Behavioural programmes have been widely used and reported by US utilities as part of their energy efficiency portfolios, for more than a decade.
Back in 2014, a paper by Anne Dougherty presented at the IEPPEC conference in Berlin already provided a summary about the methods commonly used to evaluate the impacts from typical programmes and the issues these methods raised: https://energy-evaluation.org/wp-content/uploads/2019/06/2014-berlin-anne-dougherty.pdf
More recently, a protocol to evaluate energy savings from behavioural programmes in the residential sector was published as part of the Unified Methods Project funded by the US Department of Energy: https://www.nrel.gov/docs/fy21osti/77435.pdf
Could Europe learn from the US experience in this field?
Feel free to start the discussions, share your views or further references by commenting this post!