How do I find the cheapest gas and electricity supplier for my home?

To find the cheapest supplier, compare tariffs using your postcode and current usage (kWh) for gas and electricity. Check both the unit rate (p/kWh) and the standing charge (p/day), then estimate annual cost. If you can, use your annual consumption from a recent bill—this gives the most accurate comparison before you switch.

What makes an energy tariff ‘cheap’—unit rate or standing charge?

A ‘cheap’ tariff is the one with the lowest estimated total cost for your usage. Low users often benefit from a lower standing charge, while higher users usually save more from a lower unit rate. Always compare the combined effect of both across a full year.

Is it cheaper to get gas and electricity from the same supplier (dual fuel)?

Dual fuel can be cheaper and simpler because you manage one account and may get a discount, but it’s not guaranteed. The best approach is to compare the total annual cost for dual fuel versus separate suppliers and choose the lowest overall price for your situation.

Can I switch to a cheaper supplier if I’m in a fixed-term energy contract?

You can usually switch at any time, but fixed deals may include exit fees. Check your current tariff’s end date and any exit fee amount, then compare potential savings. If the savings outweigh any fees—or if you’re within your supplier’s fee-free window near the end of the fix—switching can still be worth it.

How long does it take to switch gas and electricity suppliers in the UK?

Most UK switches complete in around 5 working days, though timings can vary. Your gas and electricity won’t be interrupted—the only change is who bills you. Take and submit meter readings (or ensure smart readings are up to date) to help ensure your final bill is accurate.

Will my energy supply be cut off if I switch?

No. Switching supplier does not interrupt your gas or electricity supply. The physical energy network remains the same—only your billing provider changes.

Do I need a smart meter to get a cheaper energy deal?

No. Many tariffs are available without a smart meter. However, a smart meter can make billing more accurate and may enable access to certain smart or time-of-use tariffs, which can be cheaper if your usage fits the pricing structure.

What details do I need to compare or switch suppliers?

You typically need your postcode and address, your current supplier and tariff (if known), your annual usage in kWh (or a recent bill), and your payment preference (Direct Debit, prepayment, etc.). If you’re switching, having your meter readings and MPAN/MPRN can also help, but they’re not always required.

How can I keep my energy bills low after switching to a cheaper supplier?

Review your tariff regularly, submit meter readings (or check smart meter connectivity), and consider fixes when rates are favourable. Reduce usage where possible (draught-proofing, thermostat optimisation, efficient appliances) and check whether time-of-use tariffs suit your routine.

Cheap gas and electricity suppliers (UK): how to find the best deal

A practical, UK-focused guide to finding cheaper energy—without falling for unrealistic headline prices. Compare tariffs by what matters: your meter, payment method, region, and how you use energy.

See what “cheap” really means for your home (unit rates + standing charges)
Understand fixed vs variable, smart vs standard meters, and exit fees
Get an estimated quote and switch with confidence (whole-of-market comparison)

Get your energy quote How to spot a genuinely cheap tariff

Estimates depend on your usage, meter type, region, payment method and tariff availability. Prices change—always check full tariff details before switching.

Fast answer: the cheapest supplier depends on you (not the headline)

In the UK, “cheap gas and electricity” usually comes down to the total annual cost for your home—which is driven by your unit rates (p/kWh), standing charges (p/day), region, meter type and payment method. The cheapest supplier for a neighbour may not be cheapest for you, even on the same street.

What to look at first

Electricity unit rate and standing charge (electricity is often the bigger bill)
Gas unit rate and standing charge (especially if you heat with gas)
Tariff type: fixed vs variable, and any exit fees

Quick ways to cut costs

Compare as a dual fuel (often simpler; not always cheaper)
Check Direct Debit pricing vs pay-on-receipt / prepay
Consider if a smart tariff suits your routine

Avoid common traps

Low unit rate but high standing charge (bad for low users)
Fixing without checking exit fees or contract end
Switching without confirming meter type (e.g., Economy 7)

Editor’s note: If you’re currently on a variable tariff, the best “cheap” option could be a competitively priced fixed deal—but only if the numbers work for your usage and the tariff terms are right. There is no single always-cheapest supplier across the UK.

Compare cheap gas & electricity deals for your postcode

Use the form to get an estimated whole-of-market quote based on your postcode and contact details. We’ll show you options you may be eligible for—then you can review tariff details (rates, standing charges, contract length and exit fees) before you decide.

You’ll usually need

Your postcode (sets regional charges)
How you pay (e.g., Direct Debit)
Your meter type (standard / smart / Economy 7 / prepay)

What “cheap” means in practice

Lower annual estimate for your usage
Rates that match how you use energy (day/night, peak/off-peak)
Terms you can live with (contract length, exit fees)

Tip: If you don’t know your exact usage, you can still compare using a reasonable estimate (for example, from a past bill or your online account). Your quote will be indicative and can be refined.

Get your quote

Fill in your details and we’ll help you compare available tariffs for your home.

How to spot a genuinely cheap tariff (UK)

1) Compare by annual estimate, not just p/kWh

A tariff can look cheap on unit rates but cost more overall if the standing charge is high. Your annual estimate combines both, using your expected kWh.

2) Check the tariff is priced for your meter & payment type

Many “best-buy” deals assume monthly Direct Debit and a credit meter. If you’re prepay or Economy 7, your cheapest options may be different.

3) Fixing can be cheaper—until you include fees

A fixed tariff can protect you from price changes, but some include exit fees. If you might move or want flexibility, a variable tariff could be better value overall.

4) “Cheapest” may be a single-fuel split

Dual fuel is convenient, but sometimes it’s cheaper to have gas with one supplier and electricity with another. The right choice depends on your usage and any supplier-specific discounts.

Remember: Availability varies by postcode and time. A tariff a friend switched to last month might not be open to new customers today.

Two realistic cost scenarios (with assumptions)

These examples show why the “cheapest supplier” varies. Figures are illustrative estimates to demonstrate the maths. Your quotes will differ by region, tariff and timing.

Scenario A: low electricity user (flat, no gas)

Assumed usage: 1,800 kWh electricity/year, no gas
Tariff 1 (low unit, higher standing): Unit 24p/kWh; Standing 70p/day
Estimated annual cost: (1,800×£0.24) + (365×£0.70) ˜ £690.50
Tariff 2 (slightly higher unit, lower standing): Unit 26p/kWh; Standing 45p/day
Estimated annual cost: (1,800×£0.26) + (365×£0.45) ˜ £632.25

For low users, standing charge can dominate. “Cheaper per kWh” may still cost more overall.

Scenario B: typical dual-fuel home (gas heating)

Assumed usage: 3,100 kWh electricity/year; 12,000 kWh gas/year
Tariff 1 (balanced): Elec 25p/kWh + 55p/day; Gas 6.5p/kWh + 30p/day
Estimated annual cost: Elec: (3,100×£0.25)+(365×£0.55)=£976.25
Gas: (12,000×£0.065)+(365×£0.30)=£889.50
Total ˜ £1,865.75
Tariff 2 (lower elec unit, higher elec standing): Elec 24p/kWh + 70p/day; Gas 6.6p/kWh + 28p/day
Estimated annual cost: Elec: £999.50
Gas: £894.20
Total ˜ £1,893.70

For higher users, unit rates matter more—but standing charges still affect the final ranking.

Caveat: These examples don’t include discounts (where available), loyalty perks, or time-of-use rates. Always compare using the tariff information shown for your postcode and meter type.

Switching basics (what usually happens)

Compare tariffs using your postcode, meter type and payment preference.
Check terms: contract length, exit fees, and any eligibility restrictions.
Apply to switch. Your new supplier normally handles the switch with your old supplier.
Provide meter readings (unless smart readings are used) so the final bill is accurate.
Confirm your new tariff and keep your account details safe.

Good to know: If you’re in a fixed tariff, check your exit fees and whether you’re within any end-of-contract window before switching.

Comparison table: which “cheap” approach fits your household?

Use this table to narrow down the type of tariff likely to be cheapest for you. Then compare specific offers using your postcode (availability varies).

If you…	Often suits	Watch out for	Quick check
Use less energy than average	Lower standing charge tariffs	Low unit rate deals with high daily charges	Compare annual estimate for your kWh
Have gas central heating	Lower gas unit rate can matter most	Exit fees if you might move	Check contract length + exit fees
Have Economy 7 / off-peak	Time-of-use or Economy 7 tariffs	Day rate may be higher; needs the right usage pattern	Estimate your day vs night split
Prefer budget certainty	Fixed tariffs (6–24 months)	Exit fees; sometimes higher than variable at certain times	Compare vs current tariff total cost
Need flexibility	Variable tariffs with no exit fees	Rates can change; may not be cheapest long-term	Check price change policy & notice

Decision checklist (quick)

Do I know my meter type (standard, smart, Economy 7, prepay)?
Am I comparing the annual estimate for my own kWh?
Have I checked standing charges (electricity and gas)?
Is it fixed or variable, and are there exit fees?
Is the tariff available for my payment method (Direct Debit vs others)?

Who this guide suits (and who it doesn’t)

Best for

UK households on domestic gas/electricity
People who want a total-cost comparison (not just “p/kWh”)
Switchers checking fees, meter types and eligibility

Not ideal for

Business energy customers
Homes on heat networks where you can’t choose a supplier
People who need immediate debt advice (see Citizens Advice)

If you’re struggling to pay, you may be entitled to support (e.g., repayment plans, grants, priority services). Start with Citizens Advice energy guidance.

Costs, exclusions and common pitfalls (UK)

A tariff can appear cheap until you account for real-world constraints. Here are the most common reasons a “cheap supplier” deal doesn’t work out.

1) Exit fees and contract terms

Fixed tariffs may charge an exit fee if you leave early. If you’re likely to move, prefer a no-exit-fee tariff or check whether moving home keeps your tariff.

Check: Exit fee per fuel, and whether it changes over the contract.

2) Standing charges (especially for low users)

Standing charges can be a large share of your bill if you use little energy (for example, a small flat or a second home). Compare tariffs using your realistic kWh, not a national average.

Check: Electricity standing charge varies by region; it’s not one UK-wide number.

3) Meter type mismatches

Economy 7, smart tariffs and prepay tariffs can have different structures. Switching to the “cheapest” standard tariff can backfire if your meter setup doesn’t match the pricing.

Check: Your tariff name and meter type on your bill or online account.

4) Payment method pricing

Many tariffs are cheapest with monthly Direct Debit. If you pay on receipt of bill or use prepayment, your available deals and pricing can differ.

5) “Green” add-ons and extras

Some tariffs include extra services (e.g., boiler cover) or renewable matching. These can be worthwhile, but compare the total cost and what’s actually included.

6) Availability can change quickly

Energy tariffs can open/close to new customers or change pricing. Treat rankings as a snapshot and always verify the current tariff details at the point you apply.

Bottom line: The “cheapest supplier” is the supplier offering the lowest total estimated annual cost for your circumstances and acceptable terms. If you only compare one price component, you can end up paying more.

FAQs: cheap gas & electricity suppliers (UK)

Who is the cheapest energy supplier in the UK right now?

There isn’t one cheapest supplier for everyone. Prices vary by postcode region, payment method, meter type and the tariff you’re eligible for. The most reliable way is to compare your estimated annual cost using your own details.

Is dual fuel always cheaper than separate suppliers?

Not always. Dual fuel can be convenient and sometimes cheaper, but you may find better value by splitting gas and electricity—especially if one supplier is strong on electricity pricing and another on gas. Compare both ways if you want the lowest total cost.

What’s more important: unit rate or standing charge?

It depends on usage. If you use less energy, standing charge can be a bigger proportion of your bill. If you use more (especially gas for heating), the unit rate usually becomes more important. Compare using an annual estimate that includes both.

Will I lose supply during a switch?

Switching supplier should not interrupt your gas or electricity supply. You’ll continue to receive energy through the same pipes and wires; only billing and customer service change.

Can I switch if I rent my home?

Often yes, if you pay the energy bills and the supply is in your name. If your landlord includes bills in your rent, or you’re on a heat network, you may not be able to choose the supplier. If you’re unsure, check your tenancy agreement or ask your landlord/agent.

Can I switch if I have a prepayment meter?

Yes, in many cases, but your available tariffs can be different. Some deals are only for credit meters or Direct Debit. If you have debt on the meter, switching may be restricted until it’s addressed. Citizens Advice can help if you’re struggling to pay.

Is it cheaper to fix or stay on a variable tariff?

It depends on the fixed deal available at the time and how long you plan to stay. Fixing can offer predictability; variable can be more flexible. Always compare the total estimated cost and check exit fees before fixing.

How do I know what meter type I have?

Your bill or online account usually shows it (e.g., standard, smart, Economy 7, prepay). Economy 7 often lists separate day/night readings or rates. If unsure, your current supplier can confirm.

Trust, methodology and sources

Page info

Written by: EnergyPlus Editorial Team
Reviewed by: Energy Specialist
Last updated: March 2026

How we assess “cheap suppliers” on EnergyPlus

We don’t publish a single universal “cheapest supplier” list because domestic energy pricing is personalised by circumstances. Instead, we help you identify the cheapest available tariffs for your home by focusing on:

Total estimated annual cost using unit rates (p/kWh) and standing charges (p/day)
Eligibility and availability by postcode region and meter/payment type
Tariff terms: fixed vs variable, contract length, and exit fees (where applicable)
Fit for usage pattern (standard vs Economy 7/time-of-use where relevant)

Limitations: Quotes are estimates and can change. Final costs depend on actual kWh used, price changes on variable tariffs, and any supplier-specific billing adjustments.

Sources we rely on (UK)

Ofgem (UK energy regulator) — regulation, consumer protections and energy market information
Citizens Advice: energy — guidance for switching, billing issues and support if you’re struggling to pay
GOV.UK — official government guidance and support schemes (where applicable)

If you think something on this page needs updating, use our comparison form and then review the tariff information shown—availability and pricing can change quickly.

Ready to check what’s actually cheap for your home?

Compare tariffs available for your postcode, meter type and payment method—then choose based on total estimated cost and fair terms.

Get your energy quote Review the checklist

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Updated on 2 Apr 2026