The energy price cap will rise by £63 in October, the third increase this year. Ofgem confirmed the figure on 23 August, pushing the typical dual-fuel bill to £1,717 a year. For a 3-bed semi using 12,000 kWh of gas and 2,700 kWh of electricity, that is roughly £143 a month. The cap is a ceiling, not a target: suppliers can still undercut it.
As reported by Uswitch, the question every household faces is whether to lock in a fixed deal or ride the variable cap. The answer depends on your home’s energy efficiency, your current tariff, and your appetite for risk.
Who qualifies, and who doesn’t
Every household on a standard variable tariff (SVT) is protected by the cap. But the cap does not cap your total bill, it caps the unit price and standing charge. Use more energy, pay more. The October rise adds about 6% to the unit rate for electricity and 4% for gas, depending on region. Those on pre-payment meters pay slightly less, but the gap is narrowing: from October, the prepayment cap will be within £20 of the direct debit cap.
Fixed deals, meanwhile, are available to any creditworthy household. Suppliers are offering 12-month fixes at rates 5-10% below the October cap, around £1,550 to £1,630 a year for typical use. But these deals come with exit fees of £50-£75 per fuel. If the cap falls again in January (analysts at Cornwall Insight forecast a drop of £70-£90), you could be stuck paying more than the variable rate.
What it costs a typical 3-bed semi
Take a semi-detached home in Manchester with cavity-wall insulation and an A-rated gas boiler. Annual usage: 11,500 kWh gas, 2,800 kWh electricity. On the October cap, that household pays about £1,700 a year. A fixed deal at 8% below the cap would cost £1,564, a saving of £136. But if the January cap falls 6% below October levels, the variable rate drops to £1,598, wiping out half the saving. And if the household has solar panels exporting to the grid, the calculation changes again: the fixed deal’s export rate (typically 15p/kWh) may be lower than the cap-linked Smart Export Guarantee (currently 16.5p/kWh for most suppliers).
The catch is that fixed deals are not all equal. Some have high standing charges, up to 60p a day for electricity, which hit low-users hardest. A single-person flat using 1,800 kWh a year might find the standing charge eats up 40% of the bill. For those households, the variable cap may still be cheaper despite the October rise.
What this misses, solar, heat pumps and EPC impact
The cap is built on a ‘typical’ home, one without solar, a heat pump, or battery storage. If you have any of these, the cap’s unit rates matter less than the structure of your tariff. Heat pump users, who typically use 4,000-6,000 kWh of electricity a year for heating, need a tariff with a low unit rate and no time-of-use penalties. Some fixed deals offer a heat pump-specific tariff (e.g., Octopus Cosy or EDF’s Heat Pump Tracker), which can be 20% cheaper than the cap. But these often require a smart meter and a minimum 12-month commitment.
For homeowners planning upgrades, the decision to fix should match your retrofit timeline. If you are installing solar in November, a 12-month fix gives price certainty while you wait for the panels to generate. If you are replacing a gas boiler with a heat pump in spring 2025, a variable tariff might be better, you can switch to a heat pump-specific deal once the installation is complete.
Energy Saving Trust data shows that homes with an EPC of C or above use 25% less gas than the ‘typical’ home. Those households should model their own usage, not rely on the cap’s headline figure. A home with solar, battery storage and a heat pump could cut annual electricity costs to £400-£600, making the October cap rise almost irrelevant. But for the 60% of UK homes still on an EPC D or below, every £63 matters.
Ofgem’s next cap announcement is due in late November for the January-March period. If you are considering a fixed deal, compare offers from at least three suppliers and check the exit fee. The best fix today may look expensive in February. The worst variable rate may still be cheaper than a bad fix.
Households on standard variable tariffs can switch to a fixed deal through their supplier’s website or a comparison site anytime. The October cap takes effect on 1 October. If you want to lock in a rate below £1,700, act before then.
Frequently Asked Questions
The typical dual-fuel bill rises by £63 to £1,717 a year. This is based on 12,000 kWh of gas and 2,700 kWh of electricity. Your actual bill depends on your usage and payment method.
If you find a fixed deal 5-10% below the October cap and are confident your usage won't drop sharply, it may save £100-£150 a year. But check exit fees, if the cap falls in January, you could lose those savings.
