We use estimated readings because we need to bill you for the amount of energy you’ve used up to the exact date of your statement. The only time that estimates wouldn’t be used is when you submit your meter reading on exactly the same day that your statement is generated.
For the estimated readings, our system works out how much energy you used each day between the first estimated reading and your own meter reading. Then it calculates what reading you would have reached on the day we issue your statement, if you’d carried on using gas or electricity at exactly the same rate each day. So, for instance:
We issue a gas statement for the period ending 1 October at a reading of 8,000.
On 25 October you give us a reading of 8,025, so you’ve used 1 unit a day over those 25 days.
Your next statement covers the period up to 31 October, so for those extra 6 days we add on another 6 units.
If you’ve got a smart meter and you chose for it to send us meter readings ‘once a month’ or ‘once a day’, we’ll only base your statement on estimated readings if we’ve lost communication with your smart meter. If you think your smart meter might have lost connection, you can follow our
smart meter troubleshooting steps to find out how to get everything working again.
Unit rate, price per kWh
The cost of your energy per kilowatt hour and how many kWh you’ve used in this billing period. For gas meters, you’ll also see the meter units you’ve used, which are then converted into kWh to make them easy to compare.
The total cost for the electricity and/or gas used before VAT is added.
How much you pay for us to supply energy to your home for this billing period. It’s a fixed daily price multiplied by the number of days.
This details your Meter Point Reference Number (MPRN), Meter Serial Number (MSN), your tariff, charge period, the meter readings we used and the cost of your gas.
Explaining your gas statement
Explains in detail how we work out how much gas you use. All suppliers use the same formula.
Understanding your gas formula
The number of units used between the two meter readings.
Volume conversion factor
This is different depending on the type of meter you have:
Imperial - 2.83
Metric - 1
This corrects the volume of gas to account for temperature and pressure, this is a regulated figure. Calorific value This figure is then multiplied by the calorific value of the gas which is a measure of the available heat energy. Calorific values vary and the figure is quoted on your bill.
Convert to kWhs
Again, this factor is regulated and is the figure used to convert to kWh.
The actual number of kWhs used during the billing period, which is then used to calculate how much money your energy usage costs.
If we have more than 1 reading during the statement period
We’ll take the number of gas meter units used between the two meter readings, then follow the calculation above to work out how many kWhs you’ve used. We’ll do this calculation for as many readings we have during the statement period.
If you gave a reading on the 15th of the month and you’d used 38 units of gas we will do this calculation using 38 units of gas.
Then if you gave a reading on the 31st of the month and you’d used 26 units we’ll use this figure to calculate the number of kWhs used.
We’ll then round both consumption figures, add them together and then round them once more.
If you’ve had a new meter fitted during your statement period
If you’ve had a new meter fitted, it’s likely to change from an older imperial meter that measures in cubic feet to a newer metric meter, that measures in cubic metres. To work out how many kWhs you’ve used during this period we’ll need to apply a different Volume Conversion Factor to the calculation. We’ll follow this calculation for both types of meters.
The first calculation will be meter units used whilst the meter was metric and one will include the meter units used whilst the meter was imperial. They will both then be rounded, summed and rounded once more to calculate your usage for this period.
The Calorific value varies throughout the year and may be different per meter reading.
Send us your meter readings
Lets you know how to submit meter readings to keep your statements super-accurate.
Explains what to do and who to call if you ever smell gas.
Your gas distribution
Explains how your gas is supplied.
Contacting your local electricity network
If your power goes down, or you have to move the meter or upgrade your supply, you need to contact your Local Network Operator. This section gives you their contact details.
Our energy sources
Our energy comes from a variety of sources, like natural gas, and this section shows you the percentages of each compared to the national average.
Points you in the right direction for free and independent advice on energy and your money.
Should you ever want to make a complaint about OVO, this section tells you exactly what to do.
Then it will also include the Tariff Comparison Rate:
Tariff Comparison Rate
The Tariff Comparison Rate (TCR) was an energy industry standard designed to help you compare your energy plan with other providers. It included your plan name, how you paid, when it ended, and your estimated annual consumption (which means how much energy we expected you to use in a year). It also showed the exit fees you’d have to pay if you left before your plan ended. It was only used for comparing average consumption.
A standing charge is a daily fixed charge that goes towards the cost of supplying energy to your address. It includes the cost of the pipes and power lines, and maintenance of your meters. You pay your standing charge no matter how much energy you use – even if you have a smart meter.
Under ‘My plan’, look for the number that comes before ‘p/kWh’.
You can also check out our
unit rate table this also includes our standing charges. However, if you fixed your prices a while ago, these rates may not be the same as the ones you’re paying. That’s why it’s better to check your welcome letter or My OVO.
A Tariff Comparison Rate (TCR) was once used to help you compare OVO prices against other suppliers’ offers. It was introduced by Ofgem, then withdrawn in 2017. You would have seen it as a section on your bill showing a breakdown of what the average medium user spends based on the plan you chose.
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