An Economy 7 meter records your usage on 2 rates – a day time rate and a cheaper night rate. So any electricity you use during a set 7 hour period at night typically costs about 48% of what it would during the day.

If you have an Economy 7 meter, you don’t have to have an Economy 7 tariff. If it works out best for you to be on a 24 hour single-rate tariff, we’d simply add your day and night units together to give us 1 single usage figure. So you won’t even need to change your meter.

But it’s worth looking into whether you could be better off on one our other Economy 7 tariffs, and planning when you use your electricity to make the most of the cheaper night time rate.

If you choose to move away from an Economy 7 tariff, you can always change back to an Economy 7 tariff at any time.

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To have an Economy 7 tariff, you will have an Economy 7 meter, a 2 rate meter that records your day and night electricity usage separately. It’ll give you a reading for each rate.

If it’s an older Economy 7 meter you’ll see both readings on the front. If it’s been installed quite recently, it’ll probably show you one or the other on an electronic screen – you’ll have to press a button to switch between your day and night readings.

Example of a two rate meter

2-rate meter with mechanical timeswitch

Example of a two rate digital meter

Electronic meter with single display

The night time hours when your electricity usage is on the Economy 7 cheaper rate will be a 7 hour period somewhere between 10pm and 8.30am - it depends where you live, and what type of meter you have. It may also change at different times of the year. For example - when the clocks go forward in spring, and when they go back in the autumn.

The best way to find out your exact Economy 7 hours is to look at your supply number, which you’ll find on your bill:

Diagram showing how to locate your electricity supply number

Take the first 2 digits of the example supply number above, and check against the map below. You’ll see that this customer’s night hours (in the London region) will be a 7 hour period somewhere between 23:00 until 07:00.

If you need more help please get in touch with us on 0800 073 3000 or 0330 100 3000 (view call charge information).

Map showing Economy 7 hours by region

In North Scotland, South Wales and the South West, each meter will have its own settings, but your night hours should be shown on your meter, or somewhere next to it.


To make sure an Economy 7 tariff is right for you, we recommend that you have electric storage heaters to heat your home, and use an immersion heater for your hot water.

Any electricity you use during the day will cost you more than it would on our standard single rate tariff. So if there are people at home using electricity during the day and you don’t have storage heaters or a hot water tank, then an Economy 7 tariff probably won’t be for you.

Gas heating

If you heat your home and water with gas, an Economy 7 tariff could still suit your lifestyle – so long as you use most of your electricity at night. For example, if you work shift patterns and are up during the night. Or if you don’t tend to use much electricity during the day.

Here are our top tips to help you get the most out of an Economy 7 tariff:

  • Heat your water economically overnight by using an immersion heater with a timeswitch controller
  • Economy 7 works well with storage heaters that are set to come on at night while you’re on the cheaper rate. This‘ll help keep your heating costs down
  • You’ll get the most benefit if your home is well insulated
  • Use plug-in or in-built timers to set your electrical appliances like washing machines, tumble dryers and dishwashers to come on overnight – while you’re on the cheaper rate

You can get an online quote or speak to one of our advisers, to see which tariff from our current range may be most appropriate for your needs, based on an estimate of your usage.

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Depending on where you live, we advise that you’d have to use at least 29% to 33% of your electricity during off-peak times for a credit meter and at least 15% to 19% for a prepayment meter for it to be worth having an Economy 7 standard tariff instead of a standard single-rate tariff.

This is based on a customer on our standard tariff with medium consumption of 4,300 kWh a year, as defined by Ofgem in its Typical Domestic Consumption Values. It will vary according to your actual usage, payment method and tariff.

Smart tip

Say goodbye to sending meter readings

If you get a Smart meter you won't have to read and send meter readings. Your Smart meter regularly reports back on your energy usage, so your bills will be more accurate (unless there's a problem collecting a reading).

Find out more about Smart meters

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Send us regular meter readings and we can give you more accurate bills.

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Set up meter read reminders

We can send reminders by email or SMS when it’s time to read your meter, so you don’t have to worry. And you get more accurate bills for every reading you send.

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