How we show your energy use on a graph

You’ll find graphs showing a breakdown of your energy use in £ or kWh by tapping ‘Usage’ in the sidebar. If you don’t think your graphs look ‘quite right’ here’s how we work out and show your energy use.

How we calculate your energy use

We use the meter readings that you (or your smart meter) send us to calculate how much energy you’ve used. And, where we don’t have actual readings, we use estimated readings which you can find on your bills. The more often you send readings, the more accurate your graphs will be. How your graph appears depends on how often you send readings:

1. If you have a traditional meter and you send us readings manually

We work out how much energy you’ve used between your meter readings and split this into daily amounts. We can do this even if there are longer gaps between your readings.

Here’s an example:

*On 12th February, you sent a reading of 4600kWh

*On 23rd March, you sent a reading of 5000kWh

*On 12th May, you sent a reading of 6000kWh

*This shows you used 400kWh in the 40 days between 12th February and 22nd March – which works out at 10kWh a day

*And you used 1000kWh in the 50 days between 23rd March to 12th May – which works out at 20kWh a day

So – March’s graph will show that you used 10kWh each day from 1st–22nd March, and 20kWh a day from 23rd–31st March. That’s 400kWh across the whole month

The best way to make sure your graphs show the most accurate breakdown is to send us readings each month, ideally on the date we usually bill you.

Even better – get a smart meter to do it for you! Once you've got one you'll be able to automatically send readings every day or half hour, which makes your bills more accurate and your graphs more up-to-date! That's not all. With a smart meter, you’ll be able to unlock Energy Spotlights: personalised tips that help you cut energy waste at home. They're part of our carbon-kicking upgrade, OVO Beyond.

Book a smart meter appointment

2. If you have a smart meter:

a. If your smart meter is inactive and you send readings manually

When we don’t get daily readings from you, we’ll add up how much energy you’ve used between your meter readings and split it into daily amounts. We can do this even if there are longer gaps between your readings.

Here’s an example:

*On 12th February, you sent a reading of 4600kWh

*On 23rd March, you sent a reading of 5000kWh

*On 12th May, you sent a reading of 6000kWh

*This shows you used 400kWh in the 40 days between 12th February and 22nd March – which works out at 10kWh a day

*And you used 1000kWh in the 50 days between 23rd March to 12th May – which works out at 20kWh a day

So – March’s graph will show that you used 10kWh each day from 1st–22nd March, and 20kWh a day from 23rd–31st March. That’s 400kWh across the whole month

Sometimes smart meters can become inactive from time to time, this usually resolves itself so there’s no need to worry. As soon as we get a reading from you we’ll update your account with your accurate energy use. If yours is an inactive first-generation (SMETS1) smart meter from another supplier, it’s easy to get a brand new SMETS2 to send automatic readings.

Book a smart meter appointment

b. If your smart meter sends automatic monthly readings

When we don’t get daily or half-hourly readings from your smart meter, we’ll add up how much energy you’ve used between your meter readings and split it into daily amounts. We can do this even if there are longer gaps between your readings.

Here’s an example:

*At midnight on 1st May your meter sent a reading of 4500kWh

*At midnight on 1st June your meter sent a reading of 5000kWh

*This shows you used 500kwh over the 31 days of May

*We show this on your May graph as 16kWh a day

Please call us to update your smart meter reading preferences to daily or half-hourly. That way your graphs will be more accurate, and you can tap any day’s use for a more detailed breakdown.

c. If your smart meter sends automatic half-hourly or daily readings

Well done you! This means your graphs show your most up-to-date and accurate energy use.

Here’s an example:

*At midnight on 4th June, your smart meter sent a reading of 4300kWh

*At midnight on 5th June, your smart meter sent a reading of 4310kWh

*This shows you used 10kWh on 4th June

*We add this day to June’s energy-use graph

*June’s energy use so far will update in the current year’s graph

*If your smart meter sends half-hourly readings you can tap any day in June for a detailed breakdown


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