For years I have said that daylight savings time likely made no sense as an energy saving program. It was first used back in World War I, when electricity demand was primarily driven by illumination. At that time, shifting the clock around to better match working hours with sunny hours (ie times with natural light) probably did save electricity. But today, electricity demands are driven much more heating and cooling. The same logic no longer holds. In Arizona, the earlier the sun goes down, the less electricity we have to use when we are home in the evenings to keep the house cool.
The result of the study showed that electricity use went up in the counties adopting daylight saving time in 2006, costing $8.6 million more in household electricity bills. The conclusion reached by Kotchen and Grant was that while the lighting costs were reduced in the afternoons by daylight saving, the greater heating costs in the mornings, and more use of air-conditioners on hot afternoons more than offset these savings. Kotchen said the results were more "clear and unambiguous" than results in any other paper he had presented.
Of course, daylight savings time will never go away, because modern environmentalism has become more a matter of making empty feel-good gestures than performing rational acts that actually improve something.