How to Switch Energy Supplier in the UK: Step-by-Step Guide to Save Money

Switching your energy supplier can seem like a hassle, but it’s one of the quickest and easiest ways to reduce your household bills. With energy prices constantly shifting, failing to switch at the right time could leave you stuck on an expensive tariff.

The good news? Switching suppliers in the UK is easier than ever — often taking just minutes online. In this step-by-step guide, we’ll show you how to compare deals, avoid hidden fees, and complete your switch smoothly.

Why Should You Switch Energy Suppliers?

Most UK households could save money by switching, especially if:

• You're on a standard variable tariff

• Your fixed deal is ending

• You've been moved to a new supplier after your old one closed

• You haven't compared prices in over a year

According to Ofgem, millions of households are still overpaying due to staying on expensive default tariffs.

Step 1: Check Your Current Tariff

Before switching, find out:

• The name of your current tariff

• Your energy supplier

• Your typical usage (kWh/year for gas and electricity)

• Your contract end date and any exit fees

You’ll find this information on your energy bill or online account. This will help you compare deals accurately and avoid unexpected charges.

Step 2: Compare Energy Tariffs

Use a Ofgem-accredited comparison site or a well-known tool like MoneyHelper’s energy comparison guide.

When comparing, look at:

• Unit rate (cost per kWh for electricity/gas)

• Standing charge (daily cost)

• Estimated annual cost

• Tariff type (fixed, variable, prepayment)

• Exit fees

• Green energy options

• Customer service ratings

Read our guide on: How to Save Money on Your Utility Bills

Step 3: Time Your Switch for Maximum Savings

Best Times to Switch:

• 49 days before your fixed tariff ends – you can switch without exit fees

• When moved to a supplier after a collapse – you’re free to leave

• During periods of price stability – fixed deals can protect against future rises

• After reviewing your annual energy usage

Read our guide on: When Is the Best Time to Switch Energy Supplier in the UK?

Step 4: Choose the Right Tariff

Tariffs come in different forms — here’s how to choose what suits your needs.

Fixed Tariffs

• Price per unit is fixed for a set period (usually 12 or 24 months)

• Good for budgeting

• May include early exit fees

Variable Tariffs

• Prices can rise or fall depending on market rates

• Often no exit fees

• Ideal for flexibility

Green Tariffs

• Electricity is matched with renewable sources

• Can be competitive in price

• Good for eco-conscious consumers

Prepayment Tariffs

• Pay-as-you-go using a key or smart card

• Easy to manage, but typically more expensive

Step 5: Start the Switch

Once you’ve chosen a new supplier:

• Confirm your choice via the comparison site or supplier’s website

• Provide your personal details and current meter readings (if requested)

• Wait for confirmation — you’ll receive an estimated switch date

There’s a 14-day cooling-off period during which you can change your mind with no penalties.

Step 6: Take a Meter Reading

On or just before your switch date:

• Take a gas and electricity meter reading

• Submit it to both your old and new supplier

• This ensures accurate billing and avoids being charged for someone else’s usage

If you have a smart meter, this process is often automatic — but always double-check to be safe.

Read our guide on: What Is a Smart Meter and Should You Get One?

Step 7: Pay Your Final Bill

Your old supplier will send a final bill after the switch is complete. This should be based on your closing meter reading.

• If you’re in credit, you should receive a refund within 10 working days

• If you owe money, you’ll be asked to pay it — so budget accordingly

Keep all correspondence in case of disputes.

What If You’re in Debt to Your Current Supplier?

You can still switch if your debt is under £500 and you use a prepayment meter. For other cases, you may need to pay the balance before switching.

If you're struggling with energy debts, contact Citizens Advice or explore support via gov.uk.

Unique Tip: Align Your Energy Switch with Other Household Contracts

Plan your energy switch during a broader "bill audit" — a routine financial check where you review all key utilities and subscriptions. This saves time and helps you spot patterns, such as unnecessary subscriptions or tariff overlaps. Use the MoneyHelper Budget Planner to manage this process effectively.

Can You Switch as a Renter?

Yes — if you’re responsible for paying the energy bills, you have the right to switch.

Things to Remember:

• Let your landlord know, even if you don’t need permission

• Keep proof of any agreement if switching to a fixed deal

• Take meter readings when moving in and out

Read our guide on: How to Save on Your Utility Bills

Read our guide on: Energy Saving Tips for UK Homes

Can Students Switch Energy Suppliers?

If you're in a shared house and responsible for bills, yes — one named tenant can make the switch.

• Choose a shorter fixed tariff if the tenancy is less than a year

• Split costs using budgeting apps or direct debit agreements

• Avoid switching just before moving out

Switching for Prepayment Meters

Switching with a prepayment meter is possible, and it can help you:

• Access cheaper tariffs

• Use smart prepay top-ups

• Avoid running out of credit at inconvenient times

Some suppliers offer to upgrade you to a smart prepayment meter for easier usage and top-ups via app.

FAQs: Switching Energy Suppliers in the UK

How long does it take to switch?

Most switches take around 5 working days, and your supply will not be interrupted.

Will I be charged for switching?

Switching is free. Some tariffs have exit fees — check if you’re within the final 49 days of your contract to avoid them.

What happens if my switch is delayed?

Your new supplier will inform you if there’s a delay. You won’t be without energy, and you can still cancel within the cooling-off period.

Can I switch if I have a smart meter?

Yes. SMETS2 meters retain smart functionality when you switch. Some older SMETS1 meters may temporarily lose it but still work as standard meters.

Do I need to contact my old supplier?

No. Your new supplier handles the entire switch process, including notifying your old supplier and arranging the meter reading.

Final Thoughts: Switching Made Simple

Switching energy suppliers in the UK is quicker, easier, and more beneficial than many people realise. By comparing tariffs carefully, avoiding early exit fees, and timing your switch well, you can keep more money in your pocket — without losing a minute of power.

With no supply disruption and consumer protections in place, there’s little reason not to explore better deals. Make it a habit to review your energy plan at least once a year and switch when it makes financial sense.

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