This paper investigates the decision-making processes of mayors on the municipal level in Brandenburg, Germany, to support 100% renewable energy policies as well as the respective key success factors. Three different cases and their specific settings are examined: (1) Turnow-Preilack with Germany's largest solar power plant, (2) Prenzlau, a town claiming the title 'City of Renewable Energy’ and (3) the village of Feldheim, the first energy independent settlement in Germany.

The transition from a fossil fuel-based energy system to a renewable one has emerged as a priority for many governments. This, in turn, has facilitated a rapid increase in renewable energy investments. However, this development raises important questions about the sustainability of energy governance when it comes to access and control of energy, public participation and transparency. In this article, decentralized renewable energy production is presented as one of the pathways towards more participation in sustainable energy development. Community renewable energy projects help to enable communities to act as citizens, rather than consumers. In this article, we aim to understand the interactions between community renewable energy transition and collective practices of citizenship. We investigate collective practices in energy development within the ecological citizenship framework by addressing the extent to which each community’s energy project displays the characteristics of ecological citizenship, in terms of how their collectivity is organized, articulated and shaped the future goals and vision. Based on the empirical data collected in Feldheim (Germany) and Samsø (Denmark), we find out that when collectivity is embedded in community renewable energy development, it resonates with the particularities of communitarian ecological citizenship that has a local focus rather than a political focus, and primarily prioritizes the cohesiveness and interests of the community (i.e. economic development) rather than the global commitment to sustainability discourses (i.e. climate change). This article also raises questions about the importance of intentionality in bringing about ecological outcomes of renewable energy transitions.

In times of ongoing urbanisation and unabated climate change, cities face increasing demands for improvements in urban climate change governance. This article investigates the activities of transnational municipal networks that were set up in response to climate change and analyses their potential to influence local climate governance. On the basis of a conceptualisation of transnational municipal climate networks (TMCNs), quantitative data on the proliferation of TMCNs amongst German municipalities were assessed and complemented by a qualitative analysis of scientific and grey literature and interviews. The quantitative analysis reveals a wide proliferation of TMCNs in Germany. Finally, the results show that TMCNs have different profiles which can be categorised into four functions all of which might influence local climate change governance. The functions are ‘platform’, ‘consultant’, ‘commitment broker’ and ‘advocate’. It is concluded that TMCNs can play a crucial role in fostering climate governance.