The time change doesn't reduce energy use:
Here’s a raft of studies on the subject. Most of them find that while households do use less lighting during daylight saving, thanks to the longer, brighter afternoons, they also end up cranking up the air conditioning more, which makes it either a wash or a net loser for energy use. A 2008 paper (pdf) by economists Matthew Kotchen and Laura Grant examined what happened in Indiana when, thanks to a change in state law, all counties suddenly had to shift to daylight saving. They concluded that daylight saving probably costs Indiana about $10.7 million to $14.5 million per year in higher electricity bills and increased coal pollution.
The Dish 