The energy price cap confuses almost everyone. People hear "cap" and assume there's a limit on how much they'll pay. There isn't. The cap controls the maximum unit rate your supplier can charge, not your total bill. If you use more energy, you pay more. Simple as that. But understanding how the cap works helps you predict what your bills will do next quarter, and that's genuinely useful.

What the price cap actually caps

Ofgem (the Office of Gas and Electricity Markets) sets the maximum amount suppliers can charge per unit of electricity and gas on standard variable tariffs. From 1 October 2026, those rates are:

One thing changed this quarter that's worth flagging. The government has removed VAT from all domestic electricity between 1 October 2026 and 31 March 2027, so you pay no VAT on electricity at all. Gas keeps its 5%. That held electricity roughly flat while gas rose about 8%.

Standing charges are what you pay just for being connected to the grid. You pay them even if you use zero energy. At these rates, your standing charges alone cost about £308 per year before you've boiled a single kettle. That catches a lot of people off guard, especially those with low usage who expected a small bill.

How often does it change?

Ofgem updates the cap quarterly: January, April, July, and October. They announce the new rate roughly 2 months before it takes effect, so you get some warning. The calculation considers wholesale energy costs (what suppliers pay on global markets), network costs (maintaining pipes and cables), policy costs (environmental levies), and a supplier profit margin of 2.4%.

Wholesale costs make up about 40% of the total, which is why the cap shot up in late 2022 when gas prices spiked after Russia's invasion of Ukraine. At the peak in January 2023, electricity hit 33.2p/kWh and gas reached 10.3p/kWh. The annual bill for a medium user topped £2,500. Today's rates are considerably lower, but still about 60% higher than pre-2021 levels when electricity was around 17p/kWh.

Why your bill isn't "capped" at £1,723

You'll see headlines saying the price cap is £1,723. That's the estimated annual bill for Ofgem's "medium user," defined as a household consuming 2,500 kWh of electricity and 9,500 kWh of gas per year. These are the Typical Domestic Consumption Values (TDCVs), which Ofgem lowered in July 2026 to reflect households using less energy.

But those are averages. A 4-bed detached house with poor insulation might use 4,000 kWh of electricity and 18,000 kWh of gas. Their annual bill at the same unit rates would be roughly £2,800. A one-bed flat with good insulation might use 1,500 kWh electricity and 5,000 kWh gas, paying about £1,100. The cap doesn't protect you from high usage; it protects you from being overcharged per unit.

Low, medium, and high usage households

Using the October 2026 rates, here's what different consumption levels translate to:

These figures include standing charges. If you're not sure where you fall, check your annual consumption on your last bill or log into your supplier's app. Your smart meter IHD also shows cumulative usage for the month.

Recent price cap history

The cap has moved dramatically over the past 4 years. Here's the unit rate for electricity at each quarterly change:

The trend is relatively stable now. Analysts at Cornwall Insight and other energy consultancies forecast the cap staying in the mid-20s per kWh through 2027, barring another geopolitical shock or harsh winter that spikes gas demand.

Fixed tariffs vs the price cap

If you're on a fixed tariff, the cap doesn't directly affect you. Your rate stays locked until the contract ends (typically 12 or 24 months). But fixed deals are priced relative to the cap. When suppliers expect the cap to rise, fixes are priced higher. When they expect it to fall, you can sometimes find fixes below the current cap rate.

Right now, the cheapest 12-month fixed deals sit a little below the 26.32p cap for electricity, which suggests the market thinks prices will stay flat or drop slightly. Locking in could save you a few pence per kWh if the cap holds or rises. But if the cap falls next quarter, you'd have been better off staying on the variable tariff.

Prepayment meters

Since July 2024, the cap rates for prepayment meters are the same as credit meters. Before that, prepayment customers paid a premium of up to 2p/kWh. Ofgem equalised the rates after public pressure and an investigation into the forced installation of prepayment meters by suppliers. If you're on prepayment, you now pay the same 26.32p/kWh as everyone else on a standard tariff.

What you can actually do about it

You can't change the unit rate (unless you switch to a fixed deal or off-peak tariff). But you can control how much energy you use. Every kWh you don't use saves you 26.32p on electricity or 7.97p on gas. Turning your thermostat down by 1°C typically saves 8-10% on gas bills, which for a medium user is about £68-76 per year. Using a microwave instead of an oven saves roughly 60% of the electricity for small meals. And running your washing machine at 30°C instead of 40°C cuts its energy use by about 40% per cycle.

Our appliance running cost calculator helps you identify which devices are costing you the most. And if you're thinking about solar panels to reduce your reliance on grid electricity, our solar savings calculator shows how quickly the investment pays for itself at current rates.