document: Control centers are here to stay Despite changes with different structures , market rules , and uncertainties , a control center must always be in place to maintain the security , reliability , and quality of electric service . This article focuses on the energy management system -LRB- EMS -RRB- control center , identifying the major functions that have become standard components of every application software package . The two most important control center functions , security control and load-following control , guarantee the continuity of electric service , which after all , is the end-product of the utility business . New technology trends in the design of control center infrastructures are emerging in the liberalized environment of the energy market . An example of a control center infrastructure is described . The article ends with a concern for the security of the control center itself
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