The move to turn the clocks forward by an hour on March 11 rather than the usual early April date was mandated by the U.S. government as an energy-saving effort.

But other than forcing millions of drowsy American workers and school children into the dark, wintry weather three weeks early, the move appears to have had little impact on power usage.

"We haven't seen any measurable impact," said Jason Cuevas, spokesman for Southern Co., one of the nation's largest power companies, echoing comments from several large utilities. ...