Part of the justification for extending Daylight Saving Time (DST) in the United States was a reduction in energy costs by adding more daylight in the evening hours when citizens are home watching TV and otherwise being sloth-like and inactive (sorry, a little anti-TV prejudice eeking out). The legislation foresaw energy savings as much as 1% (a large number when averaged over all households and businesses in the country).
However, a recent study by two doctoral students at the University of California Energy Institute suggests that energy savings may be at best overstated and at worst nonexistent. Examining a DST-extension that took place surrounding the Olympics in Australia, the two students found that most models of energy savings vastly overstated the actual changes in energy use.
While DST extensions might not save energy, I'm definitely enjoying my "extra" hour of daylight in the evenings. Sunset today: 7:16pm!
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