
An energy management system (EMS) is a system of computer-aided tools used by operators of electric utility grids to monitor, control, and optimize the performance of the generation and/or transmission system. The monitor and control functions are known as SCADA; the optimization packages are often referred to as `advanced applications`. The com.....
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http://en.wikipedia.org/wiki/Energy_management_system

A system in which a dispatcher can monitor and control the flow of electric power by opening and closing switches to route electricity or to isolate a part of the system for maintenance. It is also used to control the amount of generation needed to serve
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http://www.youngco.com/young2.asp?ID=4&Type=3

A control system capable of monitoring environmental and system loads and adjusting HVAC operations accordingly in order to conserve energy while maintaining comfort.
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https://www.encyclo.co.uk/local/20094

A system of computer applications used by building engineering staff to monitor, control, and optimize the building’s operating performance (e.g., energy consumption, occupant comfort levels). EMS optimizes building operating performance through supervisory control programs that utilize core BMS functionality. An EMS is a more refined definition ...
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https://www.fieldwire.com/resources/construction-glossary/
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