How to Switch Energy Supplier UK 2026
Switching energy supplier is one of the quickest ways to cut your household bills. Here’s everything you need to know — including how to do it in minutes.
In this guide
Can I switch energy supplier?
Yes — almost every UK household can switch energy supplier. The energy market was opened up to competition specifically so consumers could shop around for better deals.
You can switch whether you’re on a fixed tariff or a variable tariff, whether you pay by direct debit or prepayment meter, and whether you use gas, electricity or both.
The only situation where you might not be able to switch immediately is if you’re in a fixed deal with exit fees — but even then, you can usually time your switch to avoid them.
Why should I switch energy supplier?
The main reason is simple: to save money. When a fixed energy deal ends, most suppliers automatically move customers onto a standard variable tariff (SVT) — and these are almost always more expensive than the best available deals.
Millions of UK households sit on their supplier’s standard tariff for years without realising they’re overpaying. The average household can save up to £300 a year by switching to a better deal.
💡 Did you know?
If your fixed energy deal ended and you didn’t switch, you’re almost certainly on a standard variable tariff — the most expensive option your supplier offers. Check now to see if you could be saving.
How to switch energy supplier — step by step
Switching is much simpler than most people expect. Here’s the full process:
Find your current tariff
Check your latest energy bill or log in to your supplier’s app. Note down your current annual spend — this is the key number you’ll need to compare deals accurately.
Compare deals online
Use a comparison site like FastSwitch to see the best available tariffs for your postcode. Enter your postcode and monthly spend to get an instant comparison of deals from top UK suppliers.
Choose a new tariff
Pick the deal that suits you — whether that’s the cheapest fixed tariff, a green energy deal, or a flexible variable rate. Make sure to check the contract length and any exit fees before you commit.
Sign up with your new supplier
Click through to your chosen supplier and complete the sign up. You’ll need your postcode, current supplier name, and a recent meter reading. The whole process takes about 10 minutes.
Let your new supplier handle the rest
You don’t need to contact your old supplier — your new one takes care of everything. They’ll notify your old supplier and manage the switch on your behalf.
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Compare energy deals →How long does switching energy supplier take?
The sign up process itself takes around 10-15 minutes. The actual switch — when your supply transfers to your new provider — typically takes around 5 working days, though it can sometimes take up to 3 weeks.
You have a 14-day cooling off period after signing up with a new supplier during which you can cancel without penalty if you change your mind.
Will my energy supply be interrupted when I switch?
No. Your gas and electricity supply will not be interrupted at any point during the switch. The same pipes and cables deliver your energy regardless of who supplies it — only the company billing you changes.
This is one of the most common misconceptions about switching, and it stops many households from making a move that could save them hundreds of pounds a year.
What about exit fees?
If you’re on a fixed tariff you may have exit fees — typically between £20 and £60 per fuel. These are charged if you leave before your deal ends.
However, most suppliers allow you to switch without exit fees in the last 49 days of your contract. And if the savings from switching are large enough, it can still be worth paying the exit fee.
If you’re on a standard variable tariff (which most people are after a fixed deal ends) there are no exit fees at all — you can switch at any time for free.
Fixed vs variable tariffs — which is better?
This is one of the most common questions when switching energy supplier. Here’s a quick breakdown:
Fixed tariff
✓ Unit rate stays the same for the contract length
✓ Protects you if energy prices rise
✗ May have exit fees
✗ Won’t benefit if prices fall
Variable tariff
✓ No exit fees — switch anytime
✓ Prices can fall if market drops
✗ Prices can rise too
✗ Less certainty for budgeting
In general, if energy prices are low or stable, a fixed tariff gives you peace of mind. If prices are falling, a variable tariff lets you benefit from the drop.
When is the best time to switch energy supplier?
The best time to switch is as soon as your current fixed deal is within 49 days of ending — this is when you can leave without paying exit fees and lock in a new deal before your supplier moves you onto their more expensive standard tariff.
If you’re already on a standard variable tariff, the best time to switch is right now — there are no exit fees and you’re almost certainly paying more than you need to.
Check if you could save on your energy bill
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Compare energy deals →Written by the FastSwitch team · Last updated April 2026
FastSwitch is a free UK energy comparison service. We may earn a commission when you switch via our site — this never affects the deals or prices you see.