Does ISO 50001 guarantee that promised energy savings will be achieved?

This is precisely the aim of the M&V work recommended in the new version of the standard. If, in addition, you involve design offices and service providers who are themselves committed to applying the standard properly, then yes, you’ll have more guarantees that the energy performance improvement curve promised to you on paper will coincide with what you actually see in reality. An energy management system based on the new ISO 50001 standard gives an even greater impetus to a culture of results over the long term. Not only is it based on the PDCA (plan, do, check, act) principle of continuous improvement, applying it to an easily quantifiable resource, but it also incorporates the latest best practices in energy metering and energy savings verification.