[[Image:Biogas_as_source_of_energy_icon.jpg|right]] Ms Jharna, resident of Dhopagata village, and housewife of the family, informed that earlier she used to cook with kerosene and she was not comfortable with it as the operation and maintenance of the kerosene oven is difficult. Now she is enjoying cooking with biogas and she finds it as good as natural gas.From: Quazi, A.R. [NGO Forum for DWSS] Study on the re-use of excreta in Bangladesh. In: Environmental Sanitation Case Studies to be published by IRC International Water and Sanitation Centre. 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|150px|[[Biogas as source of energy |Biogas as source of energy]], in Bangladesh (for credits, click the picture)]]