​To highlight the characteristics of successful energy efficiency program design, Jan Rosenow examined why the United Kingdom’s highly ambitious “Green Deal” residential insulation initiative failed. Speaking at a side event of the COP24 (Conference of Parties to the United Nations Framework Convention on Climate Change) in Katowice, Poland, Dr. Rosenow ​shared five key elements of successful efficiency programmes. He recommended keeping programmes simple, starting small and expanding them dramatically, addressing all barriers to energy efficiency, measuring progress, and ensuring that everyone can benefit from the programme.