How to Switch Energy Supplier UK: Step-by-Step Guide for 2026

How Energy Switching Works in the UK

When you switch energy supplier in the UK, your new supplier coordinates the switch with the existing supplier through the energy industry's switching infrastructure. Your gas and electricity pipes and wires do not change -- only the company that supplies and bills you changes. There is no interruption to your supply during the switch.

The Switching Process Step by Step

Step 1: Compare tariffs. Use a price comparison to identify available tariffs based on your current usage (from your bills or smart meter). Step 2: Apply to the new supplier. Provide your address, current meter readings and payment preferences. Step 3: The new supplier notifies your existing supplier. You do not need to contact your existing supplier to cancel. Step 4: A 14-day cooling-off period applies -- you can cancel the switch without penalty within 14 days. Step 5: The switch completes within 21 calendar days of confirmation.

Ofgem Rules on Switching

Ofgem, the energy regulator, sets rules governing the switching process. Under Ofgem rules, a switch must be completed within 21 calendar days. Suppliers participating in the Energy Switch Guarantee commit to additional standards including completing switches within 21 days, keeping customers informed throughout, and resolving any errors within 20 working days. Ofgem publishes supplier performance data on its website.

Exit Fees and Fixed-Term Contracts

If you are within a fixed-term energy contract (typically a 1 or 2-year fixed tariff), your supplier may charge an exit fee for switching before the contract end date. Exit fees are specified in the tariff terms and typically range from £25 to £100 per fuel. No exit fee applies in the final 49 days of a fixed contract -- Ofgem requires suppliers to allow switching without penalty during this window. Customers on variable (standard variable or default) tariffs can switch at any time without exit fees.

What to Check Before Switching

Check your current tariff end date and any applicable exit fees. Gather your annual energy consumption in kWh (from your bills or the Energy Performance Certificate). Confirm your meter type (standard, economy 7, or smart meter) as some tariffs are restricted to specific meter types. Check whether your new tariff is fixed or variable and for how long any fixed rate applies.

Frequently Asked Questions

How long does switching energy supplier take?

Under Ofgem rules, a switch must be completed within 21 calendar days of the new supplier confirming the switch. The Energy Switch Guarantee commits participating suppliers to this 21-day standard. Some suppliers complete switches faster.

Can my current supplier stop me switching?

No. Your current supplier cannot prevent you from switching to another supplier, provided you do not owe outstanding debt. If you are in credit, your existing supplier must refund the credit balance within 10 working days of the final bill.

What happens to my credit balance when I switch?

Your existing supplier issues a final bill after the switch. If you are in credit, the balance must be refunded within 10 working days of the final bill under Ofgem rules. If you owe a balance, this must be settled with your previous supplier separately.

Does switching energy supplier affect my energy supply?

No. Your gas and electricity supply continues uninterrupted during the switch. The physical pipes and wires do not change. Only the supplier and billing company changes.