What is the difference between biogas and biomethane?

Biogas is the direct product of a methanisation unit. It is produced by the fermentation of organic matter in the digester. It comprises 60% methane and 40% CO2. It can be used for cogeneration of heat and electricity.

Biomethane is a biogas from which the carbon dioxide, hydrogen sulfide and water have been removed. As a result of that purification process, the biomethane has the same characteristics as natural gas and can be injected into the grid. Biomethane production thus helps increase the proportion of green gases in our gas consumption, with benefits for the energy transition and the reduction of greenhouse gas emissions.