How to find out who my energy supplier is (UK)

Key takeaways

• Gas and electricity can have different suppliers at the same address (so check both).
• Prepayment meters and smart meters still have a supplier — don’t rely on what’s printed on a key/card.
• If a supplier has failed recently, your account may be moving under Ofgem’s process — expect letters, but you can still identify the current supplier.
• If you’ve just moved in, take meter readings on day one and tell the supplier ASAP to avoid paying for the last occupier’s use.

What you’ll want to have to hand

Your postcode and full address

Especially important in flats (include flat number and building name).

Meter serial number (MSN)

Printed on the meter; helps avoid mix-ups in multi-occupancy buildings.

Any reference numbers you can find

MPAN (electricity) or MPRN (gas) from old paperwork if you have it.

How to check who supplies your energy (step-by-step)

Start with the simplest proof first — it’s faster, and it reduces the chance you’ll chase the wrong supplier. If that doesn’t work, move to the official lookup routes below.

1. Check what’s already in your name: look for a recent bill, welcome email/letter, or direct debit on your bank statement (supplier name often appears in the payment reference).
2. Look at the meter carefully: note the meter serial number (MSN) and whether you have separate meters for electricity and gas. In flats, there may be a bank of meters — make sure the meter is labelled for your flat.
3. If you rent, ask your landlord/agent (but don’t stop there if you’re unsure). It’s common for paperwork to be out of date after a switch.
4. Use official supplier-check services: electricity and gas are different. Details and links are in the comparison table below.
5. Contact the confirmed supplier: tell them you’ve moved in, give opening readings, and ask them to set up your account. If you plan to switch, do this step anyway — it prevents billing gaps.

Once you know the supplier: compare your options

After you’ve confirmed who supplies your meter point(s), you can compare deals for your exact address and meter setup. The quote results reflect your postcode, payment method and meter type (including smart and prepay where available).

If you can’t find any paperwork

Don’t worry — it’s common after a move, a bereavement, or a landlord change. The official lookups below are designed for this. Try to note the meter serial number first; it’s the easiest way to avoid being told “that meter isn’t ours”.

Decision checklist: pick your best route

• You’ve just moved in: take opening readings, then use bill/agent info, then official lookups if unclear.
• You’re in a flat with multiple meters: confirm meter serial number first, then do the lookup.
• You suspect an error or you’re being billed for the wrong meter: collect photos of meter serial number and readings before contacting anyone.
• You have both fuels: check gas and electricity separately — it’s normal to have different suppliers.

Official links (UK regulators and advice)

These explain the processes and your rights. They won’t sell you anything.

• Ofgem (energy regulator)
• Citizens Advice: energy (billing, switching, complaints)
• GOV.UK: energy bills and support

You can’t “opt out” of the current supplier on move-in

When you move in, you inherit the existing supplier for that meter point. You can usually switch later, but you still need to contact the current supplier first so bills start in your name from the right date.

Prepayment meter confusion

A key/card might show a brand, but it doesn’t always prove who currently supplies you. Supplier changes, meter exchanges and legacy keys can muddy the waters. If you’re unsure, confirm via official lookup and then ask the supplier to link the correct top-up device to your account.

Records can lag after a new meter or new-build

If the property is newly registered or your meter has just been changed, the “who supplies me” databases may take time to catch up. Keep a photo of the meter serial number and any installer paperwork; it can speed up corrections.

If you’re worried about debt

Finding out the supplier doesn’t automatically make you responsible for someone else’s debt — but sorting it early matters. Tell the supplier your move-in date, provide opening readings, and ask them to investigate if a balance looks wrong. For independent help, start with Citizens Advice on energy supply.

Potential costs to be aware of

• Exit fees: some fixed tariffs have them; your supplier can confirm.
• Backbilling rules: if billing has been wrong, rules may limit how far back suppliers can charge in certain cases (see Citizens Advice).
• Standing charges: apply on many tariffs even with low usage (check before switching).

Can my gas and electricity have different suppliers at the same address?

Yes. Dual fuel is common, but it’s not automatic. You might have one supplier for electricity and another for gas, especially after a past switch. If you’re unsure, check both meter points separately before setting up accounts or comparing deals.

How do I find my electricity supplier if I don’t have a bill?

Use the official electricity meter-point route: identify your Distribution Network Operator (DNO) and ask for the supplier linked to your MPAN (Meter Point Administration Number). Start with Ofgem’s guidance and contact details via Ofgem. Have your address and meter serial number ready.

How do I find my gas supplier if I don’t have a bill?

You can find the supplier for your gas meter by using the MPRN (Meter Point Reference Number) enquiry route. You’ll usually need your address, and sometimes meter details. If you get stuck, Citizens Advice explains the options and the information to gather: Citizens Advice: energy supply.

I have a smart meter — can I see my supplier on the in-home display?

Sometimes you’ll see a supplier name in menus or messages, but it’s not a reliable proof of who supplies you now (displays can be re-used or show legacy branding). Treat it as a clue, then confirm using a bill, bank statement, or the official supplier lookup route.

What should I do on the day I move in?

Take clear photos of both meters (showing the serial numbers and readings), note the date/time, and contact the current supplier to open the account in your name. If you want to switch, you can still compare afterwards — but getting the opening details right helps prevent estimated bills.

What if the supplier says they don’t supply my address?

First, double-check you’ve got the correct meter (especially in communal cupboards) by matching the meter serial number. If it still doesn’t add up, use the official lookup routes for your meter point and keep evidence (photos of the meter and labels). Citizens Advice covers billing problems and mistaken identity: Citizens Advice: problems with your energy bill.

Can I switch if I’m on a prepayment meter?

In many cases, yes, but options can be more limited and the process depends on your meter setup and account status. If you’re in debt, switching may be restricted. The safest approach is to confirm your current supplier first, then compare what’s actually available for your postcode and meter type.

Does the network operator (DNO) supply my energy?

No. The DNO owns and maintains the local electricity network (cables and equipment) in your area. Your energy supplier is the company that bills you for electricity or gas. The reason the DNO matters is that they can help identify the correct MPAN and, in some cases, point you to the supplier linked to that meter point.

Page details

Written by

EnergyPlus Editorial Team

Reviewed by

Energy Specialist

Last updated

September 2026

How we assess this (methodology)

This guide is built around the steps that most reliably identify a household’s current supplier in the UK without relying on tariff claims. We prioritise (1) evidence you can see (bills, bank payments, meter serial numbers) and (2) official lookup routes described by regulators and consumer bodies.

We don’t publish supplier-specific prices, tariff names or eligibility rules here because they change frequently and can be postcode- and meter-dependent. Instead, we point you to live comparisons for your address, and we flag common failure points (wrong meter in a bank, new-build records, supplier failure transitions).

Limitations: supplier databases can be temporarily out of date after meter exchanges, new connections, or ongoing switches. If you’re told conflicting information, gather meter photos and ask for the meter point identifiers (MPAN/MPRN) to be checked.