Biogas is an environment friendly and economically viable source of energy in the rural areas. Biogas technology has been disseminated in India through the National Project on Biogas Development (NPBD), Government of India. As of now, over 2.5 million biogas plants have been installed in the country. Action for Food Production (AFPRO), a non-governmental organization (NGO), has played a leading role in the field-level implementation of NPBD on a large scale, ...