Why is my energy bill so high?

The short answer

Separate how much energy you used (kWh) from what you pay for it (unit rates and standing charges) and from how you pay (your Direct Debit and account balance). A bill can look high because of any one of these, and the fix is different for each.

Our bill checker asks three questions and shows the three checks most worth doing first.

Check

What to check first

• Was the bill based on an estimate? The bill says whether it used an actual, smart or estimated reading. An estimate can be well above or below what you really used. Send a reading and ask for a corrected bill.
• How many kWh did you use? Compare the kWh on this bill with the same months last year, not with last month: most homes use far more energy in winter.
• What are your rates? Look at the unit rate (pence per kWh) and the standing charge (pence per day). If your fixed deal has ended, you may have moved to a different tariff.
• Is this a catch-up bill? If earlier bills were estimated too low, a real reading can produce a large one-off bill.
• Is it your payment, not your bill? A higher monthly Direct Debit is not the same as a higher bill. Check your account balance and how the amount was set.

How much energy is typical?

Ofgem's typical domestic consumption values give a sense of scale. For electricity in a home heated by gas, they are 1,600 kWh a year (low), 2,500 kWh (typical) and 3,800 kWh (high). For gas, the typical figure is 11,500 kWh a year.

These are benchmarks, not targets. Homes heated by electricity, larger or older homes, and homes with someone in all day can use much more without anything being wrong.

Estimated and catch-up bills

Ofgem's back-billing rule means suppliers cannot normally charge you for energy used more than 12 months ago if they did not bill you, or billed you incorrectly, at the time. The exception is where a customer has prevented accurate readings, for example by obstructing access to the meter.

If you receive a large catch-up bill, check the dates it covers and ask your supplier whether the back-billing limit applies.

Do

Practical next steps

1. Take meter readings today and photograph them with the date showing.
2. Use the meter reading calculator to check the kWh and cost since your last actual reading.
3. Compare your rates with the price cap for your region, and check when any fixed deal ends.
4. If your payment is the problem, use the Direct Debit check and ask your supplier how the amount was set.
5. If use really is high, see what your appliances cost to run, especially heaters, electric showers and tumble dryers.

If you cannot sort it out

Complain to your supplier first and keep a record. If the complaint is not resolved within eight weeks, or the supplier sends a deadlock letter, you can take it to the Energy Ombudsman free of charge. Citizens Advice can also help.

Take care

Important limitations

• The bill checker points to likely causes; it cannot see your account or meter.
• Ofgem's consumption figures are national averages and say nothing about whether your own use is wasteful.
• Rules can differ in Northern Ireland, which has a separate energy market.

Related tools and guides

• Bill checker
• Meter reading calculator
• Direct Debit check
• Energy bill calculator
• Is my Direct Debit too high?

Sources

• Ofgem: typical domestic consumption values
• Ofgem: back-billing limited to 12 months
• Citizens Advice: if your supplier increases your Direct Debit
• Energy Ombudsman

Official sources checked 2 October 2026.