200
Typical supplier debt threshold to allow a switch
Set by suppliers, not Ofgem; varies £150 to £500
0
Engineer visits needed for a SMETS2 smart-meter mode change
Remote configuration flip over the smart-metering network
8 weeks
Deadline before you can escalate to the Energy Ombudsman
If the supplier has not resolved your switch request
Why most "switch from prepayment" guides bury the lead
Most guides on switching from a UK prepayment meter to Direct Debit list the same five steps: call the supplier, agree a date, wait for the engineer, pass a credit check, sign the Direct Debit. That advice is out of date. Since SMETS2 smart-meter coverage passed 71% of UK homes at the end of 2025, the majority of prepayment customers no longer need an engineer. The meter is already there; the supplier only needs to send it a new instruction.
Suppliers do not lead with this because prepayment customers are, on average, lower-risk revenue: the meter cannot run a debt. The standard inbound script asks whether you want to "switch from prepayment", which routes you into the legacy engineer-swap process. Asking instead for "a remote mode change on my SMETS2 smart meter to credit mode" routes you into a faster software process.
Two routes off prepayment: engineer swap vs smart mode change
There are two physically different ways to leave a prepayment meter behind. Which one applies depends on what meter is already on your wall.
The engineer swap (traditional key or card meter)
With a traditional key (gas) or card (electricity) prepayment unit, the only way to move to credit billing is a physical meter swap. The supplier books an engineer, you take a final reading, the new credit meter is wired in. Expect 2 to 6 weeks depending on supplier backlog. None of the large suppliers charge for this; if yours does, switch supplier first.
The smart-meter mode change (SMETS2)
SMETS2 smart prepayment meters (rolled out from 2018) can be reconfigured remotely. The hardware is identical to a credit meter; only the operating mode differs. The supplier sends a command over the DCC network, the meter accepts it within minutes to a few days, and from then on you are billed on usage instead of pre-paid credit.
Insider tip. When you call, ask specifically for "a remote mode change on my SMETS2 smart meter to credit mode". This phrase routes your call differently from "I want to switch from prepayment". You will be transferred to the smart-metering operations team, not the standard switching team, and the timeline drops from weeks to days.
Advantages
- No engineer visit needed for SMETS2 smart meters;
- Typical wait time of 3 to 10 working days;
- No charge from any large UK supplier;
- Easy to reverse if you change your mind within 14 days.
Disadvantages
- Only available on SMETS2 smart meters, not older SMETS1 or traditional units;
- You still have to pass the supplier debt threshold and credit check;
- Some call-centre agents are unfamiliar with the request and try to default you to the engineer-swap process.
Eligibility: what suppliers actually check
Eligibility comes down to three questions in this order. It is worth preparing each before you call.
The debt threshold on the meter
Most large UK suppliers will not switch you while you owe more than roughly £200 on the prepayment account. This is a commercial threshold, not an Ofgem rule; it ranges from £150 with strict suppliers to £500 with the most flexible. Staff can usually share the exact figure on request.
Under the threshold, you can clear the balance in a lump sum or roll it into the new Direct Debit. Over the threshold, the "If you are in debt" section below lists the legitimate routes to bring it down.
The credit check
Once debt is settled, the supplier runs a credit check. They want evidence you will keep up monthly payments. A clean six months of regular prepayment top-ups counts in your favour, as does being on the electoral roll and having a current account in regular use.
Failing the check is not the end of the road. Suppliers can accept a slightly higher fixed Direct Debit, a guarantor, or a managed payment plan that mimics prepayment behaviour on a credit meter. Ask which alternative arrangements they offer before accepting a refusal.
Tenant or owner status
Owners can request the change without further consent. Renters need to know whether the change is physical or remote: a SMETS2 mode change leaves the equipment untouched and rarely needs landlord sign-off, while a physical swap usually does. The renter section below covers consent rules in detail.
What to say on the call to your supplier
A specific opening sentence cuts call time in half and sends you to the right team first time. Have your account number, MPAN (electricity) and MPRN (gas) ready before you dial.
SMETS2 smart prepayment meter:
"My account number is [number]. Please request a remote mode change on my SMETS2 smart meter from prepayment to credit mode. Can you check my debt balance and confirm whether I am eligible?"
Traditional key or card prepayment meter:
"My account number is [number]. Please book a meter exchange from prepayment to a credit meter on Direct Debit. Can you confirm my debt balance, run the credit check and book an engineer date?"
If the agent says it is not possible, ask for two things: the exact reason in writing, and a referral to the supplier's complaints team. Do not hang up without a reference number for the call.
If you are in debt: what your real options are
Debt is the most common reason switches stall. Four routes exist; most prepayment customers know about only one. Used together they can bring a balance under the threshold in weeks rather than months.
Supplier hardship and Trust funds
Several large suppliers run charitable Trust funds that write off energy debt for households on low income or in financial hardship. Examples include the British Gas Energy Trust, the EDF Customer Support Fund and the Octopus Energy Assist Fund. Applications take 4 to 8 weeks but can clear several hundred pounds of arrears in one decision.
Direct write-off requests
If the debt is old, you have been a long-term customer in good standing, or the supplier has previously breached Ofgem rules in your case, write directly asking for a partial or full write-off. Frame it around circumstances and record, not entitlement. Suppliers wrote off significant balances during the 2022 to 2024 enforcement period and many still apply that flexibility quietly.
Fuel Direct from Universal Credit
If you receive Universal Credit, ask DWP to pay your supplier directly out of your benefit (Fuel Direct or Third Party Deductions). The deduction is capped around 5% of your standard allowance and covers both current usage and arrears. It is slow, but it proves arrears are being repaid structurally, which can unlock a switch before the balance is fully cleared.
Free debt-management advice
Free, regulated advice from Citizens Advice, StepChange or National Debtline can negotiate a payment holiday, a lower repayment rate, or include energy debt in a Debt Management Plan. Never pay a private firm for the same advice.
If you rent: the consent rules that actually apply
Tenants are often misinformed about meter changes; landlords are often misinformed about their rights. The legal position in England and Wales is straightforward.
If you are the named account holder and pay the supplier directly, you choose how you pay, including switching to Direct Debit. A remote SMETS2 mode change does not modify physical equipment and rarely needs landlord consent; the supplier should action it on your request alone.
A physical meter swap is different. The meter is an asset attached to the property, so changing it counts as a modification. Most tenancy agreements ask you to notify the landlord beforehand. A sensible landlord usually agrees, because a credit meter is more attractive to future tenants. If the landlord refuses, ask in writing for the reason; an unreasonable refusal is not enforceable under Ofgem rules on the customer's right to choose payment method.
If the landlord pays the supplier and bills you for energy, you are not the customer of record. The fix is to put the supply in your own name first, then proceed as an account holder.
Your rights against a forced install. Suppliers are banned from forcibly installing prepayment meters in homes with children under 2 or where anyone over 75 lives without support. Court warrants are a last resort and suppliers must exhaust all other options first. Ofgem enforcement led to £18.6 million in compensation across roughly 40,000 affected customers. Refuse in writing and report any forced install to Ofgem.
Check your switching eligibility
Answer 5 short questions. The verdict updates as you go, with a plain-language next step tailored to your answers.
1. Has your prepayment meter been installed in the last 2 years?
2. Is your prepayment balance currently positive (in credit, not emergency credit)?
3. Do you owe debt on the meter?
4. Is your meter a SMETS2 smart meter?
5. Do you rent your home?
If your supplier says no
A refusal on the first call is not the end of the road. Suppliers must handle complaints under Ofgem rules and the escalation path is clear.
Ask for the refusal in writing, with the specific reason. This forces the supplier to commit to a position you can challenge concretely rather than a vague "computer said no". Follow up if you do not have the letter or email within 14 days.
Open a formal complaint through the supplier's complaints process (published on every supplier's website). Use the words "I am raising a formal complaint" so it is logged correctly. Suppliers have 8 weeks to resolve a complaint or issue a final response. If they miss the deadline or you reject the response, escalate to the Energy Ombudsman, which is free for the customer and binding on the supplier.
Report systemic issues (forced installs on protected households, repeated refusals on mode-change requests) to Ofgem. Ofgem does not resolve individual cases but does take supplier-level enforcement action, which is how the £18.6 million in 2024 compensation came about.
Frequently asked questions
Yes, if it is a SMETS2 smart meter. The change is a remote configuration update sent over the smart-metering network. No engineer visit is needed and the switch usually takes effect within a few working days. You still have to pass the supplier eligibility checks (debt threshold and credit check), but the physical swap is replaced by a software flip.
Most large UK suppliers use a threshold around £200 of outstanding debt on the meter. Some accept up to £500 if you have a strong top-up history, others sit closer to £150. The exact figure is set by the supplier, not by Ofgem, so always ask yours for its current limit before assuming you cannot switch.
You can ask the supplier to accept an alternative arrangement, such as a fixed Direct Debit set slightly above estimated usage, a guarantor, or a managed-debt plan. If those are refused, you can stay on prepayment without penalty and try again with a different supplier after six months of clean top-ups, which often improves your credit profile.
If you are the named account holder and pay the supplier directly, you can request a meter mode change yourself; you do not need the landlord to approve a remote smart-meter switch. A physical swap (removing a key meter and fitting a credit meter) usually does require landlord consent because the equipment belongs to the property.
For a smart-meter mode change, expect 3 to 10 working days from the day the supplier confirms eligibility. For a physical engineer swap, expect 2 to 6 weeks depending on supplier backlog. If the supplier misses its own published timeline, you can escalate to the Energy Ombudsman after 8 weeks without resolution.
The per-kWh price is now essentially the same on prepayment and Direct Debit caps, so you will not save on the unit rate alone. The real saving comes from access to fixed deals (credit-meter only), avoiding self-disconnection penalties, and not paying for emergency-credit clawback. For a household that self-disconnects even occasionally, switching typically saves £40 to £80 a year.