Biogas is a combination of carbon dioxide and methane gas produced by anaerobic (without air) bacteria as they consume organic matter causing it to decay. Biogas is another excellent idea for small farmers who cannot afford to be wasting any resources. Animal and human feces can generate biogas by passing it through an anaerobic digester. An anaerobic digester can be constructed with large diameter biogas rubber balloon digester. By passing animal and human feces two valuable products are obtained, one is biogas and the other is effluent. The biogas can be used for cooking, heating, lighting and power generation. The effluent is an excellent fertilizer much better than raw feces. Approximately 25 kg of dung is required to produce 1 m3 of the gas which is equivalent to 0.6 lt of diesel/petrol and can produce 1.3 unit of electricity.