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[[Image:biogas_as_source_of_energy_icon.jpg |right|95px]]
Biogas is a mixture of methane (60%) and carbon dioxide (40%), produced by anaerobic digestion of organic material, usually animal dung, human excreta and crop residue. Small-scale biogas digesters provide fuel for domestic lighting, cooling and cooking (see [[Anaerobic Biogas Reactor]]). Large-scale biogas plants are able to produce sufficient gas to fuel engines to generate electricity. The (thermal) energy available from biogas is about 6 kWh/m³. This corresponds to half a litre of diesel oil and 5.5 kg of firewood. 1 kg of human faeces generates about 50 litres of biogas: 1 kg of cattle dung delivers 40 litres of biogas, and 1 kg of chicken droppings generates about 70 litres of biogas.