Switch energy supplier online: the UK step-by-step guide

Compare whole-of-market home energy deals and switch online with confidence. We explain exactly what you’ll need, what can delay a switch, and how to avoid common pitfalls (smart meters, moving home, exit fees and more).

  • Typical switching timeline: around 5 working days (can be longer in some cases)
  • No interruption to your gas/electric supply during a switch
  • Works for tenants and homeowners (with a few checks)
Get your energy quote How switching works

Estimates and availability vary by postcode, meter type and payment method. Always check tariff terms (including exit fees) before you apply.

Fast answer: how to switch energy supplier online

To switch energy supplier online, compare deals for your postcode, apply to the new supplier, and your switch usually completes in around 5 working days. There’s no supply interruption. You’ll normally need your address, payment details, and (if you have it) your current tariff and annual usage.

What you need

  • Postcode + address
  • Payment preference (Direct Debit / prepay)
  • Meter type (smart / standard / prepay)

What to check

  • Exit fees (if you’re on a fixed deal)
  • Tariff end date & price changes
  • Eligibility (e.g. prepay, smart meter mode)

What happens next

  • Cooling-off period applies
  • New supplier contacts old supplier
  • Final bill uses your closing meter readings

Quick caveat: switching time can vary if there’s a change of tenancy, debt on a prepay meter, an incorrect address/meter record, or a complex meter setup. If anything doesn’t match, your new supplier will usually ask for more details.

How switching works (UK): the step-by-step

Most online switches follow the same regulated process. Here’s what typically happens and what you should do at each stage.

  1. Compare deals for your postcode.
    Choose gas, electricity or dual fuel, plus your payment method (Direct Debit, prepay, etc.). Accurate postcode and meter details help prevent delays.
  2. Apply online with the new supplier.
    You’ll confirm address, contact details and payment. If you have them, add your current tariff name and usage (kWh) for more accurate comparisons.
  3. Cooling-off period.
    You can usually cancel within the cooling-off period without going ahead. Your supplier will explain how and when to cancel.
  4. Switch completes (often around 5 working days).
    Your new supplier takes over billing. Your energy supply stays on throughout.
  5. Send a meter reading (or allow smart reading).
    This helps produce an accurate final bill from your old supplier and a correct opening read with the new one.

Good to know: if you owe money, you can still switch in many situations, but there are extra rules for prepayment meters and certain debt arrangements. See the pitfalls section below.

Compare & switch online (quote form)

Prefer a quick start? Enter your details and we’ll show available options for your postcode. You can review tariff terms before you decide.

Start your comparison

By submitting, you confirm this is for a UK home energy comparison. We’ll use your details to provide quotes and contact you about your comparison. You can opt out at any time.

Before you switch: 60-second prep checklist

Find your usage (best)

If you can, use your annual consumption in kWh from a recent bill or your online account. If not, you can still compare using estimates.

Check your meter type

Smart meter, traditional credit meter, or prepayment? This can affect which tariffs are available and how readings are taken.

Know your contract position

If you’re on a fixed deal, check whether leaving early could mean an exit fee and whether it’s worth switching now.

Which type of energy tariff should you choose?

The “best” option depends on your risk tolerance, how long you’re staying put, and how predictable you want your bills to be. This table explains the common tariff types you’ll see when you switch energy supplier online.

Tariff type What it means Who it can suit Watch-outs
Fixed Unit rates are fixed for a set period (e.g. 12 months). Standing charges may still change depending on the contract. Households that want predictable pricing and are happy to commit for a period. Possible exit fees if you leave early; you may miss out if prices fall.
Variable Prices can change (usually with notice). Often more flexible than fixed deals. People who may move soon or who prefer flexibility over commitment. Your costs can rise; check how and when changes are applied.
Prepayment (PAYG) Pay in advance via key/card or smart prepay. Tariff availability depends on the meter and supplier. Households that need close control of spend or already have a prepay meter. Debt rules can affect switching; ensure you understand top-up method changes.
Time-of-use Different rates at different times (often used with smart meters). Good if you can shift usage. EV owners or people who can run appliances off-peak. If most of your use is peak-time, you could pay more; check your likely usage pattern.

Switching decision checklist (who it suits)

  • You’re out of contract or on a variable tariff and want to see if a better deal is available.
  • Your payment method has changed (e.g. you can move to Direct Debit).
  • You’ve had a big change in usage (new baby, working from home, EV, heat pump).
  • You want a different balance of certainty vs flexibility (fixed vs variable).

Who switching online may not suit (or needs extra care)

  • You’re in the middle of moving home (you may need a move-in process first).
  • You’re on a fixed deal with a significant exit fee (run the numbers first).
  • You’re unsure who your supplier is, or your address/meter records are inconsistent.
  • You have a complex meter setup (e.g. multiple meters, some legacy configurations).

You can still often switch—just expect additional questions during the application.

Costs, exclusions and common pitfalls (UK)

Switching supplier online is usually straightforward, but these are the issues that most commonly cause confusion, delays, or unexpected costs.

1) Exit fees (fixed deals)

If you’re in a fixed tariff, leaving early may mean an exit fee. Compare the estimated savings over the remaining term against any fee. Tariffs vary—check the supplier’s terms before you apply.

2) Direct Debit vs prepay pricing

Some deals are only available for certain payment methods. If you’re currently on prepay, switching options may be different, especially if there’s outstanding debt on the meter.

3) Smart meters and “smart mode”

A smart meter should continue to work after you switch, but in some cases it may temporarily operate like a traditional meter. Time-of-use tariffs may require a smart meter operating in smart mode—your new supplier will confirm compatibility.

4) Address and meter record mismatches

If your address is listed differently across records (flat numbering, new builds, renamed streets), the switch can stall. Use the exact address format shown on your bill if possible, and be ready to confirm your meter serial number.

Two realistic switching scenarios (with numbers)

Scenario A: fixed deal ends soon (no exit fee expected)
A household has ~3 weeks left on a fixed tariff. They compare options online using their last 12 months’ usage (kWh) and see an estimated saving of £14 per month on a new fixed deal. They choose to switch on the tariff end date to minimise risk of any exit fee and to avoid a rollover onto a higher variable rate. Assumptions: same usage and payment method; estimates only; terms vary.
Scenario B: considering switching mid-contract (possible exit fee)
A tenant has 7 months left on a fixed tariff and believes there may be a £60 exit fee. The comparison shows an estimated saving of £8 per month if they switch now. Over 7 months that’s ~£56—so switching immediately may not be worthwhile if the exit fee applies. They set a reminder to re-check closer to the end of the fixed term. Assumptions: exit fee amount and eligibility depend on the contract; estimates only.

Why we use examples like this: they show how to compare estimated savings against possible fees without relying on live unit rates (which change by postcode, meter type and supplier).

Avoid these common mistakes

  • Switching using £ spend only (kWh is more reliable for comparisons).
  • Forgetting to take a closing meter reading.
  • Not checking whether you’re mid-fix with exit fees.
  • Assuming a tariff is available everywhere—availability changes by postcode.

If you’re unsure, start a quote and review the tariff facts before applying.

Regulated protections: switching should not interrupt your energy supply. If you have concerns about your rights, see Ofgem’s guidance on switching at Ofgem consumer advice and Citizens Advice energy help at Citizens Advice: energy supply.

FAQs: switching energy supplier online

How long does it take to switch energy supplier online in the UK?

Many switches complete in around 5 working days, but it can take longer if there’s an address or meter record issue, a change of tenancy, or you’re switching a more complex meter setup. Your new supplier will keep you updated if extra checks are needed.

Will my gas or electricity go off when I switch supplier?

No. Switching changes who bills you, not the physical supply to your home, so your gas and electricity should stay on throughout. If you ever experience an outage, it’s normally a network issue rather than a switching issue.

Do I need my MPAN or MPRN to switch online?

Usually not. Most people can switch with their address and postcode. However, having your MPAN (electricity) or MPRN (gas) can help if there’s an address mismatch or multiple meters at the property. You can often find these on a bill or in your online account.

Can tenants switch energy supplier online?

Often, yes—if you pay the energy bills and the supply account is in your name. If your landlord includes energy in your rent, or your building has a shared or managed supply, you may not be able to choose the supplier. When in doubt, check your tenancy agreement or ask the bill payer.

Can I switch if I have a prepayment meter or energy debt?

You can often switch with a prepayment meter, but options may be more limited. If you have debt on the meter, extra rules may apply and you may need to agree a repayment plan. Citizens Advice explains your options at Citizens Advice: problems with your energy supply.

What meter readings should I give when switching?

Take a reading on (or close to) your switch date and submit it when requested. If you have a smart meter, readings may be sent automatically, but it’s still worth taking your own reading for your records, especially if there’s a billing dispute later.

Can I cancel after starting an online switch?

A cooling-off period usually applies. The exact length and process can vary, so check the confirmation email and terms from the new supplier. If you cancel, keep a record of dates and any reference numbers.

Is it cheaper to switch gas and electricity together (dual fuel)?

Sometimes, but not always. Dual fuel can be convenient (one supplier, one account), but the best value may be separate suppliers depending on what’s available for your postcode and meter type. Comparing both options is the safest approach.

Trust, methodology and sources

Page ownership

Written by:
EnergyPlus Editorial Team
Reviewed by:
Energy Specialist
Last updated:
July 2026

How we assess switching advice (and limitations)

  • Regulated process: we base switching steps on UK consumer switching rules and industry-standard supplier processes.
  • No invented tariffs: we do not publish supplier-specific unit rates, standing charges, or named tariffs on this page because they change frequently by postcode, meter type and payment method.
  • Examples are illustrative: scenario numbers show how to think about savings vs fees. They are not quotes and won’t match every household.
  • Availability varies: not all suppliers/tariffs are open to all customers (e.g. prepay, smart requirements, credit checks). Your quote results are the best place to confirm what’s currently available.

Editorial aim: help you switch energy supplier online safely—by explaining the real-world checks that affect speed, eligibility, and final costs.

Sources (UK)

Ready to switch energy supplier online?

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Updated on 18 Jul 2026