Cheapest fixed energy deal UK this week (how to find it)
Fixed tariffs can bring bill certainty — but the “cheapest” deal depends on your postcode, meter type and payment method. Use our whole-of-market comparison to see today’s estimated fixed prices for your home, with clear caveats and exit-fee checks.
- Updated guidance for England, Scotland and Wales (domestic customers)
- Shows estimated costs and key terms (unit rates, standing charges, fix length, exit fees)
- Works for credit meters and many smart/prepay set-ups (eligibility varies by supplier)
Estimates only. Availability and prices vary by region, meter type and payment method. Always check your supplier’s tariff information label and exit fees before switching.
Fast answer: the cheapest fixed deal is personal — here’s what to do
There isn’t one single “cheapest fixed energy deal in the UK” for everyone. Suppliers price by region (postcode), meter type (credit, smart, prepayment), payment method (Direct Debit vs pay on receipt) and usage. The practical way to find the cheapest fixed deal for you is to compare using your details, then sanity-check the key terms.
Key takeaway 1
Look beyond the headline monthly figure. Compare unit rates + standing charges and the fix length.
Key takeaway 2
Check exit fees and whether the tariff is available for your meter (especially prepay and some smart meters).
Key takeaway 3
If you can’t switch right now (e.g., debt on a prepay meter), you may still be able to change tariff with your current supplier.
Compare fixed deals for your home (whole of market)
Tell us the basics and we’ll show estimated fixed tariff options available for your area and meter type. You can then compare by fix length, exit fees and how the rates stack up for your usage.
What you’ll need (takes about 2 minutes)
- Your postcode (for regional pricing)
- Whether you pay by Direct Debit or on receipt
- Your meter type (credit / smart / prepay, if known)
- Optional: annual usage in kWh for gas and electricity
When a fixed tariff is usually a good fit
- You prefer predictable rates for 12–24 months
- You can afford a possible exit fee if you need to leave early
- You’re not expecting major changes (moving home, renovations, heat pump install)
Get your fixed tariff quote
We’ll use your details to show available options and contact you only about your comparison and switch support.
Compare fixed deals properly (not just by “£/month”)
Suppliers can look cheap on a low-use household but cost more for higher usage (or vice versa) because of the trade-off between unit rates and standing charges. Use the table below as a quick decision guide, then check your personalised results.
| What you’re comparing | What “cheap” usually looks like | Why it matters | What to check |
|---|---|---|---|
| Unit rate (p/kWh) | Lower than alternatives for your fuel(s) | Has the biggest impact if you use a lot of energy. | Electricity and gas rates separately; day/night if Economy 7. |
| Standing charge (p/day) | Lower standing charge (but not always) | Costs you even if you use very little energy. | Regional differences can be large; compare like-for-like. |
| Fix length | Often 12 months for flexibility; 24 months for longer certainty | Longer fixes can protect you if prices rise but can hold you back if prices fall. | What happens at end of fix (SVT/variable rollover). |
| Exit fees | Low or none (but many fixes have them) | A “cheap” fix can become expensive if you need to leave early. | Fees per fuel; what counts as “leaving” (moving, switching supplier). |
| Payment method | Direct Debit is often cheaper than pay-on-receipt | Some deals are only available on Direct Debit. | Any requirements (paperless billing, smart meter needed). |
Decision checklist: who a “cheapest fix” suits
- You’re staying put for the fix term
- You can manage a credit check if required by the supplier
- You’re comfortable with possible exit fees
- You prefer price certainty over flexibility
Who it may not suit (or needs extra checks)
- You may move home soon (exit fees can apply)
- You have Economy 7 / complex metering and need the right tariff shape
- You’re on prepayment and your options are more limited (varies by supplier)
- You’re in debt to an energy supplier and may face switching restrictions
Costs, exclusions and common pitfalls (UK-specific)
A fixed tariff can look like the cheapest deal this week but still be the wrong choice once you factor in eligibility and real-world usage. Here are the main gotchas to watch for before you commit.
1) Exit fees can wipe out the benefit
Many fixed tariffs charge a fee per fuel if you leave early. If you might move or want the option to re-switch quickly, prioritise low exit fees or shorter fixes.
2) “Cheap” for one household isn’t cheap for another
A low standing charge can help low users; a low unit rate helps high users. Always compare using your best estimate of annual kWh.
3) Meter type limits availability
Prepayment and some older Economy 7 setups can have fewer fixed options. Smart meters can expand options, but some tariffs may require them.
4) Direct Debit assumptions
Most “cheapest” quotes assume Direct Debit. If you pay on receipt, expect fewer deals and higher rates. Always match your actual payment method.
5) Dual fuel vs single fuel
Dual fuel can be convenient, but not always cheapest. If you’re all-electric (no gas), compare electricity-only options.
6) Time-of-use tariffs
If you have Economy 7 or EV charging needs, a standard fixed tariff may be “cheap” on paper but cost more if you rely on off-peak rates.
Two realistic scenarios (with numbers)
These examples show how “cheapest” can change with usage. They are illustrative only and not a promise of available tariffs.
Scenario A: Low-use flat (single occupant)
- Assumed usage:
- 1,600 kWh electricity/year, no gas
- Tariff 1 (low standing charge):
- 30p/kWh + 35p/day
- Tariff 2 (low unit rate):
- 27p/kWh + 65p/day
- Estimated annual cost:
- Tariff 1 ≈ £607; Tariff 2 ≈ £855
Why: with low usage, the standing charge difference dominates.
Scenario B: Family home (gas + electricity)
- Assumed usage:
- 3,100 kWh electricity/year + 12,000 kWh gas/year
- Tariff X (lower unit rates, higher standing):
- Elec 25p/kWh + 65p/day; Gas 6.2p/kWh + 35p/day
- Tariff Y (higher unit rates, lower standing):
- Elec 27p/kWh + 45p/day; Gas 6.8p/kWh + 25p/day
- Estimated annual cost:
- Tariff X ≈ £1,703; Tariff Y ≈ £1,793
Why: at higher usage, lower unit rates can outweigh standing charges.
Math notes: annual cost ≈ (kWh × unit rate) + (standing charge × 365). Rates shown are examples only and not tied to a specific supplier.
Common exclusions that stop a “cheap” switch
- Prepay restrictions: some suppliers don’t accept new prepayment customers, or only accept smart prepay.
- Debt: you may be blocked from switching if you owe your current supplier above a threshold; support options exist.
- Complex meters: Economy 7, related MPANs, or legacy setups can need specialist tariffs.
- Credit checks: some deals require them; outcomes vary.
- Warm Home Discount / priority services: switching can affect how/when support is applied (check supplier details).
Useful next step: compare two or three fixed deals and one variable/SVT option side-by-side, then choose based on your risk preference and likely time in the property.
FAQs: cheapest fixed energy deal (UK)
What does “fixed” actually mean?
Your unit rates and standing charges are set for a period (often 12–24 months). Your monthly Direct Debit can still change if your supplier reviews your usage or if you build up credit/debit.
Is the cheapest fixed deal always below the Ofgem price cap?
Not always. The price cap limits what suppliers can charge on default tariffs (SVT) for typical usage — it doesn’t cap fixed tariffs. Some weeks, fixed deals beat SVT; other weeks they may not.
Can I switch if I’m on a prepayment meter?
Sometimes. Options depend on whether you have traditional prepay or smart prepay, and supplier acceptance criteria. If you have energy debt, switching can be restricted. It’s still worth comparing because availability changes.
How long does a switch take in the UK?
Many switches complete within a few working days, but timings vary. You should not be left without energy; the supply stays on during the switch. If you’re moving home, timings and processes can differ.
What should I check before choosing a fixed tariff?
At minimum: unit rates, standing charges, tariff length, exit fees, payment method, and meter eligibility. If you have Economy 7, check both day and night rates.
Will my Direct Debit definitely go down if the tariff is cheaper?
Not necessarily. Direct Debits are set to spread costs over time and may be adjusted if your account is in debit/credit or your usage changes. Focus on the annual estimated cost and rates, not just the monthly payment.
Do fixed tariffs include VAT?
Domestic energy prices are typically shown inclusive of 5% VAT. Always confirm how prices are presented on the tariff information label or supplier documentation.
Can I switch if I’m renting?
Usually yes if you pay the energy bills and have an individual meter. If bills are included in rent, you typically can’t choose the supplier. If you’re in a block with communal heating, switching may not apply.
How we assess “cheapest fixed energy deal this week” (methodology)
Because prices differ by region and household, our editorial view of “cheapest” focuses on lowest estimated annual cost for a given set of inputs, with transparency about what can change that result.
Inputs we use (what changes the answer)
- Postcode / region (regional network costs affect standing charges and rates)
- Fuel type (electricity-only vs dual fuel)
- Meter type (credit, smart, Economy 7, prepay where supported)
- Payment method (Direct Debit vs other methods)
- Usage (kWh) where provided; otherwise a typical-use estimate for comparison
What we look for in a “good” cheap fixed deal
- Competitive estimated annual cost for the inputs above
- Clear unit rates and standing charges (including VAT where applicable)
- Exit fees clearly stated and proportionate to the fix length
- Tariff terms that match the user (e.g., Economy 7 rates where needed)
Limitations and editorial caveats
- Prices move: suppliers can change tariffs at short notice; “this week” reflects the most recent check and market availability.
- Eligibility varies: credit checks, meter requirements and payment methods can change which deals you can take.
- Estimates depend on usage: if your kWh estimate is off, the “cheapest” ranking can change.
- Not financial advice: we provide comparisons and explanations; you should check full tariff terms before committing.
Trust signals
- Written by:
- EnergyPlus Editorial Team
- Reviewed by:
- Energy Specialist
- Last updated:
- May 2026
Sources we rely on for consumer rules and guidance:
- Ofgem (Great Britain energy regulator) — price cap, switching rules, consumer protections
- Citizens Advice energy guidance — billing problems, debt and help if you can’t pay
- GOV.UK — official consumer and support information (where applicable)
See the cheapest fixed deal available for your postcode
Get a personalised comparison with rates, standing charges, fix length and exit-fee checks — then decide with confidence.
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