How to Switch Energy Supplier: UK Consumer Checklist
A supplier-neutral guide to comparing tariffs, understanding your rights and checking a switch from application to final bill.
What changing energy supplier does — and does not — change
The UK energy market allows you to choose your gas and electricity supplier. Switching means you keep the same supply through the same pipes and wires — only who sends your bill changes. The right switch can save hundreds of pounds per year.
There is no single best supplier or tariff for every household. Compare usage, payment preference, contract flexibility and service expectations alongside price.
Five checks before and after you switch
- Check your current tariff: Find your latest bill and note your annual usage, tariff name, payment method, contract end date and any exit fee.
- Compare the full cost and terms: Look at unit rates and standing charges alongside tariff type, contract length, exit fees, payment method and customer service information.
- Apply to the supplier you choose: Read the tariff summary before confirming. You will normally need your address, contact details, payment preference and meter information where available.
- Read the switch confirmation: Your new supplier arranges the transfer and confirms your expected switch date. Your old supplier is notified automatically.
- Check your final bill: Keep a meter reading when requested and check your final bill, credit refund and opening balance.
Your rights and timing
Domestic energy switches normally complete within five working days once the cooling-off period has ended, unless you ask for a later date. You usually have a 14-day cooling-off period after agreeing to a new domestic energy contract.
Consumer checks that protect you
- Exit fees: Compare the full cost of leaving your current contract against the new tariff.
- Debt and prepayment: Ask your current supplier or Citizens Advice about the rules that apply before switching.
- Smart meters: Confirm how your meter will be supported by the new supplier and keep readings if the display does not update immediately.
- Support schemes: Check the new supplier's eligibility and application process for the Warm Home Discount or other support.
Choosing a supplier is a separate decision
Use this checklist to decide whether switching is right for you. Once you have compared your options, review the exact terms, eligibility and application process of the supplier you are considering.
Frequently asked questions
Will I have any gap in supply when I switch?
No. Switching energy suppliers is seamless — your gas and electricity supply is never interrupted. The pipes and wires stay the same; only who bills you changes.
How long does an energy switch take?
A domestic energy switch normally completes within five working days after any cooling-off period. Your new supplier should confirm the planned switch date and keep you updated if anything changes.
What if I am in a fixed-rate contract?
You can switch, but first check whether your current tariff has an exit fee and when it ends. Compare the total cost of leaving with the value of the new deal.
Can I switch if I owe money to my current supplier?
Speak to your current supplier before applying. Your options depend on how you pay, the amount owed and your circumstances. Citizens Advice can explain protections that may apply.
Do I need to tell my current supplier I am leaving?
No — your new supplier handles everything. They notify your old supplier on your behalf. You just need to give a final meter reading on switch day.
What happens to credit on my current account?
Your old supplier must refund any credit balance, usually within 10 working days of your final bill.