International audienceSociotechnical niche is the relevant space to foster sustainability transitions. With this research we propose to better understand and characterize the emergence and diffusion processes of the sociotechnical niche. We rely on the case of a local authorities association dedicated to waste management. Acting on its territory, this public actor pursues a waste reduction strategy. It launches a strategy to foster innovation projects and new recycling chains through various cooperations. We see how a niche can emerge from its territorial dimension, and how the expertise of the “acteur moteur“ reinforces attractiveness of the niche for other actors.La niche sociotechnique constitue l’espace privilégié pour développer des in...