Sources: U.S. Energy Information Administration: Annual Energy Review 2009.
List Notes: Data is commercial building electricity consumption by end use in North America for the year 2003. The British thermal unit (Btu) is a traditional unit of energy equal to about 1 055.05585 joules. It is approximately the amount of energy needed to heat 1 pound (0.454 kg) of water 1 degree F (0.556 C).