GTOE is an abbreviation for "gigatonne of oil equivalent", a common measure of global energy. A billion tonnes of oil contains roughly 10,000,000,000,000,000,000 calories (as in the energy to heat one gram of water one degree Celsius, not "Calories" as in the food measurement —also known as the kilocalorie) or 41.868 EJ (exajoules) or 11.63 PW·h (petawatt-hours). As of 2003, the world uses roughly 9 GTOE (380 EJ) worth of energy per year, from all energy sources combined with an annual growth rate of roughly 3%.
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