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What is one unit of electricity?

By becoming energy aware at home, you can save money and help combat climate change. The first step to saving energy is knowing how much you use in the first place.

How we measure electricity

The basic unit of electricity is the Kilowatt hour (kWh). In simple terms, 1 kWh is the amount of energy consumed by an electrical device (e.g. an electric heater) that is rated at 1kW (1000 watts) for 1 hour. A further example is ten 100-watt light bulbs used for 1 hour.

Identifying which appliances use the most electricity in your home means that you can control the amount you spend on electricity. As a guide, the diagram below shows how long you can use various appliances for the price of one unit of electricity.

To help you estimate how much your home electricity appliances cost to run, take a look at our Appliance Calculator.

What can one unit buy you?

What can one unit buy you?

How much is it costing me?

Try our energy appliance calculator to work out how much money your household appliances use - and find out ways you could save.

Find out more

  1. See how you can save on energy costs with our energy saving wizard.
  2. Take a 3D tour of home energy efficiency in our energy efficient house.