How to dispute an energy bill without sending a vague complaint
The best disputes are narrow. Pick the exact billing error, attach evidence, ask for a specific correction and keep the escalation route clean.
Pick the dispute type
Dispute flow
| Step | Action |
|---|---|
| 1. Diagnose | Use the exact guide or calculator before writing. |
| 2. Evidence | Collect bill PDF, readings, photos, account balance and supplier messages. |
| 3. Written request | Ask for the correction, not just a review. |
| 4. Formal complaint | Use the template if the supplier does not answer the actual issue. |
| 5. Escalation | Use Ombudsman pages after deadlock or the required complaint period. |
What a strong dispute includes
- The exact bill date and account issue.
- The number that looks wrong.
- The evidence attached.
- The correction requested.
- A deadline or request for the complaints process if unresolved.
Templates and escalation
The escalation ladder, with the dates that matter
Written query
Not a complaint yet. One issue, specific questions, evidence attached. Many are resolved here.
Formal complaint
Use the word, ask for the reference, note the date. This starts the eight-week clock.
Energy Ombudsman
At eight weeks, or immediately on a deadlock letter. Free, and binding on the supplier.
| Day | Do this |
|---|---|
| 0 | Send the written query with evidence. Diary the date. |
| 14 | No substantive reply? Convert to a formal complaint and ask for the reference. |
| 28 | Still nothing? Ask whether this is their final response or request a deadlock letter. |
| 56 | Eight weeks. Refer to the Energy Ombudsman. Free, and this is the point of it. |
| +12 months | Deadline to refer after a deadlock letter. Do not let this pass while still arguing. |
Keep paying the undisputed amount throughout, and say in writing what that amount is. It costs you nothing, and it removes the supplier's easiest counter-argument. See the Ombudsman process.
The diagnosis order that saves the most time
Work down this list. Each check is faster than the one below it, and each one rules out a cause that is more likely than the next. Most people start at step 7 and never do steps 1 to 3.
| # | Check | Time | If this is it |
|---|---|---|---|
| 1 | Is the reading estimated? Look for an E beside the readings. | 30 seconds | Submit an actual reading and ask for a rebill. More |
| 2 | How many days does the bill cover? A 3-month bill next to a 2-month bill is not a like-for-like comparison. | 30 seconds | Nothing is wrong. Compare cost per day instead. |
| 3 | Did the rates change? The cap moves every quarter. | 1 minute | Compare kWh, not pounds. That separates price from usage. |
| 4 | Do the readings on the bill match your meter? | 3 minutes | Wrong reading. More |
| 5 | Is the standing charge line right? Days × p/day ÷ 100. | 1 minute | Check for overlapping billed days. More |
| 6 | Has anything changed at home? Occupancy, an EV, electric hot water, a dehumidifier, a colder winter. | 2 minutes | Real usage. Not a billing error. |
| 7 | Does the meter advance with everything off? | 15 minutes | Now you have a meter or crossed-meter case. More |
The single most useful habit: compare kWh, not pounds. A bill that rose 40% in money might be 5% more energy at 33% higher rates. Pounds mix the two together and tell you nothing about which one to complain about. Every bill shows the units used — use those.
What separates a strong dispute from a weak one
| Weak | Strong | |
|---|---|---|
| The issue | “My bill is far too high and this is unacceptable.” | “The bill dated 3 June uses an estimated reading of 41,900. The actual reading on 3 June was 41,208.” |
| The evidence | A screenshot of the balance. | The full bill PDF, a dated meter photo, and the reading history. |
| The remedy | “Sort this out.” | “Rebill using 41,208, refund the £186 overcharge to my bank, and reset the direct debit on the corrected forecast.” |
| Payment | Cancelled the direct debit. | “I accept £94 of this bill is owed and have paid it. I dispute the remaining £186.” |
| Scope | Three problems and a complaint about an adviser. | One issue, followed properly. |
| Channel | Phone calls and social media. | Email, with dates, building a written record. |
The right-hand column is not more aggressive. It is more specific, and specificity is what gets a complaint escalated internally instead of answered with a template. It is also what an Ombudsman investigator can act on without having to reconstruct your case for you.
When the supplier is probably right
Worth saying plainly, because a complaint built on a legitimate increase burns credibility you may need later.
The bill follows a long run of estimates
The money was always owed; it was just invisible. Your leverage is the repayment period and the rate apportionment, not whether you owe it. Catch-up bills
Something material changed at home
A new occupant, an EV, an immersion heater, working from home, a baby. These are hundreds of kWh, not tens.
It was a cold quarter
A colder-than-average winter adds 5–15% to gas usage for identical behaviour.
The rates went up
The cap changes quarterly. Compare kWh with the same period last year and the picture is usually clear.
But still ask for this
Even on a legitimate bill: an interest-free repayment period at least as long as the arrears took to build, and confirmation the direct debit was recalculated on your corrected annual forecast rather than forecast plus accelerated recovery.
Frequently asked questions
Should I call or write?
Write when possible because the evidence and wording are easier to prove later.
Can I dispute only part of a bill?
Yes. A narrow partial dispute is often clearer than challenging everything.
What if the supplier says the bill is correct?
Ask for a line-by-line explanation tied to the readings, dates and tariff rates.
How do I dispute an energy bill properly?
Name the exact error, attach the evidence, state the remedy you want with a number in it, say what part of the bill you accept and keep paying that, and put everything in writing. Those five things are what separate a dispute that moves from one that gets a template reply.
Is the Energy Ombudsman free?
Yes, free to consumers and funded by suppliers. Its decisions bind the supplier once you accept them, and it can award up to £10,000 on a domestic complaint.
How long does the whole process take?
Realistically about five months end to end for a straightforward billing case: up to eight weeks with the supplier, a couple of weeks for referral, around six weeks for a decision after evidence, then up to 28 days for implementation.