International Energy Agency (IEA), 2016.

"Often called the "first fuel" of the global energy system, energy efficiency is one of the most important steps that any government can take to move towards a sustainable energy system.. To check on the progress made on this front, the IEA Energy Efficiency Market Report tracks the core indicators of energy efficiency. This year, the report takes a new approach and expands the scope of analysis by examining the drivers of energy efficiency programmes in emerging economies, as well as the impact of those policies."