Energy bills can be difficult to understand, with even simple things like how much you're paying seemingly hidden.
YouGov research on behalf of uSwitch found 75% of people find energy bills confusing, and only 4 in 10 could understand the calculations on their bill.
"Cut out all the jargon - just tell me what I've used and how much it costs."
We've got a full energy bill breakdown, listing all the key parts of your bill and what they mean for you. There's also a video which will lead you through the maze, and a jargon buster to help tell your MPAN's from your MPRN's.
Energy bills explained
We've put together this gas and electricity bill based on a number of energy bills from different suppliers, but please remember that your bill might not look like this one. Also keep in mind that you might pay for your energy in two parts and might receive separate electricity and gas bills.
1. Any contact details you need to get in touch with your energy supplier will be provided.
2. You'll usually find your customer reference number or account number on the front of your gas and electricity bills. This is your unique identifier should you need to contact your supplier.
3. This is the date your bill was issued
4. The bill period shows you the dates that your energy bill relates to.
5. This is the date and amount of the last payment you made to your energy supplier .
6. This is the total cost of the energy you've used in this period before VAT is added.
7. VAT at a standard level of 5% (and not the usual 15%) will be added to your electricity and gas bills here.
8. This is the final total of your bill and is the amount you need to pay your energy supplier.
9. Any additional information that your supplier wishes to show you will often appear on the front of the gas and electricity bills.
10. Your electricity supply number will appear in this box format - however it will often appear very small so you might need to look for it carefully.
11. This is your meter point reference number , which you will need if you choose to switch your gas plan . This is sometimes referred to as an MPRN. It will usually be between 6 and 10 digits long.
12. Your current plan name will often be shown on your bill - but if it isn't displayed, you may need to contact your supplier to find out what it is.
13. A detailed breakdown of your energy usage is provided, including the kilowatt hours (kWh) used, the cost per kilowatt hour and your latest meter readings . You can also find out here if your meter readings are estimated or actual and the dates your readings were taken or estimated.
14. You'll be given a contact number to call if you have any specific requirements such as large print or braille bills.
15. A payment slip will be provided if you wish to pay your electricity or gas bills at the bank or by post.
For further information about what any of these terms mean, check our energy bills jargon guide for full details.
Energy bills explained video
Energy bills jargon buster
Our glossary lists all the terms you're likely to find, either on your bills or across our site. Simply click on the term you need explained and we'll tell you what it all means.
- Account number
- Calorific Value (CV)
- Dual Fuel
- Economy 7
- Economy 10
- Estimated (E) or actual (A) readings
- Fixed Monthly Direct Debit (MDD)
- How to convert units to kWh
- IGT Network/charges
- Kilowatt hours (kWh)
- Loyalty points
- Meter point administration number (MPAN)
- Meter point reference number (MPRN)
- Metric conversion factor
- NSC - No Standing Charge
- Plan/tariff name
- Standing charges
- Standing Order
- Supply number
- Variable Direct Debit (VDD)
- Volume correction factor
Your account number refers to the account you hold with your energy supplier. This number will be printed on your bill and you will be asked to provide it when you contact your energy supplier.
Calorific Value (CV)
'Calorific Value' (CV) is a scientific term used to describe how much heat is generated when a known volume of gas is completely burned away.
Gas passing through the National Grid has a CV of 37.5MH/m3 to 43.0MJ/m3, but the CV for your specific area should be displayed on your gas bill.
Put simply - the CV measures how 'useful' your gas is, so your supplier can charge you based on the quality of the gas that is supplied to you.
For more information on calorific values and how they're calculated, please refer to the National Grid website.
If you have any discounts applied to your energy bills, they should be marked clearly near the final total. There is a large range of discounts available (common examples include dual fuel discounts and direct debit discounts), so if you're not sure which discounts you're entitled to, you can run through our energy calculator and check your current plan details or contact your energy supplier for more information.
Dual fuel is where you receive your gas and your electricity supply from the same energy company. Read more about dual fuel.
Economy 7 is a type of electricity tariff that uses different prices for the electricity you use during the day and the electricity you use during the night.
Typically the electricity you use at night will cost you less than electricity used during the day. With Economy 7, the 'night' usually refers to the early hours, between around 1am to 8am, but these hours can vary between suppliers. Read more about Economy 7.
This structure gives you three off-peak hours in the afternoon, two in the evening and five hours overnight. The designated hours will change between suppliers. Unfortunately we cannot support economy 10 switching on uSwitch.
Read more about economy 10 tariffs here.
Estimated (E) or actual (A) readings
If your meter reading has been estimated - then your energy supplier has assumed your usage for the period in question, based on your energy usage patterns in the past.
If they don't hold this information, they will use national average figures. If you've had a meter reading recently, then your usage will be marked as 'actual' and not estimated.
This isn't always obvious - and might only be denoted by a capital 'A' for 'actual' or 'E' for 'estimated'.
Not sure how to take a meter reading? Read our guide on taking a gas or electricity meter reading.
Fixed Monthly Direct Debit (MDD)
If you hold a monthly direct debit with your supplier, then you will pay a set amount to your supplier every month. However this does not mean that your energy prices are fixed.
Your energy supplier needs to give you notice if they intend to change the amount of the monthly direct debit.
How to convert units to kWh
On your energy bill, your gas units will be converted to kilowatt hours. Please note that the Calorific Value will change depending on your area - so please check your bill for the correct figure.
Use the following formula to convert units to kWh:
This works for meters that record hundreds of cubic feet where your gas meter shows 'ft3' next to the reading. If your meter measures in cubic meters with an 'm3' next to the reading, then go through the same sum while removing the metric conversion factor of 2.83.
Example for meter that records hundreds of cubic feet:
IGT stands for 'Independent Gas Transporter'. If your home is supplied by an Independent Gas Transporter Network, it means that it is not connected to the National Grid, which supplies most of the UK's home's with gas.
You will often find an extra charge applied to your bill if you are supplied by an IGT network, due to the extra costs involved in having your gas delivered.
If your MPRN number is 10 digits long and begins with 74 or 75 then you are supplied by an IGT.
Kilowatt hours (kWh)
A kilowatt hour is the standard measurement of energy that your energy supplier will use to bill you. A kilowatt hour refers to a person using 1000 watts of electricity for 1 hour. Your prices will be set per kilowatt hour (kWh) of energy you use.
Loyalty points will only apply to certain tariffs, and can come in different formats. These can include things like Sainsbury's Nectar Points and Tesco Clubcard points, which can be earned on energy bills with suppliers that have a commercial arrangement with specific supermarkets. The number of points you've accrued should be displayed clearly on your bill.
Meter point administration number (MPAN)
Your meter point administration number will often be referred to as your MPAN or your supply number. It can also be referred to as your 'S' number. This number is assigned to the electricity meter at your property to identify it, and can be found on your electricity bill. It is displayed in a very specific format as pictured below:
Meter point reference number (MPRN)
Your meter point reference number will often be referred to as your MPRN number. This number is assigned to the gas meter at your property, and can be between 6 and 10 digits long.
On your bill this number may be referred to as an 'M' number, but if you can't find it you can call the Meter Number Helpline on 0870 608 1524 for help.
Metric conversion factor
An imperial to metric conversion factor of 2.83 is used in the calculation to convert units into kilowatt hours (kWh).
NSC - No Standing Charge
If you plan name includes the abbreviation 'NSC' or the words 'No Standing Charge', then your supplier does not apply a fixed charge to your plan.
The name of your energy plan identifies which tariff you are on, which in turn dictates the prices you are charged. There are hundreds of different plans available in the market, and naming conventions will differ between suppliers.
Some energy plans include a standing charge, where a fixed charge is applied to your bill. This does not necessarily mean that the plan is more expensive than a no standing charge plan, as the kilowatt hour(kWh) rates can be lower.
If you hold a standing order with your energy supplier, you have arranged for a fixed amount to be sent from your bank account to pay your energy bill as often as necessary.
You have control of this payment method, so your energy supplier cannot change the payments at their end, even with your permission.
Your supply number can also be referred to as your MPAN or electricity meter point administration number.
Sometimes your gas and electricity prices are charged using different 'tiers' on your energy bills. This means that you get charged at one rate until you've used a certain amount of energy, and then at a different rate for any energy used over that level.
Although your gas will be charged according to kilowatt hours (kWh) used, your gas will initially be measured in units. This is then converted to kilowatt hours on your bill using a standard formula. Find out how to convert kWh's into units.
Variable Direct Debit (VDD)
If you have a variable direct debit set up with your energy supplier, then you are giving them control over the direct debit. They will amend the amount taken each month to pay off the outstanding bill, and they do not have to give you notice before changing the amount.
VAT will be charged on top of your total bill at a standard rate of 5% instead of the usual 17.5%. It is important to note that your gas and electricity bills will show all unit prices before VAT, whereas uSwitch is required to display all unit prices with VAT included. This allows us to make the most accurate and relevant comparison for you.
Volume correction factor
The volume correction factor of 1.02264 takes into account the changes in the volume of gas based on temperature and pressure.