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A megajoule is 1/3.6 of a kilowatt-hour so it costs about $0.05.
So anybody who does talk about energy, rarely speaks in Joules. We instead multiply power back by time again and have the unit, the kilowatt-hour. A kilowatt, a thousand Joules/second, times 3600 seconds in an hour, is 3,600,000 Joules - 3.6 megaJoules (MJ).e all know the Watt is a unit of power consumption and have an idea how quickly a 1500 Watt kettle boils water. The unit of energy is the Joule - a Watt is just a flow of one Joule per second. The other popular unit of power is the horsepower.