What Is the Energy Price Cap?

The energy price cap is a limit set by Ofgem on how much energy suppliers can charge per unit of gas and electricity, as well as on daily standing charges.

It is designed to protect households, especially those on standard variable tariffs, from being overcharged. However, the price cap does not cap your total bill, which still depends on how much energy you use. This is why many households still wonder why their energy bill is so high, even under the price cap.

How Does the Energy Price Cap Work?

The price cap sets:

• a maximum price per kilowatt-hour (kWh) for gas and electricity
• a limit on standing charges (the daily cost of being connected)

It applies to customers on default or standard variable tariffs, which are often the tariffs people move onto when a fixed deal ends.

Your total bill can still go up or down depending on:

• Households on standard variable tariffs
• Customers using prepayment meters

If you’re on a fixed-rate tariff, the price cap does not apply directly because your prices are already agreed for a set period.

Why Was the Energy Price Cap Introduced?

The cap was introduced in 2019 after concerns that some households, particularly those who hadn’t switched suppliers, were paying significantly more than necessary.

Its goals are to:

• prevent unfair pricing
• protect vulnerable customers
• encourage competition in the energy market

How Is the Price Cap Set?

Ofgem reviews the energy price cap every three months.

The level is based on:

• wholesale gas and electricity prices
• network and infrastructure costs
• operating costs for suppliers
• government energy and environmental policies

When these costs rise, the cap increases. When they fall, the cap should come down. Price cap changes are one reason energy bills can rise without warning.

Why Does the Price Cap Keep Changing?

Energy prices are affected by global and domestic factors, including:

• changes in wholesale energy markets
• supply and demand
• geopolitical events
• long-term investment in energy infrastructure

This volatility means the price cap can move up or down several times a year.

Does the Price Cap Mean You’re on the Cheapest Deal?

No.

The price cap limits how expensive default tariffs can be, it does not guarantee the cheapest energy prices. This often affects households when a fixed tariff ends and they move onto a variable deal.

Many households can still find better value on fixed-rate tariffs, especially when market conditions improve.

What Can You Do to Lower Your Energy Bills?

Even with the price cap in place, you can still take action:

• Compare tariffs regularly to avoid overpaying
• Consider fixed-rate deals for price certainty
• Reduce energy usage through efficiency improvements
• Review your bills to check you’re not paying more than similar households

Is Your Energy Bill Fair?

Being protected by the price cap doesn’t automatically mean your bill is fair.

At ismybillfair, we help you compare what you’re paying against similar households, so you can see whether your energy costs reflect real usage, or whether you’re overpaying.

Final Thoughts

The energy price cap plays an important role in protecting consumers, but it’s only a safety net, not a guarantee of the best deal.

To make sure you’re paying a fair price, it’s worth staying informed, reviewing your tariff regularly, and checking whether better options are available.