The energy price cap is one of the most frequently discussed but least understood aspects of UK household finances. Understanding how it works helps you interpret energy news accurately and make better decisions about your tariff.
- What the price cap actually is
- How it is set
- Fixed versus variable tariffs
What the price cap actually is
The Ofgem price cap does not limit the total amount you pay for energy. It limits the unit rate and standing charge that suppliers can charge customers on default tariffs — the tariffs that people are automatically placed on if they do not actively choose a fixed deal.
The cap is expressed as an annual figure for a typical household — currently around £1,568 per year for the average home using 11,500 kWh of gas and 2,700 kWh of electricity. If you use more energy than this typical amount, you will pay more. If you use less, you will pay less.
How it is set
Ofgem reviews the price cap every three months — in January, April, July, and October. Each review reflects changes in wholesale energy costs, which fluctuate with global gas prices, geopolitical events, and seasonal demand. The cap can go up or down with each review.
Fixed versus variable tariffs
On a standard variable tariff, your unit rate moves with the price cap. You benefit when the cap falls but pay more when it rises. A fixed-rate energy tariff locks your unit rate for a set period — typically 12 to 24 months — regardless of what happens to the cap.
Fixed rates often carry a premium over the current cap when wholesale prices are rising, but provide certainty and protection against further increases. When wholesale prices are falling, the cap typically beats fixed deals.
Prepayment meters
Prepayment meter customers have historically paid more than direct debit customers. Ofgem has required suppliers to charge prepayment customers the same rates as direct debit customers, but the practical experience still varies. If you are on a prepayment meter, check whether switching to a smart prepayment meter or a credit meter would benefit you.
Bottom line
The energy price cap protects you from the worst extremes of wholesale price rises, but it is not a ceiling on your bill — usage matters enormously. Reducing consumption, ensuring your home is well insulated, and comparing tariffs when fixed deals are available can all reduce what you pay.