2005 revision to dates of observance
By the
Energy Policy Act of 2005, daylight saving time (DST) was extended in the United States beginning in 2007.
[8] As of that year, DST begins on the second Sunday of March and ends on the first Sunday of November. These changes result in a DST period that is five weeks longer than previously in years where April 1st falls on Monday through Wednesday and four weeks longer than previously in years where April 1st falls on Thursday through Sunday.
[9] In 2008 daylight saving time ended at 2:00 a.m. DST (0200) (1:00 a.m. ST) on Sunday, November 2, and in 2009 it began at 2:00 a.m. (3:00 a.m. DST) on Sunday, March 8.
[10] Wyoming Senator Michael Enzi and Michigan Representative Fred Upton advocated the extension from October into November especially to allow children to go trick-or-treating in more daylight.[11]
Under Section 110 of the Act, the
U.S. Department of Energy was required to study the impact of the 2007 DST extension no later than nine months after the change took effect. The report, released in October 2008, reported a nationwide electricity savings of 0.03% for the year of 2007.
[12]
An October 2008 study conducted by the
University of California at Santa Barbara for the
National Bureau of Economic Research found that the 2006 DST adoption in
Indiana increased energy consumption in Indiana by an average of 1%. Although energy consumption for lighting dropped as a result of the DST adoption, consumption for heating and cooling increased by 2 to 4%.
The cost to the average Indiana household of the DST adoption was determined to be $3.29 per year, for an aggregate cost of $1.7 million to $5.5 million per year.[13]