Can my supplier block me from switching?

Where a switch is stopped, it is usually stopped by an "objection" raised by the supplier losing the customer, not by the one gaining them. Objections must rest on a permitted ground. A supplier that objects without one, or that lets a switch drift past the five working days the Energy Switch Guarantee commits to, is in complaint territory, and the Energy Ombudsman can order redress².

This page sets out when a hold-up is legitimate, what the debt and prepayment rules actually say, how objection codes work, and the escalation route when a switch is delayed or refused.

Can a supplier block a switch? The short answer

No, not at will. A domestic supplier operates under licence conditions that prohibit undue discrimination in the terms and conditions offered to customers, and the switching process itself is governed by rules designed to keep it fast and reliable⁵. A supplier that simply refuses to release a customer has no lawful basis for doing so.

What a supplier can do is raise an objection on a permitted ground. The main one is debt. Ofgem's consumer guidance is direct: you cannot switch if you have been in debt to your supplier for more than 28 days¹. That is a rule about the account, not about the supplier's preference, and it applies whether the debt arose from a missed Direct Debit, a disputed bill or a final bill left unpaid.

There is a second category of block that has nothing to do with debt: the household may not hold the supply contract at all. Residents on a landlord's business contract may not have the right to choose their own energy supplier or switch suppliers themselves⁶. Where a resident holds their own contract with an energy supplier, they may be able to switch their business energy supplier⁷. That distinction matters in blocks of flats, serviced buildings and some park home sites, and it is a contractual limit rather than a supplier refusing anything.

A third category is administrative. A supplier can withdraw a transfer application at any time before the application is approved, which is a normal part of the registration process rather than a punishment⁸. Withdrawals happen when the data on the transfer is wrong, when the customer cancels, or when the two suppliers cannot reconcile the meter point.

When a switch can legitimately be held up

Beyond debt, several practical conditions can delay a switch without anyone acting in bad faith. The most common is a live supply that cannot simply be reassigned. Electricity North West states that it cannot move a supply whilst it is live on the network, and it must be disconnected first⁹. That applies to physical moves of a meter or supply point, and it is a safety and network rule rather than a supplier's choice.

Meter ownership creates a related limit. The electricity supplier owns the meter and is the only company that can move it, so the customer must arrange for the supplier to visit to move and connect the meter¹⁰. A household that wants the meter relocated as part of a move cannot treat that as a switching matter.

Supplier failure is the case where a switch is protected rather than blocked. If you were already in the process of switching when your supplier failed, you will still move to the supplier you chose¹¹. The failure does not strand the transfer.

There is also the erroneous transfer problem in reverse. A switch can go wrong because a supplier made a mistake, for example by confusing your address with someone else's, or because you were misled by a salesperson¹². Those cases are corrected through the erroneous transfer process, and the supplier that caused the error carries the cost of putting it right.

Debt, prepayment meters and the switch block

Debt is the single most common reason a switch is stopped, and the rules differ by payment method. For a customer paying by Direct Debit or on receipt of a bill, the 28-day rule applies: you cannot switch if you have been in debt to your supplier for more than 28 days¹. For a prepayment customer, the limit is a balance rather than a period. You can switch while owing up to £500 for gas and £500 for electricity, and owing more than that prevents the switch¹.

That £500 figure is a ceiling on the block, not a target. A prepayment customer owing less than £500 for electricity is not blocked by the debt rule, though other conditions may still apply. Suppliers may also prevent a switch where there are bills over 28 days old, or a high balance outstanding on a prepayment meter, until the outstanding amount is paid³.

The debt rules interact with the prepayment installation rules. A supplier can install a prepayment meter without permission if you are building up an energy debt and other ways of recovering that debt have not worked¹⁴. Separately, a supplier may decide to install a prepayment meter if you sign up to a plan but default on it¹⁵. Both routes put a household onto a meter type that changes the switching arithmetic, because the £500 limit then governs rather than the 28-day rule.

There is relief short of paying in full. A customer can ask their supplier to pause repayments for a short amount of time; the supplier must consider the situation but does not have to agree¹⁶. Where a repayment plan is agreed and kept to, the debt is being managed, and the block normally lifts once the account is no longer in default.

Objection codes and what they mean

An objection is the industry mechanism by which the supplier losing a customer tells the switching process to stop. It is not a code the customer sees or quotes; it is a signal between suppliers, and it must be justified. Ofgem has treated the ability of suppliers to block consumer switches by objection as something to review, and flagged that review as part of its work on faster and more reliable switching¹⁷.

The wider problem the regulator identified is coordination. Ofgem's own letter to industry recorded that the lack of coordination between industry parties, suppliers and electricity distribution network operators alike, was hindering the timely consideration of code modifications, the consideration of cross-code issues and delaying the realisation of benefits for consumers¹⁸. In plain terms, objections and transfers can stall because the parties involved are not talking to each other efficiently, not because any single supplier has decided to refuse.

Where a switch is delayed, the guaranteed standards framework sets out when a supplier is excused. Under the Electricity and Gas (Standards of Performance) (Suppliers) Regulations 2015, exemptions include a formal dispute between supplier and customer that is still ongoing as to the amount of the credit balance due or the refund method, a customer who gave an inaccurate postal address for a cheque refund, or delay due to events outside the supplier's control¹⁹. A customer who asked the supplier not to attend the premises where attendance is necessary is also outside the standard¹⁹.

Those exemptions are narrow and specific. They cover refund disputes and practical failures, not a supplier's commercial reluctance. A household that has been objected to without one of these grounds has a complaint, and the licence conditions prohibiting undue discrimination in terms and conditions are the backdrop to it⁵.

What to do if your switch is delayed or refused

The first step is to establish which of the two situations applies. A delayed switch is one that is proceeding but slow. A refused switch is one that has been objected to or cancelled. The remedies differ.

For a delayed switch, the Energy Switch Guarantee sets the expectation: a switch should take no longer than 5 working days³. A switch should not take more than 5 working days in any case, though a customer can ask to delay it². If the switch runs past that, the delay is the complaint.

For a refused switch, the ground matters. If it is debt, the route is a repayment plan and, where needed, a request to pause repayments, which the supplier must consider but need not agree¹⁶. If it is a landlord's business contract, the route is the contract itself, because residents on such a contract may not have the right to choose or switch supplier⁶. If it is an erroneous transfer, the route is correction through the supplier that made the error¹².

Where a switching mistake has occurred, the guaranteed standards bite. A supplier that takes more than 20 working days to reply after being told about the switching mistake owes £40 extra compensation¹. That is a defined payment, not a discretionary gesture.

Throughout, the account position matters. Your old supplier will refund any credit in your final bill, and you could get compensation if they do not²⁰. A final bill is not a reason to withhold a switch, but unpaid debt on it can block a future one.

Taking it further: complaints and the Energy Ombudsman

The Energy Ombudsman is an independent service, separate to Ofgem, for problems with an energy supplier, an energy broker, a network operator or a heat network supplier²¹. It is the endpoint for a switch dispute that the supplier has not resolved.

The gate is time. Before raising a dispute, a customer must allow the supplier 8 weeks to put things right, unless a Deadlock Letter arrives sooner²². The same requirement appears across the Ombudsman's case pages: a complainant must have allowed the supplier 8 weeks to resolve the dispute or have received a Deadlock Letter permitting earlier escalation⁴. Customers need to have complained to the supplier first, waited 8 weeks or received a Deadlock Letter, hold sufficient evidence including the complaint date, and confirm the supplier name matches the bill²³.

Evidence decides these cases. For delayed switch complaints, suppliers support their case by providing details explaining the reason for the delay along with the actions taken, such as a copy of requested information²⁴. A household that has kept its own record of dates, calls and letters is in a stronger position than one relying on the supplier's file alone.

If the complaint is about how a supplier handled a prepayment meter installation, the same escalation applies: you can contact the Energy Ombudsman if you are not happy with the way your supplier has handled your complaint¹⁴. And for any energy bill complaint, the Ombudsman is available once the supplier has had its chance²⁶.

Two related points sit alongside a switch. On the Warm Home Discount, switching away from a supplier that offers the discount to one that does not means losing it, even for the core group, so the new supplier's criteria matter before moving²⁷. On credit, the old supplier must refund any credit in the final bill, with compensation if they do not²⁰. Neither is a block, but both are consequences a household should weigh before switching.