The research conducted by the World Energy Council together with ADEME since 1992 concludes that energy efficiency continues to improve all over the world but despite the significant advances, much more can and should be done to improve the efficiency of energy production and use. This is the eighth report in the series of triennial reports and it is the most comprehensive global publication in the area of energy efficiency policies. Drawing on the experiences and lessons from the research conducted in more than 95 countries around the world, the report presents and evaluates different approaches to energy efficiency policies adopted in these countries and helps identify policies which work well and those which do not. The introduction of energy efficiency policies and measures has been growing fast around the world. The increasing number of countries with an energy efficiency law, ten more compared to the 2013 report, signifies a strengthening and consolidation of the institutional commitment to energy efficiency.