Current market overview of energy management software. An energy management system (EMS) is a system designed to monitor, control and optimize energy consumption in a company, organization or building. The main objective of an EMS is to improve energy efficiency, lower costs and reduce environmental impact. ISO 50001 is a globally valid standard that formulates requirements for energy management systems. Such an energy management system records all energy flows in organizations (companies, authorities) and is intended to help improve energy efficiency and thus reduce consumption.