The new ISO 50001 standard helps you deploy the right tools to ensure that the promise of saving so much energy by year N is kept. It comes at just the right moment to lend credibility to an energy-saving scenario, and thus remove the obstacles to financing the work that is supposed to generate it. Local authorities and all organizations looking for funding will appreciate it! On this point, the new version of the text has benefited from the contributions of earlier international standards on energy performance measurement and verification (ISO 50006, ISO 50015 and ISO 17741), themselves inspired by the international IPMVP protocol.