In 2015 UN member countries adopted the so-called Paris Agreement at COP21, setting the goal of limiting global warming to well below 2 degrees C compared to pre-industrial levels, and to pursue efforts to limit the temperature increase to 1.5 degrees C. To reach that goal, greenhouse gas emissions must become net zero by 2050. This will require significant changes in our energy systems. However, since the Agreement it has become apparent that in many countries, including the UK, there is a gap between commitment and actual policies to guide the market in the direction of energy efficiency solutions like DEN.