Energy efficiency, or the improvement of energy productivity of real assets across end-user groups, is an essential part of the global transition towards clean, secure, and affordable energy systems. Being one of the most effective strategies for reducing greenhouse gas (“GHG”) emissions, energy efficiency is forecast to deliver close to 30% of the total reduction in GHG emissions needed to limit global warming to well below 2° Celsius from pre-industrial levels1 (IEA, 2021b).