In short (UK): Wrong energy bills can be challenged. Photograph your meter, compare to the bill, complain in writing, and use the supplier’s process (often up to 8 weeks). Back-billing over 12 months is often restricted when the delay was not your fault. Then escalate free to the Energy Ombudsman. This is general guidance, not legal advice.
Energy bills are confusing and large errors are scary. This guide covers the core route — not a full case file. For a personalised plan and letter, use Refundly.
Common Problems
Estimated bills; wrong readings; tariff/duplicate errors; multi-year back-bills; missing credits; switching mistakes.
Back-Billing — 12-Month Limit
Ofgem rules generally stop suppliers charging for energy used more than 12 months ago when the failure to bill correctly was not your fault. Challenge old back-bills quickly.
What to Do Next (High Level)
- Photo the meter and compare to the bill.
- Gather recent bills and tariff info.
- Complain to the supplier — confirm in writing.
- Complete their process (often 8 weeks or deadlock letter).
- Escalate to the Energy Ombudsman if needed.
| Problem | Likely aim |
|---|---|
| Wrong reading overcharge | Corrected bill + refund/credit |
| Back-bill over 12 months (not your fault) | Reduction or write-off |
| Switching error | Fix + refund from the responsible supplier |
Suppliers dispute timelines — yours should be dated
What Your Complaint Should Cover
Account and address; which bills are wrong; meter readings with dates; refund/correction wanted; back-billing point if relevant; response deadline.
Refundly structures the complaint so you are not starting from a blank page
Energy Ombudsman
Free and independent after the supplier process. They can order refunds, corrections, and sometimes further awards.
Direct Debit Credit
You can usually request a refund of surplus credit. Formal complaint if they refuse without justification.
Using Refundly for Utility Disputes
- Select utilities & telecom
- See complaint and ombudsman path
- Timeline of readings and bills
- Formal letter + tracking
Final Tip
Submit monthly meter readings. Prevention beats a surprise back-bill.
General information for UK consumers only — not legal advice. See Ofgem guidance and the Energy Ombudsman.
Common questions
Short answers to common questions on this topic.
- Can my energy supplier back-bill me for years?
- Often no. Ofgem back-billing rules usually stop suppliers charging for energy used more than 12 months ago when the delay was not your fault. Large multi-year back-bills should be challenged immediately.
- How do I complain about a wrong energy bill?
- Compare your meter reading to the bill, complain to the supplier (confirm in writing), use their complaints process (typically up to 8 weeks), then go to the Energy Ombudsman if unresolved or deadlocked.
- Can I get surplus direct debit credit refunded?
- Usually you can request a refund of reasonable credit balances. If the supplier refuses without good reason, raise a formal complaint.
- Is the Energy Ombudsman free?
- Yes for consumers. They can order bill corrections, refunds, and sometimes awards for distress — after you have tried the supplier’s process.
- What evidence helps most?
- Dated meter photos, 12 months of bills, tariff details, and a log of every call and email with reference numbers.