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The yottajoule (YJ) is equal to one septillion (1024) joules. This is approximately the amount of energy required to heat all the water on Earth by 1 °C. The thermal output of the Sun is approximately 400 YJ per second.
The kilowatt hour (SI symbol kWh, kW⋅h or kW h) is a derived unit of energy equal to 3.6 megajoules.