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Answer: To switch energy supplier in the UK, compare tariffs with your postcode and usage, choose a deal, and sign up online. Your new supplier handles the switch — usually about 21 days for homes, with a 14-day cooling-off period and your gas or electricity supply is not interrupted.
Last updated: 11 September 2026
Who can switch?
If you pay the energy bills, you can usually switch. Tenants can switch when the tenancy makes them responsible for supply. If your landlord pays, they choose the supplier. Joint account holders should agree before switching.
Step-by-step: how switching works
- Gather a few details — postcode, current supplier (if known), payment method, and recent usage or a bill. Smart meter readings help but are not required.
- Compare tariffs — look at unit rates, standing charges, exit fees, fixed vs variable, and whether dual fuel or single fuel is cheaper for you.
- Choose a deal and apply — confirm your details online. You get a 14-day cooling-off period on most domestic switches.
- Let the suppliers handle the rest — the new supplier contacts your old one. Most home switches complete in around 2–3 weeks (often cited as about 21 days).
- Final bill — your old supplier sends a closing bill. Any debt still owes to them unless a specific scheme says otherwise.
Compare gas and electricity prices or start a comparison on EnergySwitch.
How long does a switch take?
Most domestic switches take around 21 days once you have signed up. Business switches can be quicker or slower depending on contracts and paperwork. Your supply should not cut out during a switch — energy still comes through the same network.
Will I need a smart meter?
No. You can switch with a traditional or smart meter. After a switch, some smart meters temporarily lose “smart” functionality until the new supplier reconnects them.
Fixed tariffs, exit fees and the best time to switch
If you are on a fixed deal, check the end date and any exit fee before leaving early. Many people switch when a fix ends, or if they are on a standard variable tariff (SVT) protected by the Ofgem price cap but still able to find a cheaper fix. See our guide to the energy price cap and current energy switch offers.
Prepayment meters
You can usually switch with a prepayment meter, though tariff choice may be narrower. Rules on debt can limit switching if you owe more than allowed thresholds — Citizens Advice and Ofgem explain the latest limits.
FAQs
Does switching interrupt my gas or electricity?
No. Switching is an administrative change of supplier. Power cuts are network issues, not caused by changing supplier.
Can I switch if I am in debt?
Sometimes. Small prepayment debts may still allow a switch; larger debts or credit-meter arrears often need resolving first. Check current Ofgem and Citizens Advice guidance.
What is the cooling-off period?
Most domestic customers have 14 days to cancel after signing up for a new tariff.
Should homes and businesses switch the same way?
The idea is similar, but business contracts, notice periods and letters of authority differ. Use our business energy comparison for commercial quotes.
Next step: Compare deals · Full switching FAQ · Start on EnergySwitch
