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Change Your Electricity Supplier in Five Working Days: Ofgem Rights

Hands checking an electricity meter before switching supplier

Switching electricity supplier means choosing a new tariff, agreeing the contract, and letting the new supplier handle the rest. It contacts your old supplier automatically, and the switch normally completes within five working days. A 14-day cooling-off period protects you throughout, though prepayment meters and customers in debt face extra rules. Before starting, have a meter reading, your postcode, and your current tariff name ready.

TL;DR:

  • Comparing tariffs should include standing charges, contract length, and exit fees, not just the headline unit rate, to ensure actual savings.
  • A final meter reading is crucial on switch day to prevent billing disputes rooted in estimates, so photograph and date your reading.
  • Switching completes within five working days for most households, with a 14-day cooling-off period allowing cancellation without charge during this window.
  • Debt up to £500 per fuel or recent unpaid bills typically do not block a switch, while older debt or high balances may cause delays or restrictions.
  • When moving house, notify your current supplier 48 hours in advance, take meter readings at both addresses, and confirm you are authorized to switch.
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Table of Contents

How can I change my electric supplier step by step?

Changing supplier is largely administrative once you’ve picked a deal. Here’s the order that works:

  1. Compare tariffs first. Gather your postcode, current supplier name, tariff, and a recent meter reading or annual kWh figure from a bill.
  2. Choose a new tariff and sign up, either through a comparison site or directly with the supplier, online or by phone.
  3. Let the new supplier take over from here. It contacts your old supplier and arranges the switchover date. You generally don’t need to speak to your old supplier yourself.
  4. Take a final meter reading on switch day and expect welcome information, your new account number, and confirmed rates within a few days after.

That fourth step is the one people skip, and it’s the one that causes most billing disputes later. Without a dated reading from you, both suppliers rely on estimates, and estimates rarely favour the customer.

The admin genuinely is lighter than most households expect. You’re not cancelling anything, and you’re not risking a blackout. Electricity keeps flowing through the same wires and the same meter throughout, whichever company happens to be billing you.

Pro Tip: Screenshot or photograph your meter reading with the date visible, then email it to yourself. If a dispute arises weeks later, a timestamped photo settles it faster than a memory of “sometime in March”.

One detail worth flagging early: if you’re switching electricity only and keeping the same gas supplier, or vice versa, tell the new supplier which fuel you want moved. Dual-fuel switches are the default assumption on most comparison sites, and an unwanted gas switch can trigger its own exit fee back at your current supplier.

What information do you need to switch electricity supplier?

Most switches need less paperwork than people assume. In practice, suppliers can often quote you with nothing more than a postcode and address, since MPAN and MPRN reference numbers sit in national databases that suppliers check automatically. A recent bill still sharpens the quote, because it gives an accurate usage figure rather than a generic estimate.

Before you start comparing, have these to hand:

  • Your postcode and full address, including flat or unit number if relevant.
  • Your current supplier’s name and the specific tariff you’re on (not just “standard variable” — the actual product name).
  • Your estimated annual electricity use in kWh, or a recent bill showing usage over a set period.
  • Your MPAN (the electricity meter point number), if you have it, though it isn’t essential to get a quote.
  • Bank details, if you’re setting up Direct Debit, which almost always secures a cheaper rate than paying on receipt of bill.
  • A current meter reading, taken and dated at the point you apply.

Reading a dual-rate or Economy 7 meter correctly matters more than people realise. These meters show two registers, usually labelled “low” and “normal” or numbered 1 and 2, and you need both figures separately. Submit only one and the new supplier may estimate the other, which skews your first bill.

Smart meter owners have it easier in theory, since usage data transmits automatically. In practice, a manual reading taken on switch day still gives you a paper trail if the automated data feed lags, which it sometimes does during the transfer window itself.

Missing paperwork is rarely what delays a switch. Ofgem’s own guidance confirms that most residential switches complete within five working days once the application is processed, precisely because the process was designed to run on minimal customer input.

How long does switching take, and what are your cancellation rights?

The switch itself moves fast. Once your new supplier has processed your application, Ofgem’s guidance confirms completion within five working days for domestic households, under what’s known as the Energy Switch Guarantee. That clock starts after processing, not the moment you click “sign up”, so there’s often a short administrative gap first while the new supplier verifies your details and contacts your current one.

You’re protected throughout by a statutory 14-day cooling-off period, which starts the day after you agree the contract, not the day you sign.

A consumer who changes their mind within those 14 days can cancel the switch without paying an exit fee or penalty, even if the switch process has already begun. This right exists specifically because energy contracts get agreed quickly, sometimes in a single phone call, and regulators wanted a genuine window to reconsider.

If you cancel mid-process, your old supplier simply continues as before. Nothing changes at the meter, and you won’t be billed twice or left without supply during the gap.

Where things go wrong, compensation exists and it’s automatic in structure, though not automatic in payment; you usually have to ask.

  • Failed or delayed switch: suppliers should pay at least £40 for specific errors or unnecessary delays, according to Ofgem’s compensation framework.
  • Erroneous transfer: if you’re switched without consent, known as an erroneous transfer, your original supplier must be reinstated at no cost and any losses covered.
  • Ongoing billing confusion after switch: raise it as a formal complaint immediately rather than waiting to see if it resolves itself, since compensation claims work better with a paper trail from day one.

The switch process is engineered to be low-friction, but “low-friction” isn’t the same as “error-free”. Roughly one in a handful of switches hits some snag, whether that’s a wrong meter reading, a mismatched address, or a supplier system delay, so knowing the £40 minimum exists changes how you respond when something stalls.

Can you switch with a prepayment meter or smart meter?

Meter type shapes what’s possible far more than most people expect going in.

  • Prepayment meters and debt: you can switch even while owing money, provided the debt doesn’t exceed £500 per fuel, for a maximum of £1,000 across gas and electricity. Beyond that threshold, your current supplier can block the switch until the balance falls under the limit.
  • Debt age matters too: separately from the prepayment threshold, debt that is recent typically does not block a switch, regardless of meter type, while older debt tends to trigger a hold.
  • Smart meters: these transmit readings automatically, which should make switching seamless, but the data feed occasionally lags during a supplier transfer. Take a manual reading on switch day regardless, and keep it as a backup.
  • Economy 7 and dual-rate meters: submit both the day and night readings separately when you switch; a single combined figure gets misread by billing systems more often than you’d think.
  • Radio teleswitch meters: these older meters, mostly found on legacy Economy 7 setups, are being phased out and can restrict which tariffs you’re eligible for. If you have one, expect fewer supplier options until it’s replaced.

None of this makes switching impossible on a prepayment or legacy meter. It just means the standard “switch in five days” promise comes with more conditions attached, and it’s worth checking your specific debt figure against the £500 threshold before you apply, so a supplier doesn’t reject the switch midway through.

How do you compare tariffs so switching actually saves money?

The unit rate printed in bold on a comparison site is the least useful number for judging real savings. What actually determines your bill is the combination of unit rate, standing charge, contract length, and any exit fees, run against your genuine usage, not a generic average household figure.

Here’s a practical worked comparison. Say you use roughly 2,900 kWh a year, close to a typical UK household:

  1. Tariff A advertises a lower unit rate of 26p/kWh but a higher standing charge of 60p/day. Annual cost: (2,900 × £0.26) + (365 × £0.60) = £754 + £219 = £973.
  2. Tariff B has a slightly higher unit rate of 27p/kWh but a lower standing charge of 45p/day. Annual cost: (2,900 × £0.27) + (365 × £0.45) = £783 + £164 = £947.

Tariff B wins despite the “worse” headline rate, purely because the standing charge carries more weight for a moderate-usage household. Flip those numbers for a high-usage household and the outcome reverses. This is exactly why comparing the headline unit rate alone misleads so many switchers.

Beyond the arithmetic, weigh these factors before signing anything:

  1. Contract length. A 12-month fix protects against price rises but locks you in; a variable tariff offers flexibility but exposes you to market swings.
  2. Exit fees. Fixed tariffs often carry an early-exit charge, typically £25 to £50 per fuel, if you leave before the term ends.
  3. Payment method discount. Direct Debit customers typically pay less than those on receipt-of-bill or standard prepayment tariffs.
  4. Green credentials, if that matters to you: check whether the supplier’s “renewable” tariff is backed by genuine renewable purchasing or simply certificates bought to offset standard grid electricity.

Even with an exit fee attached, switching can still make sense. If a new tariff saves £150 a year and the exit fee on your current deal is £30, you’re still ahead within three months, and every month after that is pure saving.

Pro Tip: Pull your last 12 months of usage from a bill or online account before comparing anything. A quote based on your actual winter and summer usage beats a quote based on a national average every time.

How do you compare tariffs so switching actually saves money? — overview diagram

Switching supplier when you move house or rent

Moving home resets most of the usual switching rules, because you’re not transferring a contract, you’re starting a new supply relationship at a different address.

  • Notify your current supplier at least 48 hours before you move, so it can close your account correctly and issue a final bill based on an accurate reading rather than an estimate.
  • Take a meter reading on moving day itself, both at the property you’re leaving and the one you’re arriving at, and keep photos of both with timestamps.
  • Only the bill payer can authorise a switch. If you’re a joint tenant, whoever’s name is on the energy account is the one who needs to make the request.
  • Check your tenancy agreement before switching anything. Some landlords specify a default supplier, particularly in properties with shared or communal heating systems, and switching without checking can breach the lease terms.
  • If bills are included in rent, you generally have no grounds to switch at all, since the contract sits with the landlord, not you.
  • Set up supply at the new address promptly, even if you’re inheriting the previous occupant’s supplier by default, so you’re not stuck on a poor-value deemed contract rate longer than necessary.

Deemed contracts, the default rate you’re placed on automatically when you move in without arranging supply yourself, tend to run considerably more expensive than a tariff you actively chose. Switching away from one as soon as you’re settled is almost always worthwhile.

What to do when a switch is delayed or goes wrong

Most switches run cleanly, but when one stalls, acting quickly and keeping records makes the difference between a quick fix and a drawn-out dispute.

  1. Contact your new supplier first, not your old one. It’s the party driving the switch, and it should be able to tell you exactly where the process has stalled, whether that’s a mismatched address, an unresolved debt query, or a simple system delay.
  2. Ask directly about compensation. If the delay falls outside normal processing time, you’re likely entitled to at least £40 under Ofgem’s compensation rules, but suppliers don’t always volunteer this. Ask by name.
  3. Keep every piece of evidence. Save emails, screenshot online chat transcripts, log the dates you were told things would happen, and hold onto your meter readings and bills throughout.
  4. Put your complaint in writing if a phone call doesn’t resolve it, stating the switch date you were promised, what’s happened instead, and what you’re asking for (correction, compensation, or both).
  5. Escalate to the Energy Ombudsman if the supplier hasn’t resolved your complaint within eight weeks, or has issued a deadlock letter. The Ombudsman can order compensation and corrective action.
  6. Refer to Ofgem’s consumer guidance if you need to understand your underlying rights before escalating, since it sets the rules suppliers are required to follow.

A written complaint with dates attached moves faster through any supplier’s system than a phone call, mainly because it creates a reference point that can’t be disputed later.

Practical tips and mistakes to avoid when switching

A handful of small habits separate a smooth switch from a frustrating one.

  • Ignore the headline unit rate on its own. Run the full sum, standing charge included, against your actual annual kWh before deciding anything.
  • Check the 49-day window before your current fixed tariff ends. Switching inside this window typically avoids the early-exit fee entirely, since most suppliers waive it if you’re within 49 days of your contract’s natural end.
  • Take a dated meter reading the day the switch happens, not the week before or after, and keep a copy separate from your email inbox in case that account changes.
  • Save every communication from both suppliers during the transition, including confirmation emails and any text messages about the switchover date.
  • Double-check the tariff name, not just the supplier name, when confirming your new contract, since suppliers often run several tariffs simultaneously at very different rates.

Pro Tip: Set a calendar reminder 60 days before any fixed tariff ends. That gives enough buffer to compare deals, fall inside the fee-free 49-day switching window, and still have a few days spare if the process runs slightly long.

Why trust this guide on switching electricity supplier

This guide references UK government energy standards, including the Home Energy Model methodology set to reshape how building energy performance gets assessed under the Future Homes Standard. That grounding in regulatory detail, EPC assessment, and compliance rules extends naturally to household-level questions like supplier switching, since both sit on the same foundation of Ofgem oversight and consumer protection rules.

For readers who want to go further into the technical side of energy performance, several resources dig deeper than a switching guide can:

Every figure and rule cited here traces back to Ofgem’s published consumer guidance or established consumer advice bodies, not supplier marketing claims, which tend to present switching as simpler or riskier than it actually is depending on which way suits them.

A final word on switching, from someone who’s seen the pitfalls

Most of the anxiety around switching electricity supplier is disproportionate to the actual risk. The process is built to be low-friction, the cooling-off period genuinely protects you, and the compensation rules exist precisely because regulators know delays happen. The real cost of inaction isn’t some dramatic switching disaster. It’s the quiet, compounding waste of staying on a deemed or out-of-contract rate for years because switching felt like a chore.

The mistakes that actually bite are boring ones: forgetting a meter reading, missing the 49-day exit-fee window, or comparing headline rates without checking the standing charge. None of them are complicated to avoid.

If you take one checklist away from this guide, make it this: compare the full tariff structure, check for exit fees before you sign anything, record a dated meter reading on switch day, and confirm your switchover date in writing.

— Danny

Sources

This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.

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