The threat of global warming calls for a major transformation of the energy system in the coming century. A positive and effective outcome of the development and implementation of municipal energy concepts relies heavily on public participation. Based on user research through qualitative interviews and an online questionnaire in Germany, this paper presents design implications regarding digital participatory technology for municipal energy concepts. The findings include reduction of barriers to enable participation, encouragement of discussion and debate, monitoring the progress and providing feedback. The proposed implications aim to increase public participation for municipal energy concepts and motivate citizens towards a more sustainable lifestyle. Further work is needed to validate if the design implications entirely fulfill their purpose.