Who is my electricity supplier?

That distinction answers most of the confusion behind the question. If you want to know who bills you, the fastest route is your own paperwork, then a postcode lookup, then a phone call to 105. If you want to know who to ring when the lights go out, the answer is never your supplier.

What a supplier is, and how it differs from your network operator

The supplier is the commercial party. Your electricity supplier is the company you choose to buy your electricity from, and who you pay your bills to¹. It buys wholesale energy, sets your tariff, issues bills, handles your account and is the company named on the bill. An energy supplier is responsible for providing energy to homes and businesses⁶.

The network operator is the physical party. Energy network operators are different to your energy supplier and you don't pay your bill to them⁷. They own and maintain the cables, substations and meters that carry electricity to your door, and they are responsible for fixing power cuts and paying you compensation⁸. The same split applies on the gas side, where the gas distribution network operator is a company different and separate to your energy supplier⁹.

That separation matters for household independence. You can change supplier at will, but you cannot change network operator: the wires to your home are a regional monopoly, and the company that owns them is fixed by where you live. Your dependence on the grid is therefore structural, not commercial. What you control is the contract, not the connection.

The Energy Ombudsman can look at disputes involving your energy supplier, energy broker, network operator, green deal or heat network supplier, so the two roles are treated as distinct even in the complaints system¹⁰.

Find your supplier by asking your local distribution company

There are three practical routes, and they work in different ways.

The first is your own paperwork: a bill, a statement or an online account names the supplier directly. The second is a postcode lookup. The Energy Networks Association runs a tool to find your network operator, and you can find the details for all the electricity Distribution Network Operator companies on the Energy Networks Association site¹¹. For gas, the Find My Supplier service requires only a postcode to identify your gas supplier¹². Some operators go further: Electricity North West offers an online search tool to help identify your electricity supplier, one of five such tools¹³.

The third route is the phone. If you still can't find the information, call 105 to speak to your local electricity network operator (DNO), who can tell you who your supplier is¹⁴. The call is free and it connects you to the network company for your area, not to a supplier.

If you live in London, the South East and the East of England and are the electricity bill payer you can use UK Power Networks' online tool¹⁵. Coverage of these operator-run tools is regional, which is why the postcode and phone routes remain the reliable fallbacks.

What your supplier handles once you know who it is

Once you have a name, that company is your point of contact for almost everything commercial. It bills you, sets your tariff, holds your account and manages your meter. Your electricity meter is owned by your electricity supplier¹⁶, which is why meter faults, replacements and access arrangements run through the supplier rather than the network operator.

There are limits to that. If a meter board does not hold the network operator's electricity supply, the electricity supplier is responsible for the replacement¹⁷. Where the board does hold the network supply, the operator handles it. The dividing line is physical: whatever carries or measures the supply belongs to one party or the other, and the supplier's responsibility stops at the boundary.

Switching is also the supplier's job. The new energy supplier you have chosen will manage the switch¹⁸, including the transfer of your account and the notification to your old supplier. Switching supplier doesn't change the energy you receive at all, just who you pay for it, so there's no need to change any pipes or cables and there is no interruption to supply¹⁹. If you pay a supplier directly for the electricity or gas you use at home, you can choose to switch to a different supplier or tariff at any time²⁰.

For a household, this is where independence is real but partial. You can move your account between suppliers without touching the infrastructure, and you can do it at any time. You cannot move the meter, the cable or the connection. The supplier relationship is the one lever a household holds.

When your supplier changes without you switching

Two situations produce a change of supplier that you did not initiate.

The first is moving home. When you move in, whoever supplied energy to the previous owners will automatically become your supplier²¹. You inherit the account whether or not you chose it. The practical steps are to find out who your energy supplier is, contact your supplier to let them know you've moved in, and submit your meter readings and take pictures for evidence²². In a newly built home the developer or house-building company will be able to tell you who supplies the gas and electricity²². In a rented house you can find out who the supplier is from your landlord²².

The second is supplier failure. You do not need to do anything if your current supplier goes out of business: Ofgem will automatically move you to a new supplier and make sure your energy supply is not interrupted²⁰. When an energy supplier ceases trading, to prevent a drop in service to customers Ofgem will appoint another supplier to provide their energy supply²³. If your energy supplier goes out of business because of financial problems, you will still have electricity and gas supplied to your home or business, and your energy supply will not be cut off²⁴.

There is also the erroneous transfer, where a switch happens without your agreement. When you're switched back you'll still get bills from your old supplier, and you won't have to pay the new supplier anything²⁵. The Energy Ombudsman can consider disputes of this kind alongside complaints about suppliers, brokers and network operators¹⁰.

Suppliers and the price cap: what affects your bill

The price cap is set by Ofgem, Great Britain's energy regulator, and it limits the maximum amount of energy suppliers can charge you for each unit of energy you use²⁶. It is set by Ofgem and limits how much a supplier can charge for each unit of electricity and gas you use²⁷.

The critical qualification is what the cap does not do. The price cap is not the maximum amount your bill can be; it's the maximum amount you'll pay per unit of energy you use²⁷. A household that uses more units pays more, however the cap is set. The standing charge, the fixed daily amount, is set by your supplier and included in the energy price cap set by Ofgem²⁷.

The cap applies in Great Britain. Northern Ireland has a separate market and separate arrangements, so the cap described here does not govern bills there.

Knowing your supplier also determines access to support. The Warm Home Discount scheme requires large domestic energy suppliers to provide an annual discount of £150 to eligible households⁵, and it requires suppliers to provide an electricity bill discount for certain customers²⁸. To qualify you must be a customer of an electricity supplier and be an account holder or named on an electricity bill²⁹, and your energy supplier must be part of the scheme³⁰. The same conditions apply in Scotland³¹ and in England and Wales³⁰.

For a household, the cap and the discount both run through the supplier, not the network. That is the remaining dependence: the price you pay is set within a regulatory framework you do not control, and the support you can claim depends on which company holds your account.