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Conventional, sources of energy, , These sources’ of, energy are not, abundant, present in, limited quantity, e.g., coal, petroleum,, natural gas., , They have been in use, , for a long time., , They, , replenished, , are not, continuously. They are, formed over a million, , years., , They are called nonrenewable sources of, , energy., , Non-conventional, sources of energy, , These sources’ of, , energy are abundant in, , nature, e.g. solar, energy, wind energy,, tidal energy, biogas, , from biomass etc., , They, , development, , are yet in, phase, , over the past few years., , They are replenished, continuously by natural, , processes., , They are called, renewable sources of, , energy.