How to Complain to the Energy Ombudsman
The Energy Ombudsman settles disputes with gas and electricity suppliers once the supplier has had 8 weeks to put things right. It is free, and it takes disputes by post. Write your letter, and we print it and post it for you by Royal Mail.
From £2.49 including printing and postage
- No printer or Post Office trip
- See the finished letter before you pay
- Order by 2.30pm for same-day posting
Quick Answer
- Complain first to
- Your supplier
- The supplier has
- 8 weeks
- Then you have
- 12 months
- Cost
- Free
- Phone
- 0330 440 1624
A deadlock letter from your supplier lets you go to the Energy Ombudsman before the 8 weeks are up.
Where to Send It
Complain to your energy supplier first, at the address on your bill or its complaints page. If it does not sort it out, write to the Energy Ombudsman.
Energy Ombudsman
Registering a dispute, or sending evidence, by post.
Energy OmbudsmanPO Box 966WarringtonWA4 9DFYou can also register a dispute online, by email to enquiry@energyombudsman.org, or by phone on 0330 440 1624, Monday to Friday 8am to 6pm.
Write to this addressYour energy supplier
Your complaint to your gas or electricity supplier, which comes first.
The address on your billor your supplier's complaints pageSay what went wrong and what you want your supplier to do, and keep a copy.
Write your complaint letterA wrong energy bill
If your complaint is about a bill that is wrong.
British Gas, OVO Energyand other suppliersOur bill dispute letters explain the billing rules that protect you.
See bill dispute lettersChecked against the Energy Ombudsman website on 18 October 2026.
Why Send It With PostRight
Proof It Arrived
Choose Tracked 24 and you can see when your letter was delivered, with a photo on delivery. Useful when a deadline or reply time counts from the day it arrives.
No Printer, Envelope or Stamp
Type your letter or upload a PDF on any device. We print it, put it in the envelope and post it.
Posted Today
Order by 2.30pm on a working day and we post it the same day by Royal Mail.
The Address Done for You
Press Write to this address and we fill in the address exactly as it is shown on this page.
How It Works
- 1Complain to your supplierWrite to your supplier first, saying what went wrong and what you want it to do. Keep a copy.
- 2Write to the Energy OmbudsmanAfter 8 weeks, or once you have a deadlock letter, press Write to this address and we fill in the Energy Ombudsman's address. To send copies of your evidence with it, upload your letter and the copies together as one PDF.
- 3We print it and post itOrder by 2.30pm on a working day and we post it the same day by Royal Mail. Choose a tracked service for a record of when it arrived.
Complain to Your Supplier First
The Energy Ombudsman only looks at a dispute once your supplier has had the chance to sort it out. Your supplier has 8 weeks. If it sends you a deadlock letter, saying it will not do any more, you can go to the Energy Ombudsman straight away.
Put your complaint in writing and keep a copy. A tracked letter shows the date it arrived, which helps you count the 8 weeks.
Time Limit
You must take your dispute to the Energy Ombudsman within 12 months of your supplier's deadlock letter.
In June 2026 the Energy Ombudsman announced plans to cut the 8 week wait to 6 weeks. It has not given a start date, and its FAQs still say 8 weeks.
What It Covers
The Energy Ombudsman handles disputes with energy suppliers, heat networks, network operators, flexibility service providers and Green Deal providers, as long as the business is a member of its scheme and trades in Britain. It cannot fine or punish companies, or tell them how to run their business.
What Happens Next
The Energy Ombudsman expects to reach a decision within 6 weeks. If you accept it, your supplier must carry it out within 28 days. If you reject it, you can still take your complaint elsewhere, such as to court.
Other Ombudsman Guides
Frequently Asked Questions
Energy Ombudsman, PO Box 966, Warrington, WA4 9DF. You can also register a dispute online, by email or by phone.
Send your energy complaint today.
Write or upload your letter, choose your service at checkout, and we print it and post it by Royal Mail.
Write Your Letter