Meter Serial Number Does Not Match Your Bill?
A serial number mismatch can mean the supplier is billing against the wrong meter record, especially in flats, new builds, converted properties or after meter exchanges.
Use together
The short answer
If the serial number on the bill does not match the meter in your property, do not only dispute the amount. Ask the supplier to confirm the meter details, supply point and reading history before rebilling.
What to check
Meter plate
Take a photo of the meter serial number.
Bill details
Find the serial or meter point shown on the bill.
Property setup
Check if there are multiple meters, flats or a recent meter exchange.
Reading history
Ask which readings belong to which meter.
Serial number mismatch wording
The meter serial number shown on my bill/account does not appear to match the meter at my property.
Bill/account serial number: [serial on bill].
Meter serial number at property: [serial on meter].
Please investigate whether my account is linked to the correct meter and provide the reading history used for recent bills.
Please pause collection on the disputed amount until the meter identity and readings are confirmed.
MPAN, MPRN and the meter serial number
Three different identifiers, and knowing which is which is what turns a vague “something is wrong” into a specific, answerable question.
| What it identifies | Where to find it | Does it change? | |
|---|---|---|---|
| MPAN Supply Number | The electricity supply point — the physical connection to your property. | On your electricity bill, in a grid box, usually starting with an S. 13 digits in the bottom row. | No. It stays with the property. |
| MPRN Meter Point Reference | The gas supply point. 6–10 digits. | On your gas bill. Sometimes called the M number. | No. |
| Meter serial number | The physical box on your wall. | Printed on the meter itself, and on the bill. | Yes — it changes every time the meter is exchanged. |
That last row explains most serial mismatches. A meter exchange should update the account record; when it does not, readings from the new meter get applied to the old meter's history and the figures go haywire. It also explains why the fix is usually quick once the right question is asked: the supplier only has to look at the exchange record.
The question that resolves it fastest
“Please confirm the meter serial number currently registered against MPAN [your MPAN] / MPRN [your MPRN], the date it was registered, and the serial number of any meter removed from this supply point. The meter physically installed at my property is [serial from the meter plate].”
Quoting the MPAN pins it to the supply point rather than to your account, which is what stops the answer being about the wrong property in a block of flats.
Four things that produce a mismatch
| Cause | Tell-tale sign | How it gets fixed |
|---|---|---|
| Meter exchanged, record not updated | Your readings are suddenly rejected, or the bill shows enormous or negative usage around one date. | Quickest of the four. The supplier finds the exchange record and re-aligns the readings. |
| Crossed meters | Flats, converted houses, HMOs, new builds. Your usage looks nothing like your household — too high or oddly low. | Slower. Needs a site visit or a physical check with the neighbouring property. Worth pursuing: it can mean years of paying someone else's energy. |
| Wrong supply point on the account | The MPAN or MPRN on the bill does not match the one your neighbours or previous bills show. | Raise it as a supply point issue, not a reading issue, and quote the MPAN. |
| Bill just shows an old record | Everything else is consistent and the numbers look right. | Cosmetic. Ask them to update it, but do not build a complaint on it alone. |
If you suspect crossed meters
This is the one worth real effort. Test it: turn off everything at your consumer unit for fifteen minutes and watch whether the meter you believe is yours stops advancing. If it keeps counting, it is not measuring your property. Photograph the display before and after, note the times, and send both.
Crossed meters can mean you have been paying a neighbour's bill for years. If that is confirmed, the correction period matters — and the back-billing rules apply to any resulting charge for older energy.
The rebill request, written out
Attach the meter photo. Send by email so the timestamp exists.
Point 4 matters more than it looks. Suppliers correct a bill and leave the overpayment sitting as account credit by default. If you want the money back, you have to say so.
Frequently asked questions
Is a serial number mismatch serious?
Yes. It can lead to the wrong usage being billed to the wrong property.
What if the supplier says the bill is still correct?
Ask for the meter point and reading history evidence in writing.
Should I send photos?
Yes. A clear meter photo is usually the fastest way to make the issue concrete.
Is a serial number mismatch serious?
It can be. At the harmless end it is a stale record on the bill. At the serious end it means your account is billed against a meter that is not measuring your property, which is worth investigating properly.
How do I prove the meter in my property is mine?
Turn everything off at the consumer unit for fifteen minutes and see whether the meter stops advancing. Photograph the display before and after with the times noted. It is simple, it is evidence, and it settles the question.
What is the difference between the serial number and the MPAN?
The MPAN identifies the electricity supply point and stays with the property permanently. The serial number identifies the physical meter and changes every time the meter is exchanged. Quoting the MPAN pins your question to the right property.
Official sources used for this page
BillDecoded translates official process and billing information into practical checks. It is not affiliated with the Ombudsman, Ofgem, Citizens Advice, Which? or any supplier.