Cheapest gas and electricity tariff in the UK (how to find it)
The “cheapest” tariff depends on your postcode, usage, meter type and payment method. Use this guide to compare whole-of-market options and see what will likely cost you least in your home.
- Clear steps to find the cheapest tariff for your property (not a generic national list)
- UK-specific pitfalls: standing charges, regional rates, smart/prepay meters, exit fees
- Two realistic cost scenarios with numbers, plus a checklist to decide fixed vs variable
Prices are estimates and change often. Availability depends on supplier, credit checks, meter type and your location.
Fast answer: the cheapest tariff is the one with the lowest estimated annual cost for your details
In the UK you can’t reliably name a single “cheapest gas and electricity tariff” for everyone because suppliers set different unit rates and standing charges by region, and deals vary by meter type (smart, standard credit, prepayment) and payment method (Direct Debit vs pay-on-receipt).
What “cheapest” usually means
- Lowest estimated yearly total (unit rates × usage + standing charges)
- After any fees (e.g., exit fees) are considered
- For your postcode + meter + payment method
Key things to check first
- Are you on a single-rate or Economy 7 electricity meter?
- Do you have a smart meter (SMETS2/SMETS1)?
- Can you pay by monthly Direct Debit?
Quick takeaway
If you want the cheapest option, focus on total cost, not just the headline unit rate. A low unit rate can be beaten by a lower standing charge depending on your usage.
Editor’s note: If you see “cheapest tariff” lists online that don’t ask for a postcode and usage, treat them as examples only. UK energy pricing is regional and personal.
Compare tariffs the right way (and why it matters)
To identify your cheapest gas and electricity tariff, you need a like-for-like comparison. Here’s the approach we use on EnergyPlus and what to have to hand.
- Start with your postcode. Regional distribution areas affect standing charges and unit rates.
- Enter household usage (kWh) if you know it. If you don’t, we can estimate from typical household patterns, but your cheapest option may change with accurate kWh.
- Confirm your meter type. Single-rate vs Economy 7 and credit vs prepayment have different prices and availability.
- Choose payment method. Some deals assume monthly Direct Debit; other payment methods can cost more.
- Compare the estimated annual total. Check exit fees, discounts, and any terms (e.g., smart meter required).
Tip: Your latest bill shows your kWh usage. Look for “electricity consumption (kWh)” and “gas consumption (kWh)”, or check your online account.
Two realistic cost scenarios (with assumptions)
Scenario A: low user (flat)
Assume electricity-only flat, single-rate, monthly Direct Debit:
- Electricity use
- 1,800 kWh/yr
- Unit rate (example)
- 24p/kWh
- Standing charge (example)
- 55p/day
Estimated annual cost: (1,800×£0.24) + (365×£0.55) ≈ £432 + £200.75 = £632.75
Why it matters: for low users, a lower standing charge can beat a slightly lower unit rate.
Scenario B: typical dual-fuel (house)
Assume dual fuel, single-rate electricity, monthly Direct Debit:
- Electricity use
- 2,900 kWh/yr
- Gas use
- 12,000 kWh/yr
- Elec unit / standing (example)
- 24p & 55p/day
- Gas unit / standing (example)
- 6p & 32p/day
Estimated annual cost: Elec: (2,900×£0.24)+(365×£0.55) ≈ £896.75
Gas: (12,000×£0.06)+(365×£0.32) ≈ £836.80
Total ≈ £1,733.55
Assumptions: example rates only; your region and supplier terms can shift totals significantly.
Get a whole-of-market quote
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Tariff types compared (what’s usually cheapest for whom)
The cheapest tariff for you often comes down to your risk tolerance and how long you plan to stay put. This table helps you choose a direction before you compare specific prices.
| Tariff type | Typical “cheapest” situation | Main risks / watch-outs | What to check |
|---|---|---|---|
| Fixed (e.g., 12 months) | Often best if you want predictable bills and you’re happy to commit for a term. | Exit fees can apply; you may miss out if prices drop. | Exit fees, end date, what happens at renewal, any smart meter requirements. |
| Variable (standard/rolling) | Can suit people who may move soon or who want flexibility to switch quickly. | Prices can increase with little notice (per tariff terms). | How often rates can change, notice period, current standing charge. |
| Tracker (linked to a reference price) | May be cheaper in periods when wholesale/reference prices fall. | Can rise quickly; not ideal if your budget can’t tolerate volatility. | What it tracks, cap (if any), exit fees, how often it updates. |
| Time-of-use (e.g., EV tariffs) | Can be cheapest if you shift usage to off-peak hours (EV charging, storage heaters). | Peak rates may be higher; needs the right meter and lifestyle. | Off-peak windows, peak unit rate, eligibility (smart meter usually required). |
Decision checklist: who the “cheapest” tariff suits (and who it doesn’t)
Likely to suit you
- You can pay by monthly Direct Debit and pass any supplier checks
- You’re staying in the property long enough to benefit from a deal term
- You have (or can get) a smart meter if the tariff needs one
- You’re comparing using kWh (or a good estimate), not just £/month
May not suit you
- You’re on prepayment and need to keep budgeting week-to-week
- You rent and can’t arrange meter changes or installations easily
- You might move soon and a fixed exit fee could wipe out benefits
- You have Economy 7 but most of your usage is in the day (single-rate could be better)
Remember: “Cheapest” can change if your usage changes (working from home, heat pump, EV). Re-check your options at least annually.
Costs, exclusions and common pitfalls (UK-specific)
These are the most common reasons a “cheap” tariff doesn’t turn out cheapest once you’re on supply.
Standing charges
You pay these daily even if you use no energy. If your usage is low, standing charges can dominate your annual cost.
Check: electricity + gas standing charge, and whether they differ by region.
Meter type & eligibility
Some tariffs are only for smart meters, Economy 7, or certain payment methods. Prepayment options can be more limited.
Check: “smart required”, Economy 7 rates, and whether prepay is supported.
Exit fees & term length
A fixed deal that looks cheapest today might be costly to leave early, especially if you move or want to switch again.
Check: exit fees per fuel, and whether they apply after a cooling-off period.
Monthly £ estimates
“£/month” figures can be based on typical use. If your household is above/below average, the cheapest deal can change.
Check: your actual annual kWh and compare by total cost.
Direct Debit assumptions
Some suppliers price more keenly for monthly Direct Debit. Paying on receipt, cash, or certain prepay methods may cost more.
Check: the tariff’s stated payment method and whether prices differ.
Dual fuel vs separate
“Dual fuel discounts” are less common than they used to be. Sometimes the cheapest total is from different suppliers.
Check: total annual cost for dual vs separate, plus admin convenience.
Don’t be caught out by VAT: domestic energy is typically charged at 5% VAT. When comparing, make sure prices are presented consistently (with VAT).
FAQs: cheapest gas and electricity tariffs (UK)
Can you tell me the single cheapest UK tariff right now?
Not reliably. UK tariffs vary by region (postcode), meter type, and payment method. The cheapest option for one household can be expensive for another once standing charges and usage are applied.
Is a fixed tariff always cheaper than a variable tariff?
No. A fixed tariff can be cheaper if its rates are lower than variable options for your details, but it can also cost more—especially if prices fall or exit fees apply and you leave early.
Do I need a smart meter to get the cheapest deal?
Not always. Many standard fixed/variable tariffs don’t require one, but time-of-use tariffs (often used for EV charging) commonly do. If you have an older Economy 7 set-up, confirm your meter and register details before switching.
What if I’m on a prepayment meter?
You can still switch in many cases, but tariff availability can be narrower and prices may differ. If you’re repaying a debt through your meter, that can affect switching options. Consider whether moving to credit (if suitable) would broaden cheaper deals.
How long does switching take in the UK?
Timings vary by supplier and meter set-up, but many switches complete within a few working days. You’ll normally have a cooling-off period, and your supply shouldn’t be interrupted during the switch.
Will I pay exit fees if I switch now?
It depends on your current tariff. Fixed deals often have exit fees per fuel; variable tariffs often don’t. Check your latest bill, online account, or tariff information before switching.
Is it cheaper to have gas and electricity with the same supplier?
Sometimes, but not always. A single supplier can be simpler to manage, while separate suppliers can occasionally be cheaper overall. The best approach is to compare on total annual cost (including standing charges).
What details do I need to compare accurately?
Postcode, meter type (single-rate/Economy 7, credit/prepay), and annual usage in kWh if possible. If you don’t know your kWh, a quote can still be produced using estimates, but it’s best to update it once you have real figures.
If you’re struggling to pay: you may be eligible for support (payment plans, grants, or priority services). See Citizens Advice guidance linked below.
Trust, methodology and sources
Page accountability
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- May 2026
How we assess “cheapest” on this page
This guide focuses on what makes a tariff cheapest in practice for UK households. Where we show numbers, they are illustrative examples to teach the calculation.
- Total cost focus: estimated annual cost = (unit rate × annual kWh) + (standing charge × 365), typically inclusive of VAT where stated by suppliers.
- UK constraints included: regional pricing differences, meter types (single-rate/Economy 7/prepay), payment method pricing and eligibility.
- What we don’t do: we don’t name a universal cheapest supplier or guarantee savings. Prices and availability change and depend on your circumstances.
- Limitations: exact costs depend on your actual kWh usage, tariff terms, and any mid-term price changes on variable/tracker deals.
Primary UK sources we reference
- Ofgem (UK energy regulator) — consumer guidance, market rules and switching protections
- Citizens Advice: Energy — help if you’re struggling to pay and switching advice
- GOV.UK — official government information and schemes when available
We recommend checking supplier T&Cs for the final word on eligibility, rates, and any fees.
Ready to see the cheapest tariff for your postcode?
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We provide estimates, not guarantees. Final prices depend on supplier confirmation and your exact meter and usage.
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