The discussion about energy perspectives up to 2050 and beyond has started. There seems to be a verbal consensus about the necessity of ambitious climate change mitigation policies, whereas proposed solutions vary from aiming at 100% renewable energies and setting up appropriate policy frameworks to a mix of renewables with so-called clean fossil and nuclear energy. This book provides an analysis of the different approaches and the reasons why there is no sustainable alternative to aiming at 100% renewables – and how this vision could come true. The book provides an overview and in-depth analysis of a vital debate. It describes policy options and their impact on renewable energy development and deployment in Europe