Definition of conventional and non conventional energy sources
Conventional sources of energy can be described as non-renewable sources of energy which have been used since a long time.Conventional sources of energy are used extensively by mankind and the magnitude of usage is so high that the reserves have got depleted to a great extent. Example: Coal, petroleum, natural gas
Non conventional sources of energy are mostly renewable or available in abundance on earth. They are ecologically safe to use as well. Example: wind/ solar/ hydro/ geothermal energy