.4. Their generation and use involve huge expenditure.5. Very expensive to maintain, store, transmit as they are carried over long distances through transmission grids.6. Examples are – coal, natural gas, water, firewood.Non-Conventional sources of energy1. Non-conventional sources of energy have generally been identified in the recent past.2. They are inexhaustible.3. Generally, these are pollution-free.4. Low expenditure required.5. Less expensive due to local use and easy maintenance.6. Examples are – geothermal energy,solar energy, wind energy, tidal energy, biogas energy, nuclear energy.

Conventional Sources of EnergyI. The sources of energy which have been in use for a long time, e.g., coal, petroleum, natural gas and water power.II. They are exhaust able except water.III. They cause pollution when used, as they emit smoke and ash.IV. They are very expensive to be maintained, stored and transmitted as they are carried over long distance through transmission grid and lines.Non-Conventional Sources of EnergyI. The resources which are yet in the process of development over the past few years. It includes solar, wind, tidal, biogas, and biomass, geothermal.II. They are inexhaustible.III. They are generally pollution free.IV. Less expensive due to local use and easy to maintain.

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