Cheapest fixed energy tariff with a smart meter in the UK
See what “cheapest” really means for your home, how smart meters affect eligibility, and how to compare fixed deals fairly (unit rates, standing charges, exit fees and discounts).
- Smart meters don’t automatically unlock cheaper tariffs — prices depend on region, usage and payment method.
- Fixed tariffs can protect you from price changes, but may include exit fees and stricter eligibility.
- We’ll show you how to compare deals apples-to-apples and when a fix may not be best.
Estimates only. Availability and prices vary by postcode, meter type, payment method and supplier terms.
Fast answer: what’s the cheapest fixed tariff if you have a smart meter?
There isn’t one single cheapest fixed energy tariff across the UK — even with a smart meter. The cheapest fixed deal for you depends on your postcode (distribution region), payment method (Direct Debit vs prepayment), whether you want gas and electricity or electricity-only, and how much energy you use.
Smart meter reality check: a smart meter usually makes billing more accurate and can enable smart features (like half-hourly tariffs), but it doesn’t automatically qualify you for a cheaper fixed tariff. Many fixed tariffs are available to both smart and traditional credit meters.
What “cheapest” should mean
- Estimated annual cost for your usage
- Unit rates (p/kWh) + standing charges (p/day)
- Any discounts or cashback with conditions
When a fixed deal can help
- You value price certainty for 12–24 months
- You want to avoid price changes within the fix
- You’re happy with possible exit fees
When a fixed deal may not
- You may move home soon (tenancy / sale)
- You want flexibility to switch quickly
- Exit fees would wipe out any benefit
If you want the cheapest fixed tariff available for your situation, the fastest reliable approach is to compare using your postcode and usage (or a recent bill), then check the tariff’s unit rates, standing charges, contract length, and exit fees.
Compare fixed deals for smart meters (whole-of-market)
Tell us a few details and we’ll show fixed tariffs that may be available for your home — including estimated costs based on your usage. If you have a smart meter, you can also choose whether you want to consider smart features (where available).
What you’ll need: postcode and an email. If you have your annual usage (kWh) from a bill or online account, results are more accurate.
What we’ll compare (so you can trust the result)
- Unit rates (electricity and/or gas) and standing charges
- Contract length and whether prices are fixed or variable
- Exit fees and key eligibility checks (meter type, payment method)
- Supplier information and tariff features (e.g. green options, smart add-ons where relevant)
Not sure if you have a smart meter? If your meter has a digital screen and sends readings automatically, it’s likely smart — but we’ll still show tariffs that work for your setup.
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No obligation. We’ll email your comparison summary.
How to compare the cheapest fixed tariff (with a smart meter)
To find a genuinely cheaper fixed deal, focus on the parts of the tariff that drive your bill — and the terms that can add cost later.
1) Start with your usage (kWh)
If you can, use your annual consumption from a bill or online account. Smart meters help accuracy, but comparisons still need your expected usage to estimate annual cost.
2) Check unit rate + standing charge
A “low unit rate” can be offset by a high standing charge (and vice versa). This varies by region, so the same tariff name may cost different amounts in different postcodes.
3) Confirm it’s actually fixed
A fixed tariff usually fixes unit rates and standing charges for the contract term (subject to limited exceptions in terms). Variable tariffs can change price at any time.
4) Look for exit fees and end dates
Exit fees can matter if you move or switch early. Also note the contract end date — suppliers typically move you to a standard variable tariff after the fix ends if you take no action.
Smart meter-specific checks
- Do you have Economy 7 / multi-rate?
- If you have off-peak rates, compare using the right meter type. A single-rate fix may not suit heavy overnight use.
- Are you considering smart time-of-use tariffs?
- Some smart tariffs use half-hourly pricing and can be cheaper for certain patterns — but they’re not usually “fixed”. If you want fixed certainty, confirm the tariff structure.
- Will the supplier need half-hourly data?
- Some products require half-hourly reads. You can often change smart meter data-sharing settings; check supplier terms first.
Two realistic cost scenarios (estimated)
These examples show why “cheapest” depends on usage. Numbers are illustrative only and not live tariff prices.
Scenario A: Low-use flat (electricity-only)
- Usage: 1,800 kWh/year
- Tariff 1: 26p/kWh + 60p/day → ~£828/year
- Tariff 2: 29p/kWh + 45p/day → ~£725/year
Calculation: (kWh × unit rate) + (365 × standing charge). Standing charge can dominate at low usage.
Scenario B: Family home (dual fuel)
- Usage: 3,100 kWh electricity + 12,000 kWh gas
- Tariff 1: Elec 26p/kWh + 55p/day; Gas 7p/kWh + 32p/day → ~£1,880/year
- Tariff 2: Elec 29p/kWh + 45p/day; Gas 6.5p/kWh + 34p/day → ~£1,900/year
A slightly higher electricity unit rate can be outweighed by cheaper gas (or vice versa) depending on your split.
Tip: If you’re renting or might move, check whether exit fees apply if you switch before the end date, and whether you can transfer the tariff to a new address (often not possible, but policies vary).
Fixed vs variable vs smart time-of-use: what’s usually cheapest?
“Cheapest” can mean lowest estimated annual cost or lowest risk of price changes. This table helps you decide what to compare next.
| Tariff type | Price stability | Who it can suit | Watch-outs |
|---|---|---|---|
| Fixed (12–24 months) | High (rates usually fixed for term) | People who want predictable pricing and plan to stay put | Exit fees; may not be cheapest if market prices drop |
| Standard variable (SVT) | Medium/low (can change) | People who want flexibility; short-term stopgap | Often not the cheapest long-term; changes follow supplier pricing (and the Ofgem cap level where applicable) |
| Smart time-of-use (half-hourly) | Low/variable (price varies by time) | Homes that can shift usage (EV charging, washing at off-peak times) | Not usually “fixed”; can be expensive at peak times; requires smart meter and data sharing |
| Tracker-style (market-linked) | Low (moves with market) | People comfortable with daily/regular changes | Can spike; not a fix; suitability depends on risk tolerance |
Quick decision checklist: a fixed tariff may suit you if…
- You want predictable rates for budgeting
- You’re likely to stay in the property for the full term
- You’re happy to trade flexibility for price certainty
- The tariff is competitive on both unit rate and standing charge for your usage
A fixed tariff may not suit you if…
- You might move or change household size soon
- You expect to switch quickly if prices fall
- Exit fees would be a deal-breaker
- You’re better matched to Economy 7 / off-peak or a time-of-use product
Costs, exclusions and common pitfalls (UK)
Fixed tariffs can look cheap on headline rates, but these are the issues that most often change the outcome for UK households.
1) Exit fees (especially for renters)
Many fixed deals include exit fees per fuel. If you leave early (switch supplier or move), fees could apply. Always check tariff terms before committing.
Practical check: Multiply the exit fee by the chance you’ll move before the end date. If you’re on a 12-month fix and your tenancy ends in 6 months, a no-exit-fee option may be safer.
2) Standing charges vary by region
Standing charges can differ significantly across UK regions and suppliers. This is why a tariff that looks “cheap” nationally can be less competitive in your postcode.
3) Payment method and meter type restrictions
Some tariffs are restricted to monthly Direct Debit, or exclude certain meter setups (for example, prepayment meters or Economy 7). Smart meters don’t remove these restrictions automatically.
4) Dual fuel isn’t always cheaper
A dual-fuel deal can be convenient, but it isn’t guaranteed to be cheapest. It can be worth comparing: (a) same supplier for both fuels and (b) separate suppliers, especially if your gas or electricity usage is unusually high.
5) Smart meter comms and “dumb mode”
Occasionally, a smart meter may lose smart functionality (for example after a supplier change) and still work as a regular meter. This usually affects automatic readings, not tariff eligibility — but it may impact smart-only features.
6) Discounts and rewards with conditions
Gift cards, cashback or “reward” tariffs can be appealing, but read the conditions: eligibility windows, required payment methods, and what happens if you miss a Direct Debit.
Reminder: If you’re on a prepayment meter (including smart PAYG), tariffs and pricing can differ. Always compare using the correct payment type for accurate results.
FAQs: cheapest fixed energy tariffs with smart meters
Does a smart meter make energy cheaper in the UK?
Not automatically. A smart meter can help by giving accurate bills and better usage insight. Some smart-only tariffs exist, but many “cheap” fixed deals are available without a smart meter. Price depends more on your region, usage, and tariff terms.
Are smart time-of-use tariffs the same as fixed tariffs?
Usually not. Time-of-use tariffs often vary by time of day (and can change over time). If you’re specifically looking for a fixed tariff, confirm that the unit rates and standing charges are fixed for the whole term.
Can I get a fixed tariff on a smart prepayment meter?
Sometimes, but options can be more limited. Prices and availability can differ for prepayment. Compare using your correct meter/payment type to avoid seeing tariffs you can’t actually take.
Will switching supplier affect my smart meter?
In many cases your smart meter should remain smart, but issues can occur (for example, temporary loss of automatic readings). Even if smart functions drop, the meter should still record usage. Ask your supplier how they support your meter type.
What details do I need to find the cheapest fixed deal?
Your postcode and annual usage (kWh) for gas and/or electricity are ideal. If you don’t have kWh figures, you can use a recent bill or estimate — but your results may be less accurate.
Do fixed tariffs have exit fees in the UK?
Many do, but not all. Exit fees may apply per fuel and can vary by supplier and tariff. Always check the tariff information before you switch, especially if you might move.
Is it cheaper to fix gas and electricity together?
Not always. Dual fuel can be convenient, but the best value depends on your usage split and the supplier’s rates for each fuel. Comparing both options is the safest approach.
What happens when my fixed tariff ends?
If you don’t choose a new tariff, suppliers typically move you to their standard variable tariff. It’s worth setting a reminder to compare again before your end date.
If you’re in debt to your current supplier: you may still be able to switch, but rules and eligibility can apply (especially for prepayment). If you’re unsure, check supplier advice and independent guidance first.
Trust, methodology and sources
Editorial details
- Written by:
- EnergyPlus Editorial Team
- Reviewed by:
- Energy Specialist
- Last updated:
- May 2026
How we assess “cheapest” (transparent methodology)
- Cheapest is personalised: we treat “cheapest” as the lowest estimated annual cost for your postcode and usage, not a national headline.
- Core cost model: estimated annual cost = (annual kWh × unit rate) + (365 × standing charge), for each fuel.
- We compare like-for-like: same payment method, same meter type (single-rate vs multi-rate), and same fuels (electricity-only vs dual fuel).
- We surface key terms: contract length, exit fees, and eligibility notes that can make an apparently cheap tariff unsuitable.
Limitations: tariffs change, and final acceptance is always down to supplier checks (including meter configuration and credit/eligibility rules). Any example figures on this page are illustrative, not live prices.
UK sources we use for guidance
- Ofgem (UK energy regulator) — consumer guidance, rules and market oversight
- Citizens Advice: Energy — independent advice on bills, switching and complaints
- GOV.UK — government services and official information (including support schemes where applicable)
We also use supplier tariff information and tariff terms. If there’s a conflict, supplier terms and your contract documents take precedence.
Ready to check the cheapest fixed tariff for your smart meter?
Compare fixed deals by postcode and usage, with key terms (standing charge, unit rate, contract length and exit fees) clearly shown.
No guaranteed savings. Always review tariff details and supplier terms before switching.
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