Conventional Energy:- Those sources of energy, which have accumulated in nature over a period of millions of years and cannot be quickly replaced when exhausted are called non-renewable sources of energy. This non-renewable source of energy is also called a conventional source of energy. Conventional sources of energy include natural gas, coal, petroleum, electricity (Nuclear, Thermal & Hydro Power plants).
Non-Conventional Energy:- Non-conventional sources of energy are renewable resources of energy like biomass, solar energy, wind energy, tidal energy, etc.