Biogas is a proven and widely-used source of energy in Asia. There has been a renewed interest in biogas owing to rising concerns over the greenhouse effect, high price of fossil fuels, and other environmental and health concerns. The Clean Development Mechanism (CDM) opens up new opportunities for the promotion of biogas. As a regional centre, APCAEM is involved in institutional- and policy-related work on agricultural engineering and agro-industry. This publication will be useful for policy- and decision-makers in governments, the donor community, and the privater sector dealing with biogas programmes.