What is the Energy Price Cap?

The Price Cap applies to 'default' tariffs – ones you don't actively choose to switch to – whether you pay by Direct Debit, cash or cheque, or prepayment. These tariffs are generally known as standard variable tariffs (SVTs), and you'll be on one if any of the below apply.

But right now, due to the recent energy crisis, around 80% of households are on a price-capped. You'll be on a price-capped tariff if:

• You've never switched your energy tariff. You would have always been on your supplier's standard tariff, so you will be protected by the Price Cap.
  
  
• You were on a fixed deal, but haven't chosen to switch again. If you have previously chosen a fixed deal, once the fix period ends you will be automatically rolled on to a price-capped tariff if you do nothing.
  
  
• You were with a supplier that has gone bust. In most cases, if your supplier goes bust, your existing tariff with that supplier will end, Ofgem will pick a new supplier to take over and you'll be moved to that provider's standard tariff, which is protected by the Price Cap.
  
  
• You're moving home. Usually when you move home, your current tariff will end when you let your supplier know you're moving out (a few let you transfer fixed deals, so do check).
  
  You'll then need to contact the existing supplier of the property you're moving into, to let them know when you moved in and to set you up with a new account. From the date you moved in, you'll be placed on a 'default' tariff, which is controlled by the Price Cap.

The Price Cap also doesn't apply to any standard variable tariffs that have an exemption to the Price Cap (this is only for very green deals, and you still have to choose to be on them).

The Price Cap is calculated based on a range of costs energy suppliers face. The largest cost is wholesale energy – what energy suppliers pay for gas and electricity. This accounts for about 43% of a typical bill for a tariff priced at the maximum allowed under the current Price Cap from 1 January to 31 March 2025.

It's also what causes most of the change to the Price Cap every three months, as wholesale prices are constantly fluctuating.

Other elements include things such as the costs of maintaining the pipes and wires that carry gas and electricity, or the operating costs suppliers face for billing customers and providing metering services. See the full list below.

Ofgem can also add on any unexpected costs to the Price Cap

There's also what's known as an 'adjustment allowance', which allows Ofgem to factor any special, unexpected costs into the price – for example, Ofgem has added additional costs for the current high levels of debt in the energy market, as a result of the high cost of energy in recent years.

About £28 of the typical £1,738 a year bill under the current Price Cap is for these debt costs.

Other costs include network, operating and policy costs

Other than wholesale energy costs and the special adjustment allowances, the Price Cap is also made up of the following:

• Network costs. This is the costs suppliers face for building, maintaining and operating the pipes and wires that carry energy to households. It accounts for about 21% of a typical bill under the current Price Cap.
  
  
• Operating costs. This covers the cost of billing and metering services, including the cost of the smart meter rollout. It accounts for about 13% of the current Price Cap on typical use.
  
  
• Policy costs. This is to support Government environmental and social schemes to help households save energy, to reduce emissions and to encourage homes to get solar panels and similar renewable energy tech. It accounts for about 11% of a typical bill under the current Price Cap.
  
  
• VAT. For energy, this is set at 5%, which is added to the price of all tariff rates.
  
  
• Earnings. This is the part of the bill that is profit for a supplier – Ofgem says it allows for a 'fair rate of return' for suppliers. It accounts for around 2% of a typical bill under the Price Cap.
  
  
• Payment method allowance. This is to cover the cost of taking monthly Direct Debits, billing people quarterly by cash, cheque or Direct Debit, or billing by prepayment. How much this is depends on the payment method – for those on the monthly Direct Debit cap, it's under 1%. For those paying by quarterly Direct Debit, cash or cheque, it's a lot more.
  
  
• Other costs. There are a few other small costs Ofgem accounts for, such as what's known as a 'headroom allowance', which is supposed to help with any unexpected costs.