Little is known about how renewable energy cooperatives (REScoops) try to influence energy conservation among households and the resulting impact. In this article the main research question is: What is the predictive value of renewable energy cooperatives on intention to save energy, engagement in energy-saving actions, and self-reported energy conservation by households? A survey was conducted to answer this question. Data analysis involved multivariate and binary logistic regression on data from two cooperatives: Ecopower (Belgium; N = 1000) and Enercoop (France; N = 8290). Results show that in addition to psychological and socio-demographic variables, REScoop items modestly contribute to the explained variation in engagement in energy-saving actions and reported energy conservation. At Enercoop 18.2% of the respondents indicated that their cooperative contributed to household energy savings; for Ecopower this figure was 36.9%. Moreover, at Enercoop, 38.7% of the respondents reported consuming less energy since obtaining cooperative membership; at Ecopower this was 64.7%. The article concludes with suggestions for future research.