Cheapest gas and electricity deal in the UK (how to find it)
The “cheapest” energy tariff depends on your meter, payment method, region and usage. Use this guide to find the lowest estimated cost deal for your home, with clear caveats and a transparent method.
- See what actually makes a deal cheapest (unit rates, standing charges and fees)
- Compare like-for-like with realistic UK scenarios and a decision checklist
- Get a quote with whole-of-market comparisons (where available) and switch support
Prices shown are estimated examples only. Availability and rates vary by postcode, meter type, payment method and credit checks. Switching timelines and exit fees may apply.
Fast answer: what’s the cheapest gas and electricity deal?
There isn’t one single “cheapest” UK energy tariff for everyone. The cheapest deal for your home is the tariff with the lowest estimated annual cost for your postcode after factoring in:
- Unit rates (pence per kWh) for gas and electricity
- Standing charges (pence per day) for each fuel
- Tariff type (fixed vs variable vs tracker), and any eligibility rules
- Meter type (credit/prepayment/smart meter, and time-of-use where relevant)
- Payment method (monthly direct debit is often cheapest, but not always)
- Fees (exit fees, late payment charges, paper bill fees)
If you want the lowest predictable cost
Compare fixed tariffs on estimated annual cost, then check exit fees and what happens when the fix ends.
If you might move home soon
A no-exit-fee option can be cheaper overall if you’d otherwise pay to leave early.
If you have a smart meter & can shift usage
A time-of-use tariff may be cheaper, but only if you can use power in off-peak windows.
Key takeaway: “Cheapest” is a maths problem. The right comparison is annualised cost for your home (unit rates + standing charges + fees), not a headline unit rate on its own.
How to find the cheapest deal for your home (step-by-step)
- Gather the basics: your postcode, whether you pay by direct debit or prepayment, and (if you can) your annual usage in kWh for gas and electricity.
- Check your meter setup: single-rate electricity (most homes), Economy 7/Economy 10, smart time-of-use, or prepayment. This determines which tariffs you can access.
- Compare on estimated annual cost, not just unit rate. A tariff with a low unit rate but high standing charge can cost more overall depending on usage.
- Look for deal “gotchas”: exit fees, price guarantees, discounts that end, and what happens after the fixed term.
- Check eligibility: some tariffs are for smart meters only, some require a credit check, and some aren’t available in every region.
- Switch with a clear start date and keep records. Take meter readings on switch day and save your confirmation emails.
Tip: If you don’t know your kWh usage, you can still compare using typical usage estimates. It’s less precise, but it’s usually enough to shortlist the best few options—then refine once you find your actual kWh on a bill or online account.
Two realistic scenarios (with numbers)
These examples show why the “cheapest” deal depends on how much energy you use. They’re illustrative only (rates vary by supplier, tariff, region and time).
Scenario A: low usage flat
Assumptions: single-rate electricity, monthly direct debit, low usage (electricity 1,800 kWh/yr, gas 6,000 kWh/yr).
For low users, standing charges can dominate, so the cheaper deal is often the one with lower daily charges, even if unit rates are a bit higher.
Scenario B: family home (higher usage)
Assumptions: single-rate electricity, monthly direct debit, higher usage (electricity 4,200 kWh/yr, gas 15,000 kWh/yr).
For higher users, unit rates matter more, so a tariff with a higher standing charge can still win if the per-kWh rate is meaningfully lower.
Get your cheapest deal shortlist
Tell us a few details and we’ll compare tariffs available for your home. We’ll use your information to provide a quote and help you switch if you choose to.
Important: If you have a prepayment meter, Economy 7, or a smart time-of-use tariff, tell us when we contact you (or include it in any notes if available in your journey). Tariff availability can change based on meter type.
What you’ll need (takes 2 minutes)
- Your postcode
- Payment method (direct debit / cash or cheque / prepayment)
- Approximate usage (optional but helpful)
- Your current supplier and tariff name (if known)
Compare tariff types (what’s usually cheapest and why)
When people search for the cheapest gas and electricity deal, they often mean one of these. Use the table to choose what to compare first.
| Tariff type | How pricing works | Best for | Watch-outs |
|---|---|---|---|
| Fixed | Unit rates and standing charges are set for a term (e.g. 12 months). | Budgeting and price certainty. | Exit fees; may not benefit if market prices drop; check end-of-fix rates. |
| Variable | Prices can change (supplier terms apply). Standard Variable Tariffs (SVTs) are typically capped by Ofgem’s price cap. | Flexibility; short-term stopgap. | Can rise; “cheap today” may not stay cheap; check notice periods. |
| Tracker | Follows a published index (often daily/weekly), plus a margin. | People comfortable with price movement who want transparency. | Bills can change frequently; may not suit fixed incomes; check caps/guards if any. |
| Time-of-use (smart) | Different electricity rates at different times (e.g. overnight/off-peak windows). | EV charging, storage heaters, flexible households. | Not cheapest if you can’t shift usage; check peak rates carefully. |
Cheapest-deal checklist (use before you switch)
- Compare annual cost for your postcode (not national averages).
- Confirm meter type: single-rate vs Economy 7 vs prepayment vs smart time-of-use.
- Check standing charges—especially important for low usage homes.
- Check exit fees and whether you’re likely to move or switch again soon.
- Understand payment method: direct debit vs receipt of bill vs prepay affects prices.
- Read the end-of-tariff outcome: what rate will you move to when the fix ends?
Who the “cheapest deal” approach suits (and who it doesn’t)
- It suits you if…
- …you can provide a postcode and basic meter/payment details, and you’re happy to compare based on estimated annual cost.
- It may not suit you if…
- …you’re on a complex setup (e.g. multiple meters, restricted meters, communal heating, or you need specialist advice due to debt/repayment plans). In these cases, focus on suitability and support features—not just headline price.
Costs, exclusions and common pitfalls (UK-specific)
These are the most common reasons a “cheap” tariff quote doesn’t match what you end up paying. Use the cards below as a quick sense-check.
Standing charges vs unit rates
A tariff can look cheap on unit rates but cost more overall if standing charges are high—especially for low usage homes or empty properties.
Exit fees and moving home
Fixed tariffs may charge exit fees if you leave early. If you expect to move, compare no-exit-fee options or shorter fixes.
Payment method differences
Some suppliers price differently for direct debit vs pay on receipt of bill. Prepayment rates can differ again.
Meter type limitations
Economy 7, smart time-of-use and prepayment meters can restrict tariff options. Always confirm your meter type before switching.
Regional pricing
Standing charges and unit rates vary by distribution region. A deal that’s cheapest in one area may not be cheapest in another.
Discounts that don’t last
Some offers include time-limited discounts or perks. Compare the underlying rates and what you’ll pay after any promo ends.
Reality check: the cheapest tariff isn’t always the “best” tariff for every household.
- If you’re worried about missing payments, prioritise manageable direct debits and support features.
- If you rely on electric heating or have medical needs, prioritise service quality and stability as well as price.
- If your usage is uncertain (new home, renovations), choose a tariff with low fees and flexibility.
FAQs: cheapest gas and electricity deals (UK)
Is there a single cheapest energy supplier in the UK?
Not reliably. Prices vary by postcode (region), meter type, payment method and the specific tariff. A supplier can be cheapest for one household and not for another.
What matters more: unit rate or standing charge?
Both. Low usage homes often feel standing charges more; high usage homes are more sensitive to unit rates. The fairest comparison is estimated annual cost using your kWh.
Are fixed tariffs always cheaper than variable?
No. Fixed tariffs can be cheaper or more expensive depending on market conditions and supplier pricing. Fixed is mainly about certainty; variable can be useful for flexibility, but prices may change.
Can I switch if I’m renting?
Usually, yes—if you pay the energy bills and your tenancy allows it. You typically can’t change the meter type (e.g. remove prepayment) without permission, but you can often change supplier. If in doubt, check your tenancy agreement or ask your landlord/letting agent.
Will switching affect my credit score?
Some tariffs (especially pay-monthly direct debit) may involve a credit check. The impact varies by supplier and your circumstances. If you want to avoid credit checks, ask about tariff options that don’t require one (availability varies).
What if I’m on a prepayment meter?
You can still compare and switch, but the range of tariffs can be smaller and prices can differ. It’s important to select “prepayment” in comparisons and confirm whether your meter is smart prepay or traditional key/card.
How long does an energy switch take in the UK?
Many switches complete in a few working days, but timelines can vary if there are meter issues, address matching problems, or if your supplier needs extra checks. Take meter readings on the day the switch completes to reduce billing issues.
What is Ofgem’s price cap and does it mean I can’t get a cheaper deal?
The price cap limits the maximum rates for certain default tariffs (like many Standard Variable Tariffs) for typical payment methods and regions. Suppliers can still offer fixed or other tariffs below (or above) those levels, depending on their pricing and the tariff terms.
What should I do if I’m in debt to my current supplier?
Switching can be more complex if you’re repaying debt—especially on prepayment. Get advice first and ask about options. Trusted help is available from Citizens Advice and Ofgem guidance.
Trust, methodology and editorial standards
How we assess what’s “cheapest”
In this guide, “cheapest” means the lowest estimated annual cost for a household, calculated from:
- Electricity unit rate (p/kWh) × estimated annual electricity usage (kWh)
- Gas unit rate (p/kWh) × estimated annual gas usage (kWh)
- Standing charges (p/day) × 365 days (for each fuel)
- Known fees where applicable (e.g. exit fees if you expect to leave early)
Limitations (please read):
- Quotes are estimates until your meter details and supplier eligibility are confirmed.
- Rates can change and tariffs can be withdrawn at short notice.
- Time-of-use tariffs depend on when you use electricity; “annual cost” can vary widely by behaviour.
- If you’re on an unusual meter, have multiple registers, or have debt arrangements, you may need tailored advice before switching.
Sources (UK)
- Ofgem (UK energy regulator)
- Citizens Advice: energy supply and switching
- GOV.UK (official UK government information)
Our promise: we aim to explain pricing clearly, show assumptions, and highlight when a “cheap” tariff may not be suitable for every household.
What to do if you need extra help
If you’re struggling to pay, you may be eligible for support such as payment plans, emergency credit (prepay), or grants (eligibility varies). Citizens Advice can help you understand your options.
Ready to check the cheapest deal for your postcode?
Get an estimated annual cost comparison based on your home’s details. No jargon—just clear numbers, key terms and next steps.
Reminder: The cheapest deal is the one that’s cheapest for your usage, meter and region. If anything looks unclear, ask before you switch.
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