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A megajoule is 1/3.6 of a kilowatt-hour so it costs about $0.05.
Yes, this is a unit of energy and not power. It says that you could get a power of 10 kilowatts for 1 hour. You can convert this energy to Joules if you like â it would be 3.6 x 10 7 Joules (1 watt is a Joule/second). The next thing we need to calculate the run time is the power.