The feasibility of 100% renewable electricity supply in top industrialized countries such as Germany is no longer a futile exercise, but rather a realistic perspective for which thorough recent studies indicate how the transition could be achieved; [3] including the roadmaps of Jacobson and co-workers to convert 139 countries of the world to wind, water, and sunlight using tech- nologies selected to provide electricity which include wind, concentrated solar power (CSP), geothermal, solar PV, tidal, wave, and hydropower