Should you switch energy supplier in the UK?
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Quick answer: Yes if you are on a standard variable tariff after the latest Ofgem cap and a 12-month fix undercuts your annual cost at your actual kWh. Switching takes about 21 days, supply is not cut off, and the new supplier runs it. Stay put if exit fees wipe the saving, you cannot pay arrears, or you will move before a new fix ends.
Energy switching changes who bills you, not your pipes or wires. After the 1 July 2026 cap reset — about 13% higher for a typical dual-fuel direct-debit home, around £1,862 a year on Ofgem's example — staying on a default variable tariff without comparing is usually the expensive option. The process is simple; the decision is whether a quoted fix beats the cap at your kWh.
Skip this if: Skip a switch if you need a hardship plan first (debt usually follows you), if you are inside a cheap fix with a high exit fee, or if you need a guaranteed engineer date this week. This is the mechanics and decision — not a live tariff list. Use an Ofgem Confidence Code comparison with figures from your bill.
Should you switch, or stay on the cap?
Switch when a quoted annual cost at your kWh is clearly below the current cap path and you want a year of certainty. Stay variable if every fix you can find is above the cap, if you may move house, or if you want the option to switch again after the next quarterly reset (October, January or April).
Headline 'typical household' savings are not yours. Read annual electricity and gas kWh from a recent bill — or estimate in our energy tariff comparator — and compare unit rates plus standing charges. Direct debit, standard credit and prepay have different cap rates.
| If this is you | Usually do this | Skip if |
|---|---|---|
| On a standard variable tariff after 1 July 2026 | Compare 12-month fixes at your kWh against the cap | You cannot pay and need a hardship plan first |
| Inside a cheap fix with months left | Wait for the last 49 days unless exit fees are tiny vs saving | A claims firm says you must switch today |
| Prepay or non-direct-debit | Filter comparison results for your payment method | You assume the dual-fuel DD typical bill applies to you |
How do you compare tariffs without a cheap headline?
Use an Ofgem-accredited whole-of-market comparison. Enter postcode, current supplier and usage from a recent bill. Compare annual cost, not unit rate alone — standing charges hit low-use homes hardest.
Read Ofgem supplier complaints data before you pick the cheapest name. A tariff that is £40 a year cheaper is not a win if billing errors take months to unwind.
What if you are already on a fix?
Leaving early usually means an exit fee — often £25–£75 per fuel on deals we have seen described, but confirm the figure on your contract. Add the fee to remaining months at current rates and compare with the new quote.
In the last 49 days before a fix ends you can usually switch without that fee. Some suppliers let you refix with them penalty-free. If your current fix still beats the live cap, stay and set a reminder for the 49-day window.
What happens during the 21-day switch?
Sign up with the new supplier. They contact the old one. You do not cancel yourself. Take a meter reading on the switch date; the old supplier sends a final bill and refunds credit. Cooling-off is 14 days after you sign the new contract.
Smart meters usually stay; the new supplier takes over the configuration. Prepay switches are allowed but the panel of tariffs is thinner — compare for prepay, not using a direct-debit typical-bill figure.
What if you cannot pay, or you are in debt?
You can usually switch if the debt is less than 28 days old. Older debts may block a switch until you agree a plan. Contact the supplier before you compare — switching does not write off arrears.
Ask about the Priority Services Register and Warm Home Discount. Free debt help is StepChange, National Debtline or Citizens Advice — not a paid claims firm.
Common questions
Will my energy supply be cut off during a switch?
No. Gas and electricity keep flowing. Only the company that bills you changes.
Should I switch if I am in debt to my current supplier?
You can usually switch if the debt is less than 28 days old. Older debts may prevent switching until you agree a payment plan. Contact the supplier first; the debt typically follows you.
Are exit fees worth paying to switch?
Only if the remaining cost on the new tariff, plus the exit fee, is still clearly cheaper than staying. If the margin is thin, wait for the last 49 days.
What is the 49-day rule?
In the last 49 days of a fixed energy contract you can usually switch without paying exit fees. Mark the end date so you do not roll onto a default variable tariff by accident.
Should I have fixed before the July 2026 cap rise?
If you were on a standard variable tariff, comparing fixes before 1 July 2026 usually made sense when a fix undercut the new cap. That window has closed for that reset — compare against the live Jul–Sep cap now, and again before the October review.
Does Money Guide earn commission if I switch?
Only if you follow a link marked * or labelled Ad. This guide is information. Use an Ofgem-accredited comparison site or go direct; we are not a supplier and we do not arrange the switch.