Utility Dive, Apr. 5, 2017, by Robert Walton.
http://www.utilitydive.com/news/report-efficiency-demand-response-spending-continues-to-rise-nears-9b/439566/

"Utilities continue to recognize the value of conservation and are spending more than ever on demand side management programs, with the bulk of that going into energy efficiency, according to a new report from the Consortium for Energy Efficiency (CEE). [Their] 11th Annual Industry Report finds energy efficiency and demand response program spending reached $8.7 billion in 2015, up 1% from 2014 levels. About 15% of the spending went towards natural gas programs, with the remainder on the electric side."