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.