Should I switch to a gas-only tariff in the UK this month?
A practical, UK-specific guide to when a gas-only deal makes sense (and when it doesn’t), with realistic examples, pitfalls to avoid, and a quick quote form if you’re ready to compare.
- Best for homes with no electricity supply at the same supplier (or where electricity is fixed elsewhere)
- Check meter type (smart, traditional, prepay) and exit fees before switching
- Compare unit rate + standing charge, not just “monthly cost”
Prices and availability vary by postcode, meter type and payment method. Examples are estimates for guidance, not guarantees.
Fast answer: a gas-only tariff can be right — but only in specific cases
In the UK, switching to a gas-only tariff this month is usually worth considering if you either don’t want (or can’t) bundle electricity with the same supplier, or your electricity is already on a strong fix you don’t want to disturb. For many households, a dual fuel bundle isn’t automatically cheaper — it depends on the gas standing charge, the gas unit rate, and whether the supplier offers a meaningful dual fuel discount (often small or sometimes none).
Most likely to make sense
- You have electricity elsewhere (e.g. fixed electricity deal, landlord arrangement, or separate provider)
- You’re comparing gas-only fixed deals with lower standing charges in your area
- You want to simplify billing (one supplier for gas only) without changing electricity
Often not worth it
- Your supplier offers a strong dual fuel price for both fuels (compare the full rates)
- You’re on prepayment and gas-only availability is limited in your postcode
- You’d pay exit fees to break an existing gas fix
Do this first
- Find your annual gas usage in kWh (from bills/app or estimate)
- Check your tariff end date and any exit fees
- Confirm your meter type (smart/traditional, single rate; prepay if relevant)
Key point: Don’t judge by the “monthly direct debit” alone. Different suppliers set direct debits differently. Compare unit rate (p/kWh), standing charge (p/day), and the tariff type (fixed/variable) for your meter and payment method.
Compare gas-only deals (and keep your electricity as-is)
Use this quick form to see what gas-only tariffs may be available for your postcode and meter type. We’ll also show you dual fuel options where they’re genuinely competitive, so you can decide with the full picture.
What you’ll need
- Postcode
- Estimated annual gas usage (if you have it)
- Current tariff end date (optional, helps judge exit fees)
What we check
- Gas unit rate + standing charge
- Payment method (direct debit vs prepay)
- Smart/traditional meter compatibility
Tenants: You can usually switch energy supplier if you pay the bills, but check your tenancy agreement and ensure there are no landlord-managed inclusive bills. If you have debt on the meter or a prepay meter, your options may be more limited.
Get a quote
Fill in your details and we’ll match you with available home energy options. No promises on savings — just transparent comparisons.
How to decide this month (in 6 checks)
- Are you switching gas only because your electricity is already “sorted”? If your electricity is on a good fix (or you can’t change it), gas-only comparisons are often the cleanest option.
- Are you on a fixed gas tariff with exit fees? Many fixes charge exit fees per fuel. If you’re mid-fix, a “cheaper rate” may not beat the fee. Check your latest bill or account.
- What’s your meter and payment type? Direct debit tariffs can differ from prepay. Smart meters can be compatible with most suppliers, but prepay smart may have fewer options.
- Compare standing charges carefully. If your household uses little gas (well-insulated flat, heat pump, rarely use heating), the standing charge can dominate the cost.
- Check contract length vs certainty. Fixes can offer price certainty; variable tariffs move with market and price cap changes. Choose based on risk tolerance, not headlines.
- Confirm you’re comparing like-for-like. Same region, same payment method, same VAT (domestic is typically 5%), and ensure prices are shown in p/kWh and p/day.
Gas-only vs dual fuel: what actually changes?
Dual fuel sounds simpler, but the “discount” (if offered) may be small. The best choice is the one with the lowest total estimated annual cost for your usage — plus terms you’re comfortable with.
| Factor | Gas-only tariff | Dual fuel (gas + electricity) | Why it matters |
|---|---|---|---|
| Standing charges | Gas standing charge only (plus electricity elsewhere) | Gas + electricity standing charges together | If you use low energy, standing charges can dominate. |
| Discounts | No dual fuel discount | May include a small bundle discount (not guaranteed) | Always compare the full rates; don’t assume bundling wins. |
| Flexibility | You can optimise gas and electricity separately | One supplier for both fuels | Separate switching can beat bundles, especially if one fuel is already cheap. |
| Exit fees | Only relevant for the gas contract you’re leaving | Fees may apply per fuel if you leave both | A good-looking deal can be cancelled out by fees. |
| Billing | Two suppliers possible, two bills | One supplier, one account | Convenience matters — but check the price for that convenience. |
Quick checklist: gas-only is likely to suit you if…
- You’re happy keeping electricity separate (or you have to)
- You’ve checked gas exit fees (or you’re out of contract)
- You can provide (or estimate) your annual gas use in kWh
- The new gas standing charge + unit rate beats your current tariff on an annual estimate
It’s probably not for you this month if…
- You’d pay significant gas exit fees and the saving window is small
- You’re on (or need) prepay and the available gas-only choices are limited
- You want one supplier and the best-value option is a competitive dual fuel tariff
- You’re unsure who’s responsible for the bills (e.g. bills included in rent)
Reminder: Domestic energy prices vary by region (electricity distribution area / gas network factors), payment method, and meter type. Two households on the same “named tariff” can still see different rates.
Costs, exclusions and common pitfalls (UK-specific)
These are the issues that most often trip people up when switching to a gas-only tariff.
1) Exit fees and timing
If your current gas tariff is fixed, you may pay an exit fee to leave early. Some suppliers waive exit fees within a window near the end date, but terms vary. Check your tariff T&Cs or latest statement.
2) Standing charge “gotchas”
A lower unit rate can be offset by a higher standing charge — especially for smaller homes, well-insulated flats, or homes with alternative heating for part of the year.
3) Payment method differences
Prices can differ between direct debit, pay on receipt of bill, and prepayment. If you compare using one payment method but intend to pay another, the quote may not match.
4) Meter type and prepay limitations
Some tariffs are restricted to smart meters or exclude prepay meters. If you’re on prepay (including smart prepay), gas-only choices may be fewer depending on your area.
Two realistic scenarios (with numbers you can adapt)
These examples show how to calculate whether gas-only is worthwhile. They are estimates and not quotes.
Scenario A: Out of contract, medium gas use (typical house)
- Assumptions
- Annual gas use: 12,000 kWh. No exit fee. Direct debit. Rates shown include VAT (typical domestic billing).
- Current gas tariff
- Unit rate: 7.2p/kWh. Standing charge: 31p/day.
- Gas-only alternative
- Unit rate: 6.6p/kWh. Standing charge: 29p/day.
- Estimated annual cost difference
- Usage: 12,000 × (7.2p - 6.6p) = £72 saved. Standing charge: 365 × (31p - 29p) = £7.30 saved. Total estimated saving: ~£79/year, before any other factors.
Scenario B: Low gas use flat, mid-fix exit fee risk
- Assumptions
- Annual gas use: 5,000 kWh. Exit fee if leaving now: £50. Direct debit.
- Current gas tariff
- Unit rate: 6.9p/kWh. Standing charge: 27p/day.
- Gas-only alternative
- Unit rate: 6.4p/kWh. Standing charge: 33p/day.
- Estimated annual cost difference
- Usage: 5,000 × (6.9p - 6.4p) = £25 saved. Standing charge: 365 × (33p - 27p) = £21.90 extra. Net: ~£3/year saved, then subtract exit fee £50 ? ~£47 worse off in year one.
How to use this: Replace the kWh and rates with your own. If you don’t know your annual usage, use your last 12 months of bills where possible — it’s the most accurate starting point.
Other exclusions to watch for
- Warm Home Discount: eligibility is set by scheme rules; switching supplier doesn’t guarantee you’ll receive it.
- Legacy tariffs: older tariffs may have unusual structures; check the rates section on the bill.
- Moving home: you can still switch, but ensure you have the correct move-in date and opening meter readings.
- Debt on energy account: this can affect ability to switch; prepay debt rules may apply.
If you’re vulnerable or struggling to pay: contact your supplier as early as possible. You may be eligible for support, payment plans, or emergency credit (prepay).
FAQs: gas-only tariffs in the UK
Can I have gas with one supplier and electricity with another?
Yes. In Great Britain, it’s common to split fuels. You’ll have separate bills and customer service, but it can be cost-effective if one supplier is strong for gas and another for electricity.
Is dual fuel always cheaper than gas-only?
No. Dual fuel discounts aren’t guaranteed and can be small. The only reliable way to judge is to compare the full rates (unit + standing charge) and estimate annual cost using your usage.
Will switching gas affect my smart meter?
Usually not, but compatibility varies. Some smart meters operate in “smart mode” across suppliers; others may temporarily behave like traditional meters until enrolled. Your new supplier should advise what to expect.
Can I switch if I’m on a prepayment meter?
Sometimes, but options can be more limited by supplier and region. If you have debt on the meter, you may need to clear it or agree a plan first. Comparing specifically for prepay is important.
How long does a gas-only switch take?
Switching times vary by supplier and circumstances. Many switches complete within a few weeks, but delays can happen (for example, meter data issues). You should not be left without gas during a normal supplier switch.
What information do I need to compare gas-only tariffs accurately?
Your postcode, meter type, payment method, and annual gas usage in kWh (best from the last 12 months). If you’re on a fix, also check the end date and any exit fees.
Does a gas-only tariff change the Energy Price Cap?
The price cap (where it applies) limits the rates suppliers can charge on standard variable tariffs, and it varies by region and payment method. Fixed deals can be priced differently. You still need to compare the actual rates offered to you.
I’m a tenant — can I switch gas supplier?
Often yes, if you’re responsible for paying the bills and you have a standard domestic supply. If bills are included in rent or the landlord manages the account, you may not be able to switch. When in doubt, check your tenancy agreement and ask the landlord/agent.
Trust, methodology and sources
Page ownership
- Written by:
- EnergyPlus Editorial Team
- Reviewed by:
- Energy Specialist
- Last updated:
- April 2026
How we assess whether gas-only is a good idea
This guide is built around how UK domestic energy is priced and billed. When we recommend “compare”, we mean comparing on a like-for-like basis:
- Total estimated annual cost = (unit rate × annual kWh) + (standing charge × 365)
- Rates must match the user’s postcode/region, payment method and meter type
- We account for the fact that direct debit amounts are supplier-set estimates and can be misleading
- We treat exit fees as a real first-year cost if applicable
Limitations: This page can’t know your exact tariff eligibility, smart meter enrolment status, or supplier-specific discounts. Always confirm final rates and T&Cs before switching.
Ready to see if a gas-only tariff is better for you?
Get a tailored comparison based on your postcode, meter type and payment method — and decide with confidence.
Tip: If you can, have a recent bill to hand so your gas usage estimate is as accurate as possible.
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