To achieve the ambitious climate targets of the Federal Climate Change Act a rapid expansion of renewable energies, particularly wind and photovoltaics (PV), is crucial. In this context, achieving 215 GW of installed PV capacity by 2030 has become a specific target of the Renewable Energy Sources Act (EEG). This report deals with the central role that buildings play in meeting PV expansion targets, with the potential to cover up to 25% of EU electricity consumption through rooftop PV.

What models currently exist to promote photovoltaic systems on multi-unit buildings, and how can the regulatory framework be improved to further accelerate expansion? On 25 April 2023, three different models for the generation and use of PV electricity for multi-party buildings were presented in keynote speeches and then discussed with the expert audience.

Roofs still offer enormous potential for solar electricity generation. In order to achieve the ambitious expansion targets of the German government, this potential must be raised. In a new project, Ecologic Institute and the Center for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW) analyze different system concepts and evaluate their economic viability. Existing barriers to the expansion of photovoltaic systems on buildings are identified and the extent to which the Renewable Energy Sources Act 2023 will remove these barriers is examined. As a result of the project, recommendations for further improvements of the regulatory framework will be elaborated.