Cheapest variable energy tariff in the UK this month (explained)

What you’ll need (takes 2–3 minutes)

• Postcode (to match your electricity and gas region)
• Payment method (Direct Debit / cash or cheque / prepay)
• Meter type (smart, traditional credit, or prepayment)
• Optional: your annual usage in kWh (from a bill) for better accuracy

Decision checklist: a variable tariff often suits you if…

• You want flexibility and don’t want to pay exit fees to leave.
• You’re likely to switch again soon (e.g., waiting for better fixes).
• You’re comfortable with bills that can move up or down.
• You have a smart meter and can benefit from time-of-use (where available).

It may not suit you if…

• You need stable monthly payments and predictable budgeting.
• You’d struggle if prices rose during winter.
• You’re on a prepayment meter and need to avoid unexpected top-up increases.
• You’re considering a tracker but don’t want rapid price changes (daily/weekly).

Exclusions to watch for

• Eligibility: some variable deals are for new customers only, or require online account management.
• Smart meter requirements: time-of-use deals usually need a compatible smart meter.
• Regional differences: the same tariff name can have different standing charges across regions.
• Debt on meter: you may need to clear or transfer debt before switching (rules vary).

Common mistakes we see

• Comparing unit rate only (ignoring standing charge).
• Using the wrong payment method in comparisons.
• Assuming a tracker is “always cheaper” (it can go up as well as down).
• Not checking whether prices are single rate vs Economy 7.

Is the cheapest variable tariff always the price-capped tariff?

Not always. The Ofgem price cap limits the price of default tariffs (including many standard variable tariffs), but some discounted variable deals can price below it, while others may sit around the cap level. Your cheapest option still depends on regional standing charges, meter type and payment method.

Can a variable tariff have exit fees?

A supplier’s standard variable tariff usually has no exit fee, but some discounted variable or tracker-style tariffs can include exit fees or minimum term conditions. Always check the tariff information and key terms.

Do I need to be dual fuel to get the cheapest deal?

Not necessarily. Some homes do better buying electricity and gas from different suppliers. Dual fuel can be convenient, but the cheapest variable pricing depends on the specific unit rates and standing charges for each fuel.

Is Direct Debit always cheaper than pay on receipt of bill?

Often, yes — but it’s not guaranteed. Many suppliers price Direct Debit lower because it’s cheaper to administer. When comparing, make sure you select the payment method you will actually use.

How quickly can variable prices change?

It depends on the tariff. A standard variable tariff can change with notice, while a tracker or indexed tariff may change more frequently (depending on its rules). If you need stability, consider fixed tariffs as part of your comparison.

What if I have a prepayment meter?

Prepayment tariffs are priced differently and availability can be more limited. You can still compare, but ensure you choose the correct meter type and payment method. If you’re considering switching from prepay to credit, check eligibility and whether your supplier requires checks or a smart meter exchange.

Will switching disrupt my gas or electricity supply?

Switching supplier should not interrupt your supply in normal circumstances. Your meters and pipes/wires stay the same. You’ll typically just receive final and opening meter readings and new bills from the new supplier.

How do I compare fairly if I don’t know my kWh usage?

You can start with typical usage assumptions and refine later. For best accuracy, use a recent bill (it will list annual kWh or monthly consumption). If you have a smart meter, your in-home display or supplier app may show kWh usage too.

What “cheapest” means on this page

• Lowest estimated annual cost for your details (postcode, meter, payment method, usage).
• We consider both unit rates and standing charges.
• We treat eligibility rules (e.g., smart meter required) as part of whether a tariff is “available”.

Assumptions (when you don’t enter exact usage)

• We may use typical household consumption estimates to produce an indicative annual cost.
• We assume domestic VAT at 5% unless stated otherwise in tariff details.
• We present costs as estimates because future variable prices can change.

Limitations (important)

• Not every tariff is available in every region or for every meter type.
• Some tariffs change price frequently (especially trackers), so “cheapest” can change day-to-day.
• Promotions, account credit rules, and supplier billing practices can affect your experience beyond headline rates.