This report reviews efforts under way in a number of OECD countries to advance innovation in energy technology, with a particular focus on hydrogen fuel cells. It compares energy innovation systems in Canada, France, Germany, Italy, Japan, Korea, Norway, the United Kingdom and United States to identify the roles of government, industry, universities and other public research organisations in the innovation process. It also examines the policies governments are implementing to finance needed research and development and to stimulate market demand for innovative energy technologies.