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The terajoule (TJ) is equal to one trillion (1012) joules; about 0.278 GWh (often used in energy tables).
The gigajoule (GJ) is equal to one billion (109) joules. 6 GJ is about the chemical energy of combusting 1 barrel (160 l) of crude oil. 2 GJ is about the Planck energy unit.