How to switch energy supplier

Have these to hand and the comparison takes minutes:

• Your postcode — this determines which deals are available where you live.
• Your current supplier and tariff name (it's on any bill or in your supplier's app).
• Roughly how much energy you use — annual kWh figures from a bill are ideal, but an estimate is fine.
• Your bank details if you want to pay by Direct Debit, which is usually the cheapest payment method.

• Compare tariffs on a comparison site or directly with suppliers. Look at the total annual cost for your usage, not just the headline rate — and check the standing charge too.
• Pick a tariff and sign up with the new supplier. This is the only form you fill in.
• Cooling-off period: you get 14 days to change your mind with no penalty.
• Take a meter reading when your new supplier asks (usually around the switch date). This makes sure your final bill from the old supplier is accurate.
• Pay or receive your final balance. If you were in credit with your old supplier, they must refund you.

• Switching without checking exit fees: some fixed tariffs charge £30–£60 per fuel to leave early. Factor it in — sometimes it's still worth switching, sometimes not.
• Comparing only the unit rate: a cheap unit rate with a high standing charge can cost more overall, especially for low-usage households.
• Ignoring the payment method: Direct Debit tariffs are typically cheapest; prepayment and standard credit are dearer for the same energy.
• Letting a fixed deal expire without acting: you roll onto the standard variable tariff, which is almost always the most expensive option.

Check your first bill from the new supplier carefully against the tariff you signed up for. And set a reminder for when your new deal ends — the savings only stick if you switch again instead of rolling onto the default rate.