UK energy · September 2026
Fixed-rate energy tariffs vs the price cap this winter: what changes and what doesn’t
Important: This guide provides general information, not personalised financial advice. Financial products, rates and eligibility rules can change, so check the provider’s current terms before applying. Some links are referral links — we may earn a commission.
Quick answer
Should you fix your energy or stay on the price cap? It depends on the deal.
The Oct–Dec 2026 cap illustration is £1,723 a year for a typical dual-fuel Direct Debit household (+£60 vs Jul–Sep). A fix locks your unit rates for a set term; it can sit above or below that figure.
Compare the fix’s unit rates and standing charges with the current cap, and check the exit fee. This page doesn’t name a supplier.
Want to know whether fixing beats the cap? Compare the two products side by side →
Two products, different rules
Two products, different rules. The October dual-fuel figure is an illustration, not a fixed household bill. Detail: Ofgem energy price cap from 1 October 2026.
| Price-capped SVT / default | Fixed-rate tariff | |
|---|---|---|
| What is set | Maximum unit rates and standing charges (Ofgem), updated every 3 months | Contracted unit rates (and usually standing charges) for a set term (often 12–24 months) |
| Oct–Dec 2026 typical dual-fuel Direct Debit illustration | £1,723 / year (+£60 / 4% vs Jul–Sep £1,663) | Not set by the cap — can sit above or below that illustration |
| Who is affected by the October rise | about 22 million on default tariffs | about 35% / about 11 million already on fixed — Ofgem: not affected by this rise |
| Total bill still moves with usage? | Yes — rates × usage + standing charges | Yes — only the price per unit / per day is locked (read the contract) |
| Leaving early | Usually no exit fee | Exit fee often applies until the final 49 days of the fix |
| When the product ends / changes | Rates can change every quarter with Ofgem’s announcement | At end of fix, usually rolls onto that supplier’s default / SVT (then under the cap) unless you choose another deal |
£1,723 is annualised at medium TDCV (2,500 kWh electricity + 9,500 kWh gas) if Oct–Dec rates ran for a year. Actual cost depends on usage, region, payment method and meter.
Electricity VAT is 0% from 1 October 2026 to 31 March 2027; gas stays at 5%. Ofgem (26 August 2026): you are not affected by changes to the energy price cap if you have changed to a fixed-rate tariff.
The £1,723 figure is an annualised illustration at medium Typical Domestic Consumption Values (2,500 kWh electricity + 9,500 kWh gas) if October–December rates ran for a year. It is not a fixed household bill.
Actual cost = usage × rates + standing charges (region, payment method, meter). Electricity VAT is 0% from 1 October 2026 to 31 March 2027; gas stays at 5%.
Who it’s for — and who should avoid it
Who it’s for
- Households who want predictable unit rates
- People coming off a fix who are now on a default tariff
- Anyone comparing a fixed deal with the price cap
- Households in Great Britain (Ofgem cap)
Who should avoid it
- Anyone who might move home soon and face exit fees
- People who would fix above the cap without checking
- Households in Northern Ireland — the Ofgem cap doesn’t apply
- Anyone expecting a fix to lock their total bill — usage still counts
Full explanation
For how the October figure is built: Ofgem energy price cap from 1 October 2026. Warm Home Discount, ECO4 and local grants sit beside tariff choice, not instead of it: winter heating support.
How a fixed tariff works
On a true fixed deal, the supplier sets the price per unit and usually the daily standing charge for the contract length. Your total bill still moves with usage — only those rates are locked (read the contract).
On a capped SVT, rates can change every quarter with Ofgem’s announcement. You can normally leave anytime without an exit fee.
Ofgem (26 August 2026): you are not affected by changes to the energy price cap if you have changed to a fixed-rate tariff.
When a fix ends, you usually roll onto that supplier’s default / SVT (then under the cap) unless you choose another deal.
Mid-contract rises — or not
A true fixed deal should not raise your contracted unit rates or standing charges mid-term because the price cap moved.
Still read the terms. Trackers, “follows the cap” products and some EV tariffs behave differently — do not treat every non-SVT product as a classic fix.
VAT, tax or government changes can still affect bills even on a fix. Check how your supplier presents rates during the electricity VAT cut (1 October 2026–31 March 2027).
If the cap falls while you are fixed, you keep paying your locked rates unless you leave and pay any exit fee, or wait for the 49-day window.
Exit fees, cooling-off and the 49-day window
- Exit / termination fee: often charged per fuel if you leave a fix early; amount is tariff-specific — check your own contract.
- Final 49 days: switches in the 49-day window before fixed-term expiry should not attract a termination fee (Ofgem / supplier licence practice).
- 14-day cooling-off: after agreeing a new contract, you can usually cancel without an exit fee.
- SVT: typically no exit fee — flexibility vs rate uncertainty.
- Moving home: check whether the fix ends, transfers or triggers fees.
One way to weigh an early exit on paper: compare any expected saving against the remaining exit fee and how many months you would stay. If the fee is larger than the likely saving for that period, waiting for the 49-day window can look better on paper. Personal circumstances vary.
You can compare tariffs using Ofgem and Citizens Advice switching guidance. This page does not link to apply or sign-up pages.
When a fix can sit above or below the cap illustration
Below the £1,723 illustration (possible): Competitive fixed deals are priced from wholesale hedges. As of early September 2026, comparison coverage reported some dual-fuel fixes below the July £1,663 and October £1,723 typical-use illustrations. That is a market snapshot only.
Deals change daily. Regional rates differ. This site names no winners and posts no apply links.
At or above the cap: Many fixes sit at or above capped SVT rates. Certainty then costs a premium versus today’s SVT. Whether that premium is “worth it” depends on how much you value protection against future cap moves — a judgement call, not a yes/no answer from this page.
Standing-charge trap: A quote with a cheap unit rate but a high standing charge can lose for lower users. Compare both elements, and the payment method.
VAT like-for-like: Cap illustrations for October–December embed 0% electricity VAT. Match that presentation on any quote you read.
Winter 2026/27: facts vs forecasts
- Cap 1 Jul–30 Sep 2026 (confirmed): £1,663 typical dual-fuel Direct Debit.
- Cap 1 Oct–31 Dec 2026 (confirmed 26 Aug): £1,723 (+4% / +£60).
- Cap 1 Jan–31 Mar 2027 (not published; due by 25 Nov 2026): analyst forecasts only — for example Cornwall Insight commentary around the October announcement cited about £1,872 on current TDCVs; other aggregates sit in the £1,900s — forecast, can change.
Drivers behind the October rise (Ofgem): wholesale allowance +11%; Middle East / gas markets; gas bills +8% on the October move.
Never treat January 2027 forecasts as Ofgem’s locked figure.
Informational checklist only. These rows do not score tariffs or urge anyone to fix.
| Trap / note | What it means |
|---|---|
| Cap falls later while you are fixed | Locked rates can look expensive versus the new SVT. Leaving early may mean exit fees; waiting for the 49-day window may not. |
| Fix above regional capped rates from day one | Certainty can cost a premium versus today’s SVT. Whether that premium is “worth it” is a judgement call — not a yes from this page. |
| Standing-charge trap | Cheap unit + high standing can lose for low users. Always compare both. |
| Cashback / intro offers | Can distort a headline “% below cap” comparison. Check all-in rates for your usage. |
| Missing the 49-day review | At end of fix you usually roll onto SVT unless you choose another deal. |
| Treating every non-SVT as a classic fix | Trackers and “follows the cap” products are different. Read the terms. |
| January–March 2027 forecasts as fact | Cap for 1 Jan–31 Mar 2027 is not published (due by 25 November 2026). Analyst forecasts only — e.g. Cornwall Insight commentary around the October announcement cited about £1,872 on current TDCVs; other aggregates sit in the £1,900s. Forecast only — can change. Not Ofgem’s confirmed figure. |
| Confirmed vs forecast (winter context) | Confirmed: Jul–Sep 2026 £1,663; Oct–Dec 2026 £1,723 (+4% / +£60). Drivers behind the October rise (Ofgem): wholesale allowance +11%; Middle East / gas markets; gas bills +8% on the October move. |
| Market snapshot, not our ranking | As of early September 2026, comparison coverage reported some dual-fuel fixes below the July/October typical-use illustrations. Market-existence evidence only. Deals change daily. Regional rates differ. This site publishes no tariff table of winners and no apply links. |
Whether a deal suits you depends on your usage, region, current contract, exit fees and how much rate certainty you want. Check Ofgem, your supplier’s terms and a comparison of rates that apply to you. This is general information, not personal advice.
Five checks before you weigh a fix against the cap
| Criterion | What to check | Practical point |
|---|---|---|
| Exit / termination fee | Your own contract — amount is tariff-specific (often per fuel) | Charged if you leave a fix early. There is no single “standard” fee. Compare any expected saving against the remaining fee and how many months you would stay |
| Final 49-day window | Switch timing before fixed-term expiry | Switches in the 49 days before expiry should not attract a termination fee (Ofgem / supplier licence practice) |
| 14-day cooling-off | After agreeing a new contract | Usually cancel without an exit fee (Citizens Advice) |
| Mid-contract rises | Product type and terms | A true fixed deal should not raise contracted unit rates / standing charges mid-term because the price cap moved. Trackers, “follows the cap” products and some EV tariffs behave differently — do not treat every non-SVT as a classic fix. VAT / tax / government changes can still affect bills |
| Standing charge vs unit rate | Both elements on any quote, plus payment method | Standing-charge trap: a cheap unit rate with a high standing charge can lose for lower users. Cap illustrations for Oct–Dec embed 0% electricity VAT — compare like-for-like |
| Already on SVT or already on a fix? | Current tariff type | SVT customers sit under the Oct £1,723 illustration path. Fixed customers are not affected by this quarterly rise |
| Your rates vs Ofgem table | Region + payment method + meter | Compare your unit rates and standing charges to the Ofgem table that applies to you — not only the national dual-fuel illustration |
| Term vs life plans | Contract length vs tenancy / move plans | e.g. a 24-month fix with a 12-month tenancy. Moving home: check whether the fix ends, transfers or triggers fees |
| Certainty vs next-cap uncertainty | How much rate certainty you want for winter | A fix above today’s SVT can still be sensible if you value protection against future rises — or a poor fit if the next cap falls. Forecasts are not confirmed rates |
| Winter support (separate) | WHD / ECO4 / local grants | Eligibility does not depend on whether you fix or stay on the cap — winter heating support |
You can compare tariffs using Ofgem and Citizens Advice switching guidance. This page does not link to apply or sign-up pages and does not rank deals.
- Am I on SVT (under the October cap) or already on a fix?
- What are my unit rates and standing charges versus the Ofgem table for my region and payment method?
- For any quoted fix: unit + standing + term + exit fee + payment method — all-in versus my usage.
- Do I expect to move or need to leave within the term?
- Do I value certainty for winter more than the chance the next cap falls — and am I comparing forecasts honestly against confirmed October rates?
Separately: Warm Home Discount, ECO4 and local grants do not depend on whether you fix or stay on the cap — see winter heating support.
Paying energy bills from a current account: banking. Household budgeting tools: UK budgeting apps.
The catch
A fix locks the price per unit, not your bill. Exit fees often apply until the final 49 days, and at the end of the fix you usually roll onto the supplier’s default tariff. If the cap falls, you could pay more than default customers.
Risks of locking in
- Cap falls later — locked rates look expensive.
- Exit fees if you move, switch or need flexibility.
- Fix priced above your regional capped rates from day one.
- Wrong term length vs tenancy or life plans (for example a 24-month fix with a 12-month tenancy).
- Rolling onto SVT at the end if you miss the 49-day review window.
- Cashback or intro offers that distort a headline “% below cap” comparison.
Fixed-rate energy tariffs: FAQs
What is a fixed-rate energy tariff?
A fixed-rate energy tariff locks unit rates (and usually standing charges) for a set term, often 12–24 months. Your total bill still moves with usage. It is general information on this page — not advice to fix or switch.
How does a fixed tariff differ from the Ofgem price cap?
The Ofgem price cap sets maximum unit rates and standing charges on default and standard variable tariffs and updates them every three months. A fixed deal uses contracted rates for a set term and is not set by the quarterly cap.
Does the October 2026 price cap change my fixed deal?
Ofgem (26 August 2026): you are not affected by changes to the energy price cap if you have changed to a fixed-rate tariff. About 35% of households already on fixed deals are not affected by the October rise.
What is the £1,723 figure on this page?
It is an annualised illustration at medium Typical Domestic Consumption Values if October–December 2026 rates ran for a year. It is not a fixed household bill. Actual cost depends on usage, region, payment method and meter.
What are energy tariff exit fees?
Fixed deals often charge an exit or termination fee per fuel if you leave early. The amount is tariff-specific — check your own contract. Standard variable tariffs typically have no exit fee.
What is the 49-day switching window?
Switches in the 49-day window before fixed-term expiry should not attract a termination fee under Ofgem / supplier licence practice. After agreeing a new contract there is usually a 14-day cooling-off period.
Can a fixed deal sit above or below the cap illustration?
Yes. Some competitive fixes can sit below the £1,723 illustration; many sit at or above capped SVT rates. Deals change daily and regional rates differ. This site names no winners and posts no apply links.
Are January 2027 price-cap forecasts confirmed?
No. The January–March 2027 cap is not published (due by 25 November 2026). Analyst forecasts are predictions and can change. Never treat them as Ofgem’s locked figure.
Do Warm Home Discount or grants depend on fixing?
No. Warm Home Discount, ECO4 and local grants sit beside tariff choice, not instead of it. See winter heating support.
Where are the October 2026 cap numbers explained?
See Ofgem energy price cap from 1 October 2026 for how the £1,723 illustration is built, standing charges, unit rates and payment-method figures.
Get our weekly email
The Friday Finance Lowdown — five minutes of the money stuff worth knowing.
Free to join. See our privacy policy for how we handle your email address.