At the beginning of 2010, the ForschungsVerbund Erneuerbare Energien (FVEE) [RenewableEnergy Research Association] was encouragedby the German Federal Environment Ministry to devise a concept for a German energy supplysystem in the year 2050, which is 100% based on renewable energy. The Energy Concept 2050, which has been developed by 7 of the research association’s member institutes, is acontribution to the Federal Government’s Energy Concept which is scheduled to be adopted in October 2010. It includes the future energy demand of all areas of use: electricity, heat and fuel.