What is meant by the Energy Management System (EnMS)?
Energy Management System (EnMS) is often interpreted differently. Some professionals consider an energy data analysis system or a building energy management system for equipment operational efficiency as EnMS which is not the case. The energy data analysis system or the building energy management system can be a part of an overall Energy Management System but it is not an energy management system on its own. The term energy management is a wider term that encompasses BEMS, EMIS and lot of other management elements within it.
 
BEMS
 
The building energy management system is often referred to as BMS/BEMS. 
 
EMIS
 
The analysis and monitoring system for energy is known as Energy Management Information System (EMIS). 
 
EnMS
 
EnMS is a management system that empowers organizations to plan, review, improve, and identify for the energy consumption patterns in an organization.