Fix and fall energy tariffs in the UK: compare & estimate savings
A clear, UK-focused guide to how fix-and-fall tariffs work, who they suit, and how to compare them against fixed and flexible deals—based on your meter, region and payment method.
- Understand the key feature: prices can go down—but usually won’t go above a cap
- See realistic examples (with assumptions) to estimate whether it’s worth it for you
- Compare tariffs on like-for-like terms (unit rates, standing charges, exit fees, cap level)
Estimates only. Tariff availability, rates and caps vary by region, meter type and payment method. Always check the tariff information label before you switch.
Fix-and-fall tariffs: the fast answer
A fix-and-fall tariff is a type of energy deal where your unit rates and/or standing charges can reduce if the supplier’s prices drop, but they’re typically protected by a cap (so they shouldn’t rise above a stated maximum during the term).
Important: “Fix and fall” isn’t a formal Ofgem tariff category. Suppliers may use different wording and the protection may apply to unit rates only, or include standing charges. Always verify what’s capped in the tariff details.
Key takeaways (UK-specific)
What you gain
Potential to benefit if prices fall during your term, without needing to re-switch every time.
What to watch
Exit fees, the level of the cap, and whether the protection applies to both electricity and gas.
When it’s useful
If you want some certainty vs a flexible tariff, but don’t want to miss out if market prices drop.
If you’re unsure, compare the estimated annual cost of: (1) fix-and-fall, (2) standard variable/flexible, and (3) a fixed tariff—then check the fine print on cap level, exit fees, and eligibility for your meter and payment method.
Compare fix-and-fall tariffs (and alternatives) in minutes
Energy prices in the UK vary by region, meter type (including smart and prepayment), and payment method. The easiest way to judge whether a fix-and-fall deal makes sense is to compare it against other available tariffs for your home on a like-for-like basis.
What we’ll use your details for: to return whole-of-market domestic tariff options where available and contact you about your quote. Your usage and tariff options may be estimated if you don’t have a recent bill to hand.
What to have ready (optional, but helps accuracy)
- Your postcode (sets your distribution region and rates)
- Whether you’re credit (monthly Direct Debit) or prepayment
- Your meter type (single-rate, Economy 7, smart, prepay)
- Any current exit fee and tariff end date (if you’re fixed)
Prefer to read first? Jump to how to compare fix-and-fall tariffs for the exact checks we recommend.
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UK homes only. Fields marked optional can be left blank.
How to compare fix-and-fall tariffs properly (UK checklist)
1) Confirm what’s capped
- Unit rates (p/kWh) for gas and electricity
- Standing charges (p/day) — sometimes excluded
- Whether the cap applies to both fuels if dual fuel
2) Compare total annual cost (not just unit rates)
Standing charges can materially change the outcome, especially for low users or small flats. Ask: “What’s my estimated annual cost at my usage?”
3) Check your eligibility
- Payment method: monthly Direct Debit vs prepayment
- Meter type: single-rate, Economy 7, smart, prepay
- Region (your postcode affects rates)
Tip: If you’re on Economy 7 (or another multi-rate set-up), make sure any comparison uses your day/night split. A great headline day rate can still cost more if the night rate or standing charge is higher.
Fix-and-fall vs fixed vs flexible: what’s different?
Use this as a practical decision aid. Exact terms vary by supplier and tariff—always check the tariff information label and key terms before switching.
| Feature | Fix-and-fall | Fixed | Flexible / SVT |
|---|---|---|---|
| Price movement | Can go down; usually capped so it can’t exceed a stated maximum | Typically stays the same for the fix term (unless contract allows changes) | Can go up or down with supplier changes; often linked to Ofgem price cap level |
| Certainty | Medium: protected above a cap, but not necessarily “fully fixed” | High (for covered charges) | Low–medium |
| Exit fees | Often yes (check per fuel) | Common | Usually none |
| Best for | People who want some protection but don’t want to miss potential falls | Budgeting and stability | Short-term flexibility; switching quickly when a better deal appears |
| Watch-outs | Cap may not include standing charges; “falls” may be discretionary or delayed | If market prices fall significantly, you may pay more unless you switch (and exit fees may apply) | Rates can rise; can be costly if increases happen before you act |
Quick decision checklist
- A fix-and-fall tariff may suit you if…
- You want protection from price spikes but you’d like the chance to benefit if prices reduce during your term.
- It may not suit you if…
- You need to switch often (exit fees), you’re on prepay and options are limited, or the cap is close to (or above) what you’d pay on a competitive fixed tariff.
Two realistic scenarios (with numbers)
These examples show how outcomes can change. They are illustrative and not a prediction. Assumptions are listed so you can adapt them.
Scenario A: medium-use dual fuel on monthly Direct Debit
- Usage: 2,900 kWh electricity + 12,000 kWh gas / year
- Current flexible estimated annual cost: £1,780
- Fixed tariff estimate: £1,720 with £60 exit fee
- Fix-and-fall estimate at start: £1,760, cap equivalent to £1,900, no exit fee
What could happen: If supplier rates fall after 4 months and your annualised estimate drops by 6%, your fix-and-fall could move from ~£1,760 to ~£1,654 (estimated), potentially beating the fixed—without switching again. If rates don’t fall, you may pay slightly more than the fixed, but you avoid an exit fee and you have a stated cap.
Assumptions: no change in usage; falls are applied to both unit rates; standing charge treatment varies by tariff.
Scenario B: low-use electricity-only flat
- Usage: 1,800 kWh electricity / year
- Tariff 1 (fixed) estimate: £680 (higher standing charge, lower unit rate)
- Tariff 2 (fix-and-fall) estimate: £700 (lower standing charge, slightly higher unit rate), cap equivalent to £760
What could happen: If electricity prices fall modestly, Tariff 2 may reduce and become clearly cheaper. But if the fix-and-fall cap doesn’t cover standing charges and they rise, a low user could still see costs increase. For low usage, standing charges can be the deciding factor—so compare annual totals carefully.
Assumptions: single-rate meter; no additional discounts; prices and standing charges differ by region.
Costs, exclusions and common pitfalls (what to check before you switch)
Fix-and-fall tariffs can be useful—but the detail matters. These are the most common reasons people end up disappointed.
1) “Cap” doesn’t include everything
Some deals cap unit rates but not standing charges—or they cap each separately. Confirm what’s protected for gas and electricity.
2) Exit fees can block you from better deals
If prices fall sharply, a cheaper fixed tariff may appear. Exit fees (sometimes per fuel) can reduce or wipe out any benefit.
3) Meter type limits your options
Prepayment and multi-rate meters (e.g. Economy 7) may have fewer fix-and-fall choices. Always filter comparisons to your meter type.
4) “Falls” may be applied on the supplier’s schedule
Some tariffs adjust periodically rather than instantly. Check how and when reductions are applied (and whether you’re notified).
Direct Debit changes: Your monthly payments can still change if your supplier reviews your account (for example, to manage seasonal usage or balance). That’s separate from the tariff’s unit rates and standing charges.
Fix-and-fall tariffs UK: FAQs
Are fix-and-fall tariffs the same as the Ofgem price cap?
No. The Ofgem price cap limits what suppliers can charge on default tariffs (including many standard variable tariffs), and it varies by region and payment method. A fix-and-fall tariff is a supplier-designed deal with its own cap and rules. Some may be priced with the Ofgem cap in mind, but they are not the same thing.
Can my rates go up on a fix-and-fall tariff?
They typically shouldn’t rise above the stated cap during the term, but you must check the contract terms: what’s capped (unit rate vs standing charge), any circumstances where changes are allowed, and whether the tariff has different caps for gas and electricity.
Do fix-and-fall tariffs have exit fees?
Often, yes—especially if they are sold as a contract with a set term. Exit fees may be listed per fuel (one for electricity and one for gas). Always include exit fees when estimating whether switching later would still be worthwhile.
Will I get the lower rate automatically if prices fall?
That’s the intent, but the mechanics vary. Some suppliers reduce rates at set review points or when they launch cheaper versions of the same tariff. Check how reductions are applied and whether you need to take any action.
Are fix-and-fall tariffs available for prepayment meters?
Sometimes, but availability can be limited compared with monthly Direct Debit. Your options can also depend on whether you have a smart prepayment set-up. Compare using your actual meter type and payment method to avoid misleading estimates.
Does my region matter when comparing tariffs?
Yes. Electricity distribution charges vary by region, which affects unit rates and standing charges. That’s why the same named tariff can show different prices across UK postcodes.
What if I’m renting—can I switch to a fix-and-fall tariff?
If you pay the energy bills and are the account holder, you can usually switch supplier or tariff. If bills are included in rent or you’re not the account holder, you typically can’t. Always check your tenancy terms and speak to your landlord/agent if unsure.
How long does switching take in the UK?
Timelines vary, but many switches complete within a few working days. Your supply won’t be interrupted. If you’re in debt with your current supplier or on certain meter arrangements, the process may be different—your new supplier should explain next steps.
Trust, methodology and sources
Page ownership
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- March 2026
How we assess “fix-and-fall” value
Because “fix-and-fall” is a marketing label rather than a single regulated tariff type, we assess tariffs by comparing what matters to UK households:
- Estimated annual cost using the user’s stated or typical consumption
- Price protection: what’s capped (unit rates/standing charges) and the cap level
- Eligibility: region, meter type, and payment method
- Fees and flexibility: exit fees, contract length, and any review/adjustment rules
- Clarity: whether terms are easy to understand and find in tariff documentation
Limitations: All savings are estimates. We cannot predict future market movements or supplier pricing decisions. Even within the same tariff name, rates can differ by region and payment method. Always validate with the supplier’s tariff information label before switching.
Independent UK sources we reference
- Ofgem (regulator guidance, price cap information, consumer protections)
- Citizens Advice energy advice (switching rights, billing and complaints)
- GOV.UK (official guidance and support schemes where applicable)
Ready to compare fix-and-fall tariffs against the rest of the market?
Get an estimated annual cost for your home and see how fix-and-fall deals stack up against fixed and flexible tariffs in your area.
EnergyPlus comparisons are designed for UK households. Tariff terms and availability change—always confirm key details (cap, standing charge, exit fees) before committing.
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