- The standing charge is fixed daily and explains why a low-usage home still gets a bill.
- Check whether readings are actual or estimated — the letter E means estimated.
- Billing errors are common and suppliers generally cannot back-bill beyond twelve months.
Energy bills are written to satisfy regulators rather than to be understood. Most people check the total and file it. But billing errors are common, and the only way to catch one is to know what the numbers mean.
The two charges
Every energy bill has exactly two components per fuel.
The standing charge
A fixed daily amount you pay regardless of how much energy you use. It covers the cost of maintaining the network connection, meter reading, and various industry costs.
It is charged every single day, including days you are away. This is why a nearly empty flat still generates a bill, and why “use nothing, pay nothing” is not how it works.
Standing charges vary by region and have risen substantially in recent years. Check yours — it is quoted in pence per day, so multiply by 365 to see the annual cost.
The unit rate
What you pay per kilowatt-hour (kWh) of energy actually used. Multiply your consumption by this rate and you have the usage part of the bill.
Some older tariffs have two tiers, or separate day and night rates (Economy 7 and similar). If you have one of those, check that the split still suits how you live — the night rate is only worth having if you genuinely use a lot of electricity overnight.
Reading the meter section
This is where errors hide. The bill will show an opening reading, a closing reading, and the difference as your consumption.
Look for a letter next to each reading:
- A or “Actual” — a real reading, either yours or from a meter reader.
- E or “Estimated” — the supplier guessed, based on past usage.
- C or “Customer” — a reading you supplied.
- S — from a smart meter.
A run of estimated readings is the single most common cause of billing problems. If your actual usage is lower than the estimate, you are lending the supplier money. If it is higher, a large catch-up bill is building quietly.
Submit a real reading before each bill. It is the simplest protection there is. Photograph the meter each time.
Checking your direct debit is right
A monthly direct debit is meant to spread a year’s cost evenly. Suppliers review it periodically and adjust.
Two things to check:
- A large credit balance. Some seasonal credit is normal — you build it in summer to cover winter. But a balance still growing in spring means your payments are too high. You can ask for the surplus to be refunded, and suppliers generally must return it on request.
- A growing debit balance. The opposite problem. Better to increase payments gradually than face a correction later.
The sensible check is once in autumn and once in spring.
Common errors worth looking for
- Wrong meter. Check the meter serial number on the bill matches the one on your meter. Crossed meters between flats and neighbouring properties are not rare.
- A previous occupier’s usage. Check the opening reading on your first bill matches what the meter said the day you moved in. Always photograph the meter on moving day.
- The wrong tariff. Check the tariff name on the bill is the one you agreed. Ending a fixed deal without noticing rolls you onto a standard variable tariff.
- A digit dropped or added. Compare consumption with the same period last year. A tenfold jump is an error, not a lifestyle change.
- Dial meters read wrongly. On older dial meters, read left to right, and where a pointer sits between two numbers take the lower one. If a pointer is exactly on a number, check the dial to its right to decide.
- VAT. Domestic energy is charged at the reduced rate. If you are being charged the standard rate on a domestic supply, query it.
The back-billing rule
If a supplier failed to bill you correctly, it generally cannot charge you for energy used more than twelve months before the error came to light. This protects people who receive a sudden bill covering several years.
The rule does not help if you obstructed readings or were told about the issue and ignored it. But if a large historic bill appears out of nowhere, raise back-billing explicitly in writing.
If something looks wrong
- Take a photograph of the meter today, with the serial number visible.
- Contact the supplier and ask them to explain the calculation. Get a reference number.
- Keep paying what you can meanwhile — a disputed bill is better handled from an account in good standing.
- If unresolved after eight weeks, or on receipt of a deadlock letter, escalate free to the Energy Ombudsman.
- Citizens Advice runs the consumer service for energy and can help you argue it.
Rates, VAT treatment and rules change — check current details with your supplier and Ofgem.
