The third Innovation Talk in 2019 was held by an expert in energy market design and grid/market integration of renewable energy technologies, H. Auer from the Technical University of Vienna (TU Wien). The talk focused on the competitiveness of different renewable energy community concepts in a smart energy future. After an introduction to the emerging „Energy Democracy“ paradigm, several examples were given and examined. Amongst them were rooftop-photovoltaic competitiveness in single family houses and various photovoltaic sharing concepts. The talk finished with discussing implications for the electricity system and a lively Q&A session.