Of course it does
Daylight Saving Wastes Energy, Study Says, on WSJ.com.
We knew this. We just didn't want to listen.
Previously on the Ideapad:
"Extending DST won't 'save energy' just by keeping the sun up later. Lights will still need to run overnight on highways, city streets, and 24-hour facilities, and most stores won't change their operating hours." —July 19, 2005 (I missed air conditioning, but I'll take it)
See also Endless Summer in the New York Times, August 9, 2005 (previously linked here).