Confronted with the illegal war of aggression launched by Russia against Ukraine, the German government is keen to reduce Germany’s dependence on energy imports from Russia as quickly as possible. Various technical solutions, along with a diversification of energy import sources, have dominated this debate. The possibility that consumers could change their energy consumption patterns has hardly been considered so far. Yet studies in behavioural science suggest that the savings that could be achieved in the near term are significant and could help to strengthen energy security.