energy units


The watt (W) is the basic unit of measuring power – it’s the rate at which an appliance is consuming energy at given time. Electrical appliances and lighting all draw a certain number of watts to operate.

A watt-hour (Wh) is one watt of power used for one hour – the accumulated consumption over a period of time. The following terms are used for multiples of these units:

kilowatt kw 1,000 watts
kilowatt hour kWh 1,000 watts used for one hour
megawatt MW 1,000 kilowatts or 1,000,000 Watts
megawatt hour MWh 1,000 kilowatt hours or 1,000 kilowatts used for one hour

You pay for electricity usage in kilowatt hours (kWh).



Gas consumption is calculated in joules.

The following terms are used for multiples of this unit:

MJ megajoule 1 million joules
GJ gigajoule 1,000 megajoules

Your gas account will show your gas consumption in MJs.

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