ACEEE Blog, Dec. 7, 2016, by Steven Nadel.
http://aceee.org/blog/2016/12/can-us-cut-its-energy-use-half-2050

"Yes, but we will have to double down on our efforts....We also thought it would be useful to look at potential savings in terms of cost-effective efficiency policies in order to more clearly outline what needs to be done to reach this 2050 goal. So today we release a new white paper with the results of our new analysis. These energy savings are important, because they can save the nation billions in energy bills, create domestic jobs, protect the environment, and yield numerous other benefits."