<Li> In Western Australia during summer 2006--2007, DST increased electricity consumption during hotter days and decreased it during cooler days, with consumption rising 0.6% overall . </Li> <Li> Although a 2007 study estimated that introducing DST to Japan would reduce household lighting energy consumption, a 2007 simulation estimated that DST would increase overall energy use in Osaka residences by 0.13%, with a 0.02% decrease due to less lighting more than outweighed by a 0.15% increase due to extra cooling; neither study examined non-residential energy use . This is probably because DST's effect on lighting energy use is mainly noticeable in residences . </Li> <Li> A 2007 study found that the earlier start to DST that year had little or no effect on electricity consumption in California . </Li> <Li> A 2007 study estimated that winter daylight saving would prevent a 2% increase in average daily electricity consumption in Great Britain . This paper was revised in October 2009 . </Li>

When is the start of daylight saving time