Local citizen-led initiatives relating to energy are developing strongly in Anglo-Saxon countries and a growing body of research is examining their innovative potential. In France, similar grassroots initiatives. - albeit with certain specificities - only began to emerge recently and so far, very few studies have dealt with them. The purpose of this article is to propose an exploratory and in-depth analysis of one advanced French case: Le Mene, a pioneer in local energy autonomy. We examine the conditions under which the initiative emerged and the processes through which a grassroots innovation is formed. In studying this case (interviews, analysis of documents), comparing it with other sources of data (expert interviews, comparative observation of other initiatives) and taking stock of various social sciences studies, we show that a social innovation was produced in Le Mene through the hybridisation of actors, sociotechniques and discourses. This initiative was innovative not only in terms of the scope of the mechanisms implemented, but also in terms of the social organisation behind the development of the projects and the capacity to use energy production as a social resource. Finally, we reflect on the possible diffusion of these grassroots initiatives and their policy implications in France. (C) 2014 Elsevier Ltd. All rights reserved.