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General Question: What is a kilowatt hour?

Answer: The kilowatt hour, also written kilowatt-hour (symbol kWh, kW h or kWh) is a unit of energy equal to 3.6 megajoules.

Energy delivered by electric utilities is usually expressed and charged for in kilowatt hours.

Energy in kilowatt hours is the product of power in kilowatts and time in hours; it is not kilowatts per hour.

The unit of energy in the International System of Units (SI) is the joule (J), equal to one watt second (one watt is equal to one joule per second); one kilowatt hour is exactly 3.6 megajoules, which is the amount of energy expended (or dissipated) if work is done at a constant rate of one thousand watts for one hour.

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