ACEEE, May 29, 2014, by Christopher H. Russell.
http://aceee.org/blog/2014/05/fully-measuring-non-energy-dollar

"ACEEE is now building on earlier research to quantify the dollars provided by non-energy benefits. The ideal outcome is to amass sufficient data from past energy improvements to statistically infer non-energy benefits. We think this effort will require the collaboration of multiple utility jurisdictions, culling through the project feasibility data generated by past and future energy programs."