Innovation in Energy Technology : Comparing National Innovation Systems at the Sectoral Level Innovation in energy technology is becoming increasingly important to meet growing demand for energy amidst concern about the security of energy supplies and calls for greater environmental protection. Governments across the OECD are investing considerable sums in R&D on new energy technologies such as fuel cells and seeking ways to speed their deployment and smooth the transition to a more sustainable hydrogen based economy. What steps are they taking What lessons can be learned from the experiences of other countries How do energy innovation systems differ among countries and how can po