Although the transition to energy supply through renewables (RE) is, in general, politically accepted in Germany, its progress is slowed by conflicting interests, primarily nature conservation and protesting residents. This study aims to find ways to solve these conflicts in Germany. To this end, the researchers developed a geospatial model that calculates RE potentials and vulnerabilities of nature and humans. Both data input and some evaluation standards are variables in the model. The outcomes are compared to an estimated total energy demand in 2050. Two ambitious scenarios ("no regret" and "compromise") show that a maximum of 4% of the German territory is available to meet the energy demand. This demand can be met using PV in urban areas and wind in rural landscapes without significantly impairing nature's and people's wellbeing. Solar parks and other potentials not considered in the model are treated as a reserve, which can be included if the energy targets are not met under the assumed scenario conditions. Such reserves also provide flexibility for co-determination in public participation.

Background: The transition of the energy system to renewable energy depends on how successfully the national objectives can be implemented at the lower planning levels. Germany pursues an incentive-oriented policy that is not spatially targeted and lets regional and local stakeholders determine where and how renewable energies are used. A core question is how to achieve the national goals, in a federal system that allows freedom of planning for the local communities. The aim of this paper is to show the discrepancies between the current expansion of wind energy and the necessary expansion that is derived from a scientific analysis. Methods: The study examined the policy objectives for the expansion of wind energy, based on a literature analysis. In a second step, the regulatory competences and spatial planning at the various levels and their influence on the expansion were explored. In a third step, the current procedure was compared with scientific scenarios of the energy system in 2050 and concretized using the example of the Hannover Region. Results: The theoretical and empirical analysis shows that people at regional level underestimate their responsibility for contributing to energy transition. The expansion targets for wind energy in the Hannover Region projected in the scientific scenario are above the minimum demand that the local authorities have assumed. The same applies to the state of Lower Saxony, which underestimates its own wind energy potential and thus its necessary contribution to achieving the national targets. Conclusions: We propose a nationwide coordinated strategy for the successful implementation of the energy transition. With the methodology described, regional targets can be determined and the responsibility of the region and the local actors can be clarified. With the help of spatial planning and public participation, the energy transition can be achieved with this approach.

Der Ausbau der Biogasproduktion verursacht regional sehr unterschiedlich ausgeprägte Nutzungsänderungen der Agrarflächen mit zum Teil erheblichen Auswirkungen auf den Naturhaushalt. Zur Minimierung von Konflikten sollte die räumliche Gesamtplanung auf der kommunalen und regionalen Ebene gestärkt werden.

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