It takes several of years for dead organisms to get converted into fuels. Continues usage of these fuels is the major concern of depletion of it. BioCNG is a purified form of biogas, in which all unwanted gases (> 95%) of pure methane gas are removed. BioCNG is exactly the same as the natural gas. In India, we have inadequency in fuel sources, so we depend on oil-rich countries. Today there is a burning need for alternative fuels because fossil fuels are getting vanished. It is therefore necessary to find another source of energy.A replacement to those exhausting resources can be made by using Bio CNG. Bio-CNG is a good automotive fuel and has lower emissions and makes it more environmentally friendly than biogas and other fuels.. Bio-CNG is much cheaper than other competitive fuels. The biogas produced from anaerobic digestion are further processed and hydrogen sulphide and carbon dioxide are removed so that the final product contains 90% - 95% methane to be used as BioCNG. IIf the Government of India focuses on Bio CNG, then there will be a reduction in imports of petroleum products, thus saving a significant amount of foreign exchange every year.