Cheapest gas and electricity tariff in the UK: how to find it
The “cheapest” tariff depends on your postcode, meter type and how you pay. Compare whole-of-market deals in minutes and see estimated costs before you switch.
- See estimated annual and monthly costs based on how you use energy
- Filter by fixed vs variable, smart meter, prepay and greener options
- Check exit fees, discounts and eligibility before you commit
Estimates vary by region, usage, meter type and payment method. Switching is subject to supplier acceptance and your current contract terms.
Fast answer: there isn’t one cheapest tariff for everyone
In the UK, the cheapest gas and electricity tariff for you is the one with the lowest estimated total cost for your home once you factor in:
What changes the price most
- Postcode/region (distribution charges vary across Great Britain)
- Meter type (credit, smart, prepayment; Economy 7/E10 if you have it)
- Payment method (e.g., Direct Debit vs cash/card for prepay)
- Your usage in kWh (unit rate matters more for high users)
What to do right now
- Use your last 12 months’ kWh (or your latest bill) where possible.
- Compare by estimated annual cost, not just headline unit rates.
- Check exit fees, discounts, and whether prices are fixed or variable.
- Pick the best fit for your risk preference and likely time in the property.
Important: If you’re on a fixed deal, leaving early may trigger an exit fee. If you’re in debt to your supplier, switching can still be possible, but rules differ by payment type (especially prepay).
Compare tariffs the way suppliers actually bill you
Energy bills are usually made up of:
- Standing charge (pence per day)
- Unit rate (pence per kWh used)
A tariff with a low unit rate but a higher standing charge can be best for high-usage homes, while low users often benefit from lower standing charges. That’s why we recommend comparing by estimated total cost for your usage, rather than scanning rates in isolation.
How switching works (UK)
- Get quotes using your postcode, meter type and usage.
- Choose a tariff and apply (we’ll show key terms like exit fees).
- Cooling-off applies for most distance sales (you can change your mind).
- Your new supplier arranges the switch; your energy supply stays on.
- Provide meter readings when asked so your final bill is accurate.
Timescales can vary. Smart meters may submit readings automatically, but you may still be asked to confirm readings at key points.
Get whole-of-market quotes
Tell us a few details and we’ll help you compare suitable gas and electricity tariffs. This is for home energy only.
Tip: If you can, have your latest bill to hand. It helps you compare using kWh rather than estimates, especially if your household size has changed.
Tariff types compared (what “cheapest” really means)
Use this as a quick decision aid. The best choice depends on price certainty, how long you’ll stay in the property, and whether you can meet any eligibility conditions.
| Tariff type | How prices work | Who it often suits | Watch-outs |
|---|---|---|---|
| Fixed | Unit rates and standing charges are fixed for the contract term (subject to contract terms). | Households that want predictability and plan to stay put. | Exit fees may apply; fixed doesn’t always mean the cheapest today. |
| Variable | Prices can change (often with notice) in line with supplier pricing and market conditions. | People who want flexibility or may move soon. | Your costs could rise; check how price changes are communicated. |
| Tracker | Rate tracks an index or reference price (rules differ by supplier). | More engaged bill-payers comfortable with price movement. | Can change frequently; understand the index and any caps/floors. |
| Time-of-use (e.g., Economy 7) | Different unit rates at different times (typically cheaper night rate). | Homes with storage heaters or those shifting usage overnight. | Day rate may be higher; not suitable if most usage is daytime. |
| Prepayment | Pay-as-you-go via key/card or smart prepay modes. | Those who prefer budgeting per top-up or require prepay setup. | Different tariffs and eligibility; debt rules can affect switching. |
Cheapest tariff checklist (before you switch)
- Confirm your meter type (single-rate, Economy 7, smart, prepay).
- Compare estimated annual cost using your kWh if you have it.
- Check standing charges (they can dominate low usage bills).
- Check exit fees and the contract end date of your current tariff.
- Look for conditional discounts (paperless billing, dual fuel, etc.).
- Read payment terms (Direct Debit amount review, variable DD changes).
Who a “cheapest” deal suits (and who it doesn’t)
- Often suits
- People staying at least 12 months, paying by Direct Debit, and comfortable meeting any eligibility requirements.
- May not suit
- Anyone likely to move soon (exit fees), those needing maximum flexibility, or households on Economy 7 who can’t shift usage to off-peak hours.
Two realistic scenarios (worked examples with assumptions)
Scenario A: low user in a 1-bed flat (single-rate)
Assumptions: Electricity 1,800 kWh/year. Gas 6,000 kWh/year. Two tariffs differ mainly on standing charge vs unit rate.
| Tariff (example) | Standing charges | Unit rates | Estimated annual total |
|---|---|---|---|
| Tariff 1 (lower standing charge) | Elec 45p/day + Gas 30p/day | Elec 28p/kWh + Gas 7.5p/kWh | £1,013 |
| Tariff 2 (lower unit rate) | Elec 65p/day + Gas 40p/day | Elec 26p/kWh + Gas 7.0p/kWh | £1,064 |
Despite higher unit rates, Tariff 1 comes out cheaper for a low user because the lower standing charges reduce the fixed daily cost.
Scenario B: family in a 3-bed house (higher usage)
Assumptions: Electricity 3,600 kWh/year. Gas 12,000 kWh/year. Comparing a “low standing charge” option vs a “low unit rate” option.
| Tariff (example) | Standing charges | Unit rates | Estimated annual total |
|---|---|---|---|
| Tariff 1 (lower standing charge) | Elec 45p/day + Gas 30p/day | Elec 28p/kWh + Gas 7.5p/kWh | £1,799 |
| Tariff 2 (lower unit rate) | Elec 65p/day + Gas 40p/day | Elec 26p/kWh + Gas 7.0p/kWh | £1,781 |
For higher usage, the cheaper unit rates can outweigh the higher standing charges, making Tariff 2 slightly cheaper in this example.
Example caveat: These numbers are illustrative to show the trade-off between standing charge and unit rate. Real quotes depend on your region, meter type, supplier pricing and eligibility at the time you apply.
Costs, exclusions and common pitfalls (UK)
The cheapest-looking tariff can become expensive if key details don’t match your home or circumstances. These are the most common issues we see when people compare energy.
1) Exit fees and contract end dates
Fixed tariffs can have exit fees if you leave early. Check your current plan’s end date and fees before switching, especially if you might move.
2) Payment method assumptions
Some prices are based on paying by Direct Debit. If you pay on receipt of bill or use prepay, the cheapest tariff list can look different.
3) Economy 7 and time-of-use mismatch
If you have Economy 7, a standard single-rate tariff may not be suitable. You’ll want to compare using the right meter setup and your day/night split.
4) Intro discounts and conditional pricing
Some deals include time-limited discounts or require paperless billing. Confirm what happens after any introductory period and what you must do to qualify.
5) Debt and prepayment restrictions
If you owe money, you may still be able to switch but it can be more complex—particularly for prepayment meters. Get support early if you’re struggling.
6) Standing charge focus
For low users, standing charges can be a big part of the bill. Comparing by unit rate alone can lead you to the wrong “cheapest” option.
If you’re worried about paying: You may be eligible for help such as the Warm Home Discount (if available and you meet criteria) and supplier support schemes. Independent guidance is available from Citizens Advice.
FAQs: cheapest gas and electricity tariffs
Is dual fuel always cheaper than separate gas and electricity?
Not always. Dual fuel can be convenient and sometimes includes discounts, but separate suppliers can still work out cheaper depending on rates, standing charges and eligibility. Compare both ways if you can.
What details do I need to find the cheapest tariff accurately?
Your postcode, meter type (smart/prepay/Economy 7), payment method, and ideally your annual usage in kWh from your bill. If you don’t have kWh, you can estimate, but results will be less precise.
Does a smart meter give access to cheaper tariffs?
Sometimes. Some suppliers offer smart or time-of-use tariffs that may require a smart meter. Whether it’s cheaper depends on your usage pattern (for example, how much you can shift to off-peak times).
Can I switch if I’m renting?
Usually yes, if you pay the energy bills and the supply is in your name. If bills are included in rent or you’re on a landlord’s supply arrangement, you may not be able to choose the supplier—check your tenancy agreement.
Will I be without gas or electricity when I switch?
In normal circumstances, no. The supplier changes in the background. You may be asked for meter readings around the switch date to make sure your opening and closing bills are accurate.
What if I’m on a prepayment meter?
You can still compare, but the tariff range and eligibility can differ. If you have debt on a prepayment meter, switching may be limited or require a debt repayment arrangement. Seek guidance if you’re unsure.
Are green tariffs always more expensive?
Not necessarily. Pricing varies by supplier and tariff structure. If environmental impact matters to you, compare estimated total cost and check how the supplier defines “renewable” or “green” in their tariff information.
How do I know if a tariff has an exit fee?
It should be shown in your current tariff’s terms, your online account, or on recent bills. When comparing, check the new tariff’s key features too—some fixed tariffs also charge fees if you leave early.
If you suspect your meter type is wrong (e.g., Economy 7 not recording correctly), contact your current supplier before switching so your billing setup is accurate.
Trust, methodology and sources
Editorial accountability
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist (UK domestic energy)
- Last updated
- May 2026
How we assess “cheapest”
We focus on what you’re most likely to pay in practice: estimated annual cost for your home, based on:
- Standing charge (daily) and unit rates (per kWh)
- Your postcode/region (regional cost components vary)
- Your meter type and payment method
- Tariff features that affect cost, such as discounts and exit fees
Limitations: Quotes can change and may be withdrawn. Your final cost depends on actual usage, future price changes (for variable/tracker), meter accuracy, VAT, and supplier billing practices.
Independent UK sources we reference
- Ofgem (UK energy regulator) — regulation, switching rules, consumer protections
- Citizens Advice: Energy — practical help, complaints, debt and billing guidance
- GOV.UK: Energy — official programmes and energy efficiency support overview
Where supplier-specific terms are relevant (exit fees, eligibility, smart requirements), always check the tariff’s key information before applying.
Ready to find your cheapest UK tariff?
Compare whole-of-market home energy deals using your postcode and usage. We’ll show estimated costs and key terms so you can choose with confidence.
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