Recent developments of behavioural sciences offer valuable insights on human thinking and choices. They indicate the existence of many common human biases; the context and considerations other than personal utility maximization often affect human decisions. Hundreds of governments around the world are integrating these findings into the designing of their policies and measures. The advantage of gentle nudging for scaling up energy efficiency actions are their low costs and high effectiveness. This webinar will present how to apply behavioural insights to close the energy efficiency gap in the municipalities.