Energy efficiency appears to be the cornerstone for the development of sustainable and competitive industries. Reducing emissions, of course, but not only that... this industrial transition shall also cover the issues of flexibility, pace of replacement, synergies or digital impacts, as well as cultural and organizational specificities. Industrial players, grid operators, solution providers, contractors and utility companies... a cross-functional approach is essential to manage projects and decarbonize applications and processes. What is the best approach? How can we accelerate our transition towards an increase in energy efficiency?