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On Monday, CBS had Daniel Sieberg, its technology correspondent, warn us about the looming onset of Daylight Savings Time. This year the clocks move earlier than usual, so Sieberg warned us that many digital consumer devices have not been programmed to make the change. Now ABC's Ned Potter (subscription required) examined the rationale behind saving that daylight earlier. The theory is that if sunset occurs at a later hour, households will use less electricity in the evening. It is based on 30-year-old research that found that people rarely rise before dawn. Since then, Potter pointed out, more commuters are waking earlier, so any energy saved by a later sunset may be consumed before sunrise instead.
So the switch may not save any energy--and reprogramming all those digital devices by hand may cost $2bn economywide.
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