Introduction
"On n'a pas de pétrole, mais on a des idées" (literally, "we don't have oil, but we have ideas").
All French people born before 1970 can remember this governmental ad campaign trying to nudge them to save energy. At the time, the objective was more to save money than to save the planet. Climate change has just reinforced the incentive to try and reduce electricity consumption. As in many sectors though, the thinking about how to best nudge households has evolved quite a lot over time. The 70's style top down governmental communication is no longer...