Biogas is produced by the process of anaerobic digestion (AD) from biodegradable organic residues including agricultural slurries, food, vegetable and garden wastes, sewage and source-segregated municipal waste.

Biogas is normally produced as a mix of 60% methane and 40% CO2

Biogas can be used to generate electricity with some surplus heat,

Biogas can be upgraded, by removing the CO2, to produce biomethane (at least 95% methane) and can power gas vehicles or be injected into the gas grid. Biomethane powered vehicles are well established on the continent but not in the UK.