This paper is based on studies conducted during the European H2020 Ruralization project and analyse the Mission Locale of Bassin Granvillais’ network. It aims to demonstrate how this network acts as a “territorial operator” (opérateur territorial in French) and promotes a new local development integrating socio-ecological transition issues. Indeed, the Mission Locale’s network is founded on solidarity and inter-knowledge within a small territory. It is structured at local level, articulating several administrative scales and bring together different profiles from various structures (public, private, associations). This transversal network works thanks to shared values and exhaustive knowledge of the territory. Built on solidarity and supported by local elected officials, it leads to actions for a better articulation between local socio-ecologic and youth issues, even if it is confronted with some difficulties.