 This paper quantifies the aggregate contributions of collective action in pursuit of the sustainable energy transition in Europe. It estimates the number of initiatives, 10,540 projects, 22,830 people involved, 2,010,600 installed renewable capacities, 7.2 to 9.9 gigawatts for 30 European countries. This article was authored by Valeria Janosvanets, August Whirling, Heather Argenda-Pordler and others.