Business Energy, June 2014, by Dan Rafter.
http://www.businessenergy.net/DE/Articles/Plugging_the_Energy_Drain_25978.aspx

"EMS—especially networked ones that allow, say, lighting systems to talk to HVAC systems—can dramatically reduce the amount of energy that the typical office building consumes. Add this to the fact that so many today lack these systems, and it’s clear that the energy management industry should be in definite growth mode today."