Biogas is one of the most used alternative sources for renewable energy production. It is the result of the fermentation, in the absence of oxygen and at controlled temperature, of substances of organic origin (animal or vegetable) by numerous bacteria.

This degradation process of biomass (coming from agricultural residues, zootechnical or sewage wastewaters, integration crops, organic fraction of municipal waste collected differently, etc.) is called anaerobic digestion. The result is composed of biogas, which has a high calorific power and can be converted into electricity and heat and purified to natural gas and fermentation residue, the digestate, a liquid material that is used as a natural fertilizer in crops.

Biogas is indicated by international institutions as one of the main resources that can guarantee energy autonomy and the gradual reduction of the current state of the air pollution and the greenhouse effect. The biogas industry,therefore, will increasingly play a decisive rolein the energy transition, in the process towards decarbonisation and in the green and circular economy.