Cheapest gas and electricity tariff in the UK this autumn (how to find it)
There isn’t one single “cheapest” tariff for everyone—prices depend on your region, meter type and how you pay. This guide shows how to quickly identify the lowest-cost option for your home this autumn, what to watch for, and how to compare like-for-like.
- See what “cheapest” really means (unit rate, standing charge and expected annual cost)
- Understand how autumn prices can change and what to check before switching
- Compare fixed vs variable vs tracker in plain English, with realistic examples
Estimates only. Availability, eligibility and prices vary by supplier, region, meter type and payment method. Always check the tariff information label before switching.
Fast answer: the cheapest tariff this autumn is the one with the lowest expected annual cost for your home
In the UK, two households can see different “cheapest” deals on the same day. That’s because unit rates and standing charges vary by region (distribution area), meter type (credit, prepayment, smart), and payment method. The simplest way to judge value is to compare tariffs on estimated annual cost based on your usage.
Key takeaways (quick checks)
- Compare unit rate + standing charge, not just the headline discount.
- Check exit fees if you might switch again in winter.
- Confirm your meter type (prepay/smart/standard) before you compare.
- Direct Debit usually costs less than pay-on-receipt (but not always).
- Autumn deals can move quickly: availability can change daily.
What “cheapest” usually looks like
- For price certainty
- A fixed tariff with a competitive expected annual cost and reasonable exit fees.
- For flexibility
- A variable tariff with no exit fees (but prices can rise/fall).
- For risk-takers
- A tracker that moves with a published index—can be cheaper, can be more expensive.
Important: We can’t list a single “UK cheapest tariff” on this page because it would be misleading. The best approach is to run a personalised comparison using your postcode, meter type and usage.
Compare autumn tariffs for your home (whole of market)
Use your postcode and contact details to request a quote. We’ll match tariffs based on your region and meter type, then show options by estimated annual cost, so you can see what’s likely to be cheapest for you.
What you’ll need (takes 2 minutes)
- Postcode
- Contact details (to send your results)
- Optional: latest bill usage (kWh) for higher accuracy
How to spot “cheapest” in your results
- Sort by estimated annual cost.
- Compare unit rates and standing charges.
- Check tariff length and exit fees.
Tenant? You can usually switch if you pay the energy bill and have the account in your name. If you’re unsure, check your tenancy agreement and ask your landlord/agent.
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Autumn tariff types: what’s usually cheapest, and for whom
“Cheapest” depends on the trade-off you prefer: price certainty, flexibility, or the chance to benefit if the market falls. Use the table to narrow your shortlist, then compare by estimated annual cost.
| Tariff type | How the price works | When it can be “cheapest” | Key watch-outs |
|---|---|---|---|
| Fixed | Unit rates & standing charges are set for a term (often 12–24 months). | If the fixed rates are competitive for your region and you want predictable bills through winter. | Exit fees may apply. Not ideal if you expect to move soon or want to re-switch quickly. |
| Variable (standard/variable) | Supplier can change rates. Many are influenced by the Ofgem price cap (where applicable). | If you want no exit fees and the flexibility to switch again if a better fixed appears. | Prices can rise. Your “cheapest” today may not stay cheapest over winter. |
| Tracker | Rates move with a stated index (often daily/weekly/monthly), plus a margin. | If prices fall and you’re comfortable with changes, a tracker can undercut fixed/variable. | Can rise quickly. Read the tracker formula and any cap/floor carefully. |
| Time-of-use (smart) | Different unit rates at different times (e.g., cheaper overnight). | If you can shift usage (EV charging, washing, dishwasher) to cheaper periods. | Peak rates can be higher. Not always best for typical daytime-heavy households. |
Decision checklist: likely suits you if…
- You know your meter type and are comparing the right category (credit vs prepay).
- You can estimate usage (or have a recent bill) to avoid “cheap on paper” tariffs.
- You’ve checked exit fees, payment method, and any online-only requirements.
- You’re happy with the supplier’s customer service approach (digital, phone, etc.).
It may not be the right “cheapest” choice if…
- You’re likely to move home before the fixed term ends (exit fees could bite).
- You’re on prepayment and the deal is for Direct Debit credit meters only.
- You have restricted meter setups (e.g., legacy Economy 7 arrangements) and need specialist matching.
- You’re in debt to your current supplier (you may need a debt assignment process for prepay).
Two realistic scenarios (with transparent assumptions)
Scenario A: typical flat on credit meter (Direct Debit)
Assumptions: 1–2 bed flat, medium usage; electricity 2,700 kWh/year; gas 11,500 kWh/year; single-rate electricity; Direct Debit; no Economy 7; illustration only.
| Option | What changes | Estimated annual cost* |
|---|---|---|
| Variable | Flexible; rates can change | £1,560 |
| Fixed 12 months | Price certainty; may include exit fee | £1,500 |
*Example numbers to show comparison logic (not live market rates). Your region and tariff terms can change these materially.
Scenario B: family home with higher gas use
Assumptions: 3–4 bed house, higher usage; electricity 4,200 kWh/year; gas 17,000 kWh/year; Direct Debit; illustration only.
| Option | What matters most | Estimated annual cost* |
|---|---|---|
| Fixed (low unit rate, higher standing) | Gas unit rate dominates total cost | £2,240 |
| Fixed (higher unit, lower standing) | Standing charge matters less at high usage | £2,310 |
*Example numbers to highlight how usage changes what’s “cheapest”. Always compare using your own kWh where possible.
Why we show scenarios: A tariff with a lower standing charge can look “cheaper” for low-usage homes, while a lower unit rate can win for higher-usage households. That’s why a postcode-only comparison is rarely enough—usage matters.
Costs, exclusions and common pitfalls (so your “cheapest” stays cheap)
Autumn is when many households reassess before winter. These are the most common reasons a deal that looks cheapest can disappoint later.
1) Standing charge vs unit rate
A lower unit rate isn’t automatically best if the standing charge is higher (and vice versa). Always compare on estimated annual cost using your usage.
2) Exit fees and moving home
Some fixed deals charge exit fees per fuel. If you might move, check whether the tariff can move with you, or choose a no-exit-fee option.
3) Payment method differences
Direct Debit tariffs can be cheaper than pay-on-receipt. Prepayment tariffs are separate. Make sure you’re comparing within the right payment category.
4) Meter type and compatibility
Economy 7, smart time-of-use, and some legacy meter configurations can limit tariff availability. If in doubt, use your MPAN/MPRN from a bill.
5) Intro offers and extras
Gift cards, bundled services, or “new customer” extras can distract from the ongoing cost. Treat extras as a bonus, not the reason to switch.
6) Autumn timing and price changes
Some tariffs update frequently. If you’re comparing around a price cap change period, re-check rates before confirming a switch.
FAQs: cheapest gas and electricity tariffs (UK, autumn)
Is there a single cheapest energy tariff in the UK?
No. The cheapest tariff depends on your region, payment method, meter type, and how much energy you use. The most reliable way is to compare by estimated annual cost using your postcode and usage.
Do I need my usage in kWh to find the cheapest deal?
It helps a lot. You can still compare without it, but your results will be less accurate. If you have a recent bill, look for annual kWh or the last 12 months’ usage for gas and electricity.
Are fixed tariffs cheaper than variable tariffs in autumn?
Sometimes, but not always. Fixed tariffs can offer certainty for winter, but you should compare the full cost and check exit fees. Variable tariffs can be competitive and are usually easier to leave if better deals appear.
Can prepayment customers get the cheapest deals?
Prepayment tariffs can be different from Direct Debit deals, and availability varies. You can still compare and switch, but make sure you’re viewing prepayment tariffs specifically. If you’re in debt, there may be additional steps.
Will I lose supply when I switch?
Normally, no. Switching is an administrative process. Your gas and electricity keep flowing, and your meters stay in place (unless you choose a meter upgrade separately).
How long does an energy switch take in the UK?
Timings vary by supplier and circumstances, but many switches complete within days to a few weeks. If there are meter issues, debt processes, or address mismatches, it can take longer.
Does dual fuel (gas + electricity together) always work out cheaper?
Not always. Some suppliers price dual fuel competitively, others don’t. It’s worth comparing dual fuel versus separate suppliers, especially if one fuel is a much better deal elsewhere.
What should I check on the tariff information label?
Look for unit rates (p/kWh), standing charges (p/day), tariff end date, exit fees, payment method, and any eligibility criteria (online-only billing, smart meter requirements, etc.).
Trust, methodology and sources
Trust signals
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: May 2026
We focus on helping UK households compare whole-of-market options with clear explanations and practical checks—without promising a universal “cheapest” deal.
How we assess what’s “cheapest” (our approach)
- Personalisation first: “Cheapest” is determined at household level, using postcode (region) and meter/payment category.
- Like-for-like comparisons: We compare tariffs using unit rates + standing charges and present an estimated annual cost based on typical or user-provided kWh.
- Autumn relevance: We highlight factors that commonly matter in autumn—fixed-term protection for winter, exit fees, and tariff volatility.
- Practical caveats: We call out exclusions (prepayment vs credit, Economy 7/time-of-use, online-only billing) that can affect eligibility and true cost.
Limitations: Market prices and availability can change quickly. Any examples on this page are illustrative and not live tariff data. Always confirm prices, term length and fees with the supplier before you agree to switch.
Sources (UK)
- Ofgem (energy regulator) – price cap, consumer protections, switching information
- Citizens Advice: Energy – billing, switching rights, and complaints guidance
- GOV.UK – official government guidance and support schemes (where applicable)
Ready to find your cheapest tariff for autumn?
Get a personalised comparison using your postcode and details. We’ll help you judge “cheapest” based on estimated annual cost, not hype.
No guaranteed savings. Quotes are estimates and depend on your usage, region and tariff terms.
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