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Urban and energy transitions are increasingly seen as being deeply intertwined. The way this relation impacts our approach to energy transition is a current issue for research. Implementing renewable energy sources in built-up areas challenges incumbent supply chains and large technical systems, especially for electricity, gas and heat. Approaches to transition such as the Multi-Level Perspective (MLP) highlight the transformation of socio-technical regimes but have been criticised for overstating stability of regime and for overlooking spatial (and consequently urban) processes. Other concepts are required in order to understand local and non-local relationships between niches and regimes. This paper suggests a constructivist and pragmatic concept for urban energy transition, the Socio-Energetic Node (SEN), thanks to which actors and artefacts can be traced within energy networks. The SEN is a group of elements, which collects, converts and/or supplies energy, built by a decision-maker interacting with stakeholders and regime rules. Having identified SENs in four French eco-districts, we observed how they took shape around continuous energy flows and across decision-making boundaries, highlighting how spatial-scale and place-specificity impact on energy transition. [ABSTRACT FROM AUTHOR]