and the European Union. ISO 50001:2011 Energy management systems – Requirements with guidance for use was published on June 17, 2011. ISO published a revised version of ISO 50001 in 2018. The revision reflects a desire to promote adoption of the standard among small and medium sized enterprises. It also incorporates ISO's "high level structure" for use where organizations wish to integrate a number of management system standards together. Structure The structure of ISO 50001 is designed according to other ISO management system standards, in particular ISO 9001 (Quality Management Systems) and ISO 14001 (Environmental Management Systems). Since all three management systems standards are based on the plan–do–check–act (PDCA) cycle, and now share the same high level structure, ISO 50001 can be integrated easily to these systems. There are ten major components to ISO 50001:2018: 1.: Scope 2.: Normative references 3.: Terms and definitions 4.: Context of the organization 5.: Leadership 6.: Planning 7.: Support 8.: Operation 9.: Performance Evaluation 10.: Improvement Method ISO 50001 provides a framework of requirements that help organizations to: develop a policy for more efficient use of energy fix targets and objectives to meet the policy use data to better understand and make decisions concerning energy use and consumption measure the results review the effectiveness of the policy and continually improve energy management. ISO 50001 focuses on a continual improvement process to achieve the objectives related to the environmental performance of an organization (enterprise, service provider, administration, etc.). The process follows a plan–do–check–act approach. Plan: The overall responsibility for the installed energy management system must be located with the top management. An energy officer and an energy team should be appointed. Furthermore, the organization has to formulate the energy policy in form of a written statement which contains the intent and direction of energy policy. Energy policy must be communicated within the organization. The energy team is the connection between management and employees. In this phase the organization has to identify the significant energy uses and prioritize the opportunities for energy performance improvement. Do: The stated objectives and processes are now introduced and implemented. Resources are made available and responsibilities determined. Make sure that employees and other participants are aware of and capable of carrying out their energy management responsibilities. The realization of the energy management system starts. Check: An energy management system requires a process for compliance and valuation of energy-related regulations. Internal audit