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A megajoule is 1/3.6 of a kilowatt-hour so it costs about $0.05.
But how much does electric energy cost? Although different people have different electricity rates, I am going to go with a price of 10 cents per kilowatt hour. If you do some simple conversions, this is 2.78 x 10 -8 dollars per Joule.Now I can write an expression for the cost (C) as a function of mass of ice.This says that to make 1 kilogram of ice, you would need to spend 1.26 cents for the electricity.ow I can write an expression for the cost (C) as a function of mass of ice. This says that to make 1 kilogram of ice, you would need to spend 1.26 cents for the electricity.