This book examines the coordination of renewable energy policies in the European Union using an innovative theoretical approach to explain national policy making. David Jacobs asks, why are national support instruments for electricity from renewable energy sources converging, even though the harmonisation of these frameworks at the European level has failed? Which causal mechanisms lead to cross-national policy similarities? And what are the implications for policy coordination in the EU? The author traces the evolution of feed-in tariffs - the most successful and most widely used support mechanism for renewable electricity - in Germany, Spain and France. He reveals increasing cross-national policy similarities in feed-in tariff design - despite the failure of harmonizing instruments at the European level. He explains these increasing policy similarities by applying policy convergence theory. Policy convergence can occur voluntarily, based on transnational communication, regulatory competition and technological innovations and these findings have important implications for European policy steering. The key to this book is the interrelation of an innovative theoretical concept (coordination of policies in the international arena via voluntary cooperation) with a very topical empirical research focus - the promotion of renewable energies in the EU. It will be essential reading for scholars and students of environmental policy, comparative politics and European studies.