This document provides an overview of ISO 50001:2018 and the transition from the original 2011 standard. It discusses key concepts like continual improvement in energy performance and management of change. It outlines the development timeline for ISO 50001 and important transition dates. The document reviews new clauses and requirements, including context of the organization, leadership commitment, energy planning, performance evaluation, and management review. It provides explanations of terms and definitions. The overall summary is that the document guides organizations on transitioning to the updated ISO 50001:2018 energy management standard.