Demonstrating continual operational cost savings is at the core of a mix of incentives, voluntary and market based energy performance enhancements proving that both behavioral (how we engage equipment and controls) and engineering projects (HVAC, windows, Emis) make sense. “One without the other is like a fish without water,” said Don Macdonald.

http://www.forbes.com/sites/heatherclancy/2014/12/30/in-california-at-least-the-case-for-energy-efficiency-is-building/