The spatial planning system in Germany is based on three levels: federal, state and regional. In accordance with Section 1 ROG, federal spatial planning provides the legal basis for regional planning based on guiding principles and principles. State planning specifies these requirements before regional planning adapts them to the regional parameters. The European level, which lays down binding guidelines, is superordinate to this. German spatial planning has a large number of planning instruments that have already been in use for several years, but an evaluation of the effectiveness of regional spatial planning after the end of the process rarely takes place. This raises the question of the extent to which nationwide strategies for renewable energies diffuse across the various planning levels and are reflected in spatial developments.