American Council for an Energy-Efficient Economy (ACEEE), Research Report IE132, March 2014, by Christopher Russell. (Free registration required to view full-text.)
http://aceee.org/research-report/ie132

"Energy program administrators are sponsoring the placement of dedicated energy managers at industrial facilities to overcome the obstacles to energy optimization.  These pilot efforts seek to accelerate the pace and volume of industrial efficiency initiatives. This report describes five existing programs. The intent is to boost awareness of this program concept, which could be a critical component of future energy policy and program design."