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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.
[[Image:Biogas_as_source_of_energy.PNG|thumb|right|150px200px|[[Biogas as source of energy |Biogas as source of energy]], in Bangladesh (for credits, click the picture)]]
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=== Applying conditions ===
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<li>The main prerequisite of biogas use is the availability of specially designed biogas burners or modified consumer appliances. </li>
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===Field experiences===
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=== Manuals, videos, and links ===
* General information about Biogas as source of energy [http://www.snvworld.org www.snvworld.org ]
* General information [http://www5.gtz.de/gate/ http://www5.gtz.de/gate/]