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The kilowatt hour (SI symbol kWh, kW⋅h or kW h) is a derived unit of energy equal to 3.6 megajoules.
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.