Cheap energy deals UK: should you fix or stay on the price cap?
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Quick answer: Fix for 12 months if a quoted tariff undercuts the Ofgem cap at your actual kWh and you want bill certainty. Stay on a standard variable tariff if fixes sit above the cap or you may move home within a year. From 1 July 2026 the cap rose about 13% for typical dual-fuel direct-debit homes — compare before you assume the default is cheapest.
Energy is the bill most UK households can cut fastest by switching. The price cap is a ceiling on default variable unit rates and standing charges — not a target price and not a cap on your total bill. After the July 2026 reset, staying on a standard variable tariff without comparing is usually the expensive option. This guide is the decision checklist, not a ranked league table of suppliers.
Skip this if: Skip a fix if you are already inside a cheap fixed contract with a high exit fee, if you expect to move before the term ends, or if you cannot pay and need a hardship plan first — switching does not wipe arrears. This page is not a live quote: use an Ofgem-accredited comparison site and our energy tariff comparator with your bill figures.
Should you fix or stay on the price cap?
Fix when the quoted annual cost at your kWh is clearly below what you would pay on the current cap and you value certainty for about a year. Stay variable if every fix you can find is above the cap, if you may move house, or if you want the option to switch again after the next Ofgem reset in October, January or April.
Headline 'typical household' savings are not your savings. Read annual electricity and gas kWh from a recent bill (or estimate in our energy tariff comparator) and compare unit rates plus standing charges. Direct debit, standard credit and prepayment have different cap rates.
We have not modelled your meter. A cheap unit rate with a high standing charge can lose for a low-use flat; the reverse can lose for a large house. If you cannot source today's quotes, do not guess — open an Ofgem Confidence Code comparison and enter real usage.
| If this is you | Usually do this | Skip this if |
|---|---|---|
| On a standard variable tariff after 1 July 2026 | Compare 12-month fixes at your kWh against the cap | You are about to move, or you need a hardship plan first |
| Already on a cheap fix | Wait until the last 49 days unless exit fees are tiny vs saving | A claims firm says you 'must switch today' |
| Prepay or non-direct-debit | Filter comparison results for your payment method | You assume the dual-fuel DD typical bill applies to you |
How do you compare energy deals without getting caught by a cheap headline?
Use an Ofgem Confidence Code comparison site or go direct to suppliers. Enter accurate annual kWh — over-estimating pushes you towards the wrong tariff shape. Check exit fees, the end date, and whether the quote is dual fuel or electricity-only.
Read Ofgem's supplier performance and complaints data before you pick the cheapest name. A tariff that is £40 a year cheaper is not a win if billing errors take months to unwind. The cheapest deal is a claim to verify, not a bargain to grab.
Smart meters usually stay in place; the new supplier takes over the configuration. Prepayment switches are allowed but fewer tariffs appear — compare specifically for prepay rather than using a direct-debit quote.
What if you are already in a fixed deal?
Leaving early usually means an exit fee. Add that fee to the remaining months on your current unit rates and compare with the new quote. If the saving does not cover the fee with a clear margin, stay put until the 49-day window.
Cooling-off is 14 days after you sign the new contract — not a reason to switch twice in a week. If a switch is in flight, wait for it to complete before starting another.
What should you do if you cannot pay the bill?
Contact your supplier before you fall behind — they must offer affordable payment plans. Ask about the Priority Services Register and Warm Home Discount eligibility, and whether a broadband or mobile social tariff would free budget for energy. Switching does not write off arrears; the debt usually follows you.
Free debt help is from StepChange, National Debtline or Citizens Advice — not from a paid claims firm. See our energy price cap and Warm Home Discount guide for the rebate rules, and the energy switching how-to for the mechanics.
Common questions
Should I have fixed before the July 2026 cap rise?
If you were on a standard variable tariff, comparing fixes before 1 July 2026 usually made sense when a fix undercut the new cap. That window has closed for that reset — compare against the live Jul–Sep cap now, and again before the October review. If you are already on a cheap fix, check exit fees before moving.
Can I switch with a smart meter or prepayment meter?
Yes. Smart meters usually stay; the new supplier may need to take over the meter configuration. Prepayment switches are possible but the panel of tariffs is thinner — compare for prepay, not using a direct-debit typical-bill figure.
Is the Ofgem price cap the cheapest tariff?
No. It is a ceiling on default variable rates. Fixed deals can sit below or above it. Your bill still depends on kWh, region and payment method.
Does Money Guide earn commission if I switch?
Only if you follow a link marked * or labelled Ad. This guide is information. Use an Ofgem-accredited comparison site or go direct; we are not a supplier and we do not arrange the switch.