Biogas represents an alternative source of energy, derived mainly from organic wastes. In India, the use of biogas derived from animal waste, primarily cow dung, has been promoted for over three decades now. According to the 1997 Livestock Census, the cattle population in the country is about 290 million. The estimated potential of household biogas plants based on animal waste in India is 12 million. Till March 2009, under the National Biogas and Manure Management Programme, over 4.1 million biogas plants in the capacity of 1