Complaints

How to Dispute an Energy Bill With Your Energy Supplier

Follow the right complaint process to resolve energy supplier disputes.

How to Complain to Your Energy Supplier

Energy supplier complaints

Energy suppliers must offer a formal complaints process. You can use it for problems with bills, tariffs, payments or service.

Start with the correct procedure. Also, keep everything in writing. This can make an energy bill dispute much easier to resolve.

Suppliers should aim to resolve complaints within 8 weeks. After that, eligible unresolved cases can usually go to the Energy Ombudsman.

Step 1: Make a formal complaint in writing

A phone call can help raise the issue. However, always use your supplier’s formal complaints process too.

Email the complaints team where possible. Explain clearly:

  • What happened

  • When it happened

  • How it affected your energy bill or account

  • What you want the supplier to do

Next, keep copies of everything. Save your emails, bills, meter readings and replies.

These records can support you later. In particular, they can help if you need to escalate an energy supplier complaint.

📧 Template complaint email
"I am writing to make a formal complaint about [issue]. My account number is [X] and my address is [Y]. [Describe what happened]. I would like [specific resolution] within 14 days. Please acknowledge receipt."

Step 2: Escalate to the Energy Ombudsman

If your energy supplier complaint is still unresolved after 8 weeks, or your supplier sends you a deadlock letter, you can take the complaint to the Energy Ombudsman. The service is free for consumers and they can investigate disputes about energy bills, accounts, tariffs and customer service. The Ombudsman can require suppliers to take action, such as correcting an account or making a payment, with decisions binding on the supplier when accepted.

✅ Energy Ombudsman
ombudsman-services.org/energy · Free · Decisions legally binding on suppliers

The energy back-billing rule

Energy suppliers generally can’t charge you for energy used more than 12 months ago when the supplier is at fault for failing to bill you correctly. If you receive a large backdated energy bill, check whether the 12-month back-billing rule applies, as you may not have to pay charges relating to the older period.