What Is The Energy Price Cap?

A Complete Guide for UK Households and Small Businesses (2026)

The Energy Price Cap is one of the most widely discussed parts of the UK energy market, but is sometimes misunderstood. Many people believe it limits the total amount they can pay for gas and electricity. Others assume every supplier must charge exactly the same prices. Neither is correct.

The Energy Price Cap sets a maximum amount that suppliers can charge for each unit of electricity and gas, together with limits on standing charges, for households on certain types of energy tariff. It does not cap your total bill. If you use more energy, you will still pay more.

Understanding how the Energy Price Cap works can help you make better decisions about your energy tariff, compare fixed deals with variable tariffs, and understand why your bills change even when your energy use stays the same.

In this guide you’ll learn:

• What the Energy Price Cap is
• Why it was introduced
• Who sets it
• How it is calculated
• Which tariffs it affects
• Why prices differ across the UK
• How often it changes
• How it affects your energy bills
• Common myths and misunderstandings

What Is the Energy Price Cap?

The Energy Price Cap is a limit on the maximum rates that energy suppliers can charge households on standard variable tariffs (SVTs) and default tariffs.

Rather than limiting your overall bill, the cap limits:

• the maximum unit rate for electricity (measured in pence per kilowatt-hour or kWh)
• the maximum unit rate for gas (pence per kWh)
• the maximum standing charge that suppliers can apply each day.

Your final bill depends on how much energy you use. Someone living in a large detached home with electric heating will normally pay much more than someone living in a small flat, even though both are protected by exactly the same Energy Price Cap.

Why Was the Energy Price Cap Introduced?

Before the cap was introduced, millions of households remained on expensive default tariffs for years without realising they could switch supplier or tariff. Customers who actively switched often benefited from much lower prices, while loyal customers frequently paid significantly more.

The UK Government introduced legislation in 2019 allowing Ofgem to protect consumers from excessive pricing while still allowing suppliers to compete.

The objectives of the Energy Price Cap include:

• protecting customers who do not regularly switch supplier
• preventing suppliers from charging unreasonable prices
• ensuring suppliers can recover efficient operating costs
• maintaining competition in the retail energy market
• encouraging suppliers to improve customer service rather than relying on customer inertia.

The Energy Price Cap is designed to ensure customers pay a fair price that reflects the actual cost of supplying energy under current market conditions.

Who Sets the Energy Price Cap?

The Energy Price Cap is set by Ofgem, the independent energy regulator for Great Britain.

Ofgem regulates electricity and gas markets across England, Scotland and Wales. Its responsibilities include protecting consumers, promoting competition, licensing energy suppliers and ensuring companies meet their legal obligations.

When setting the Energy Price Cap, Ofgem does not simply choose a number. Instead, it carries out detailed calculations based on the expected costs that an efficient supplier is likely to face over the coming price cap period.

These calculations are published in full, together with supporting data, allowing suppliers, consumer groups and industry experts to examine how each Energy Price Cap has been determined.

Who Does the Energy Price Cap Apply To?

The Energy Price Cap applies to households that are on:

• standard variable tariffs (SVTs)
• default tariffs
• deemed contracts following a move into a property
• many prepayment meter tariffs (which are covered by equivalent regulated protections).

If you have never actively chosen a tariff, or if your fixed tariff has ended and you have not selected a new one, you will usually move onto your supplier’s default tariff, which is protected by the Energy Price Cap.

Who Is Not Covered by the Energy Price Cap?

The cap does not apply to every energy contract.

For example, it generally does not apply to:

• fixed-price tariffs during the agreed contract period
• most business energy contracts
• commercial electricity agreements
• large industrial energy contracts.

Small businesses are usually offered fixed commercial contracts where prices are agreed directly between the supplier and the customer. These contracts are influenced by wholesale energy markets but are not subject to the domestic Energy Price Cap.

Does the Energy Price Cap Mean Every Supplier Charges the Same?

No.

The Energy Price Cap sets a maximum level that suppliers can charge for default tariffs. Suppliers remain free to charge lower prices if they wish.

Competition still exists. Suppliers compete by offering:

• lower fixed tariffs
• better customer service
• renewable energy options
• smart home services
• reward schemes
• digital account management.

This means it is still worth comparing tariffs regularly, even when the Energy Price Cap is in place.

What Does the ‘Typical Household’ Figure Mean?

Whenever a new Energy Price Cap is announced, newspapers often report a figure such as “the Energy Price Cap is £1,800 per year”. This can easily be misunderstood.

That figure is not a maximum bill.

Instead, it represents what Ofgem estimates a typical household would pay over a year if it used a representative amount of gas and electricity while paying the capped unit rates and standing charges.

Because every home uses different amounts of energy, your annual bill could be considerably lower, or considerably higher, than the published “typical” figure.

Your actual costs depend on factors including:

• how well your property is insulated
• its size
• the number of people living there
• whether you use gas, electricity or alternative heating fuels
• your heating habits
• how efficiently your appliances use energy.

Why Your Energy Bill Can Still Be Higher Than the Energy Price Cap

If you double your energy consumption, your bill will approximately double as well because you are paying for more units of electricity and gas.

Imagine two households on exactly the same tariff.

• Household A uses relatively little energy because they live in a small, well-insulated flat.
• Household B lives in an older detached property with higher heating demand.

Although both households pay the same unit prices, Household B will receive a much larger bill simply because it uses more energy.

This is why reducing energy consumption through insulation, efficient heating systems and better energy management can have just as much impact as choosing the right tariff.

How Is the Energy Price Cap Calculated?

One of the most common misconceptions is that Ofgem simply decides how much energy suppliers are allowed to charge. In reality, the Energy Price Cap is calculated using a detailed methodology that estimates the costs an efficient supplier is expected to incur when supplying gas and electricity to domestic customers.

Ofgem reviews a wide range of market data and industry costs before setting each Energy Price Cap. The methodology is published openly, allowing suppliers, consumer groups and independent experts to scrutinise how the cap has been calculated.

Rather than reflecting the costs of any individual supplier, the Energy Price Cap is based on the estimated costs of a reasonably efficient supplier operating in today’s energy market.

Broadly speaking, the Energy Price Cap is made up of several cost components:

• Wholesale energy costs
• Network costs
• Government policy costs
• Operating costs
• Smart meter costs
• Supplier profit allowance
• VAT
• Adjustments for forecasting differences and exceptional events

Each of these elements can rise or fall independently, which is why the Energy Price Cap changes over time.

1. Wholesale Energy Costs

Wholesale energy is the electricity and natural gas that suppliers buy before selling it to households.

Energy suppliers purchase electricity and gas months or even years in advance through wholesale markets. Prices in these markets are influenced by global supply and demand, weather conditions, storage levels, international events, exchange rates and fuel availability.

Wholesale costs typically make up the largest component of the Energy Price Cap. When wholesale prices rise significantly, suppliers pay more for the energy they purchase. Unless these increases are temporary, they are reflected in future Energy Price Cap calculations.

For example, wholesale prices increased sharply during the global energy crisis of 2021–2022 due to reduced gas supplies, increased international demand and geopolitical instability. This was the main reason the Energy Price Cap increased substantially during that period.

Conversely, when wholesale prices fall over a sustained period, future Energy Price Caps generally reduce as suppliers are able to buy energy at lower prices.

2. Network Costs

Once electricity and gas have been generated or imported, they still need to reach homes across Great Britain.

Network costs cover the operation, maintenance and improvement of the country’s energy infrastructure, including:

• Electricity transmission networks
• Electricity distribution networks
• Gas transmission pipelines
• Local gas distribution networks

These charges help pay for maintaining thousands of miles of cables, substations, transformers and pipelines that safely deliver energy to homes and businesses.

Network operators are also regulated by Ofgem, and their allowable charges are reviewed periodically.

3. Government Policy Costs

Some of your energy bill helps fund government programmes designed to improve the UK’s energy system and support vulnerable households.

These policy costs include funding for initiatives such as:

• support for renewable electricity generation
• energy efficiency programmes
• assistance for vulnerable consumers
• decarbonisation policies
• environmental obligations placed on suppliers.

Although these costs form only one part of the overall Energy Price Cap, changes in government policy can affect future calculations.

4. Operating Costs

Energy suppliers incur many day-to-day costs that are not directly related to buying energy.

These include:

• customer service
• billing systems
• IT infrastructure
• meter reading
• debt management
• staff salaries
• regulatory compliance
• call centres
• fraud prevention

Ofgem estimates what an efficient supplier should reasonably spend on these activities. Suppliers with unusually high operating costs are not automatically allowed to recover those additional costs through the Energy Price Cap.

5. Smart Meter Costs

The ongoing rollout of smart meters across Great Britain also forms part of suppliers’ costs.

Installing, maintaining and supporting smart metering infrastructure involves significant investment. These costs are included within the overall Energy Price Cap calculation rather than being charged separately to customers.

6. Supplier Profit Allowance

Contrary to some media reports, the Energy Price Cap does not require suppliers to sell energy without making a profit.

Instead, Ofgem includes a modest profit allowance within the calculation. This is intended to allow efficient suppliers to remain financially viable while protecting customers from excessive pricing.

A healthy energy market requires suppliers to be financially sustainable. If suppliers consistently operated at a loss, competition would reduce and customers could ultimately face fewer choices.

7. VAT

Domestic gas and electricity are currently subject to a reduced rate of VAT. This VAT is included within the Energy Price Cap calculations so that published figures represent the total price consumers pay.

8. Forecasting Adjustments

No forecasting model is perfect. Ofgem therefore makes periodic adjustments to account for differences between expected costs and the actual costs experienced by suppliers.

These adjustments help ensure the methodology remains fair over time without causing sudden instability in the market.

Why Does the Energy Price Cap Differ Across Great Britain?

Many people are surprised to learn that there is no single nationwide unit rate or standing charge.

Instead, the maximum rates vary depending on where you live.

This is because network costs differ between regions. Some areas are more expensive to serve than others due to factors such as geography, infrastructure and the local electricity and gas distribution networks.

As a result, households with similar energy usage may pay slightly different unit rates depending on their location.

Why Are Standing Charges Included?

Your energy bill is usually made up of two separate charges:

• Unit rates – the amount you pay for each kilowatt-hour (kWh) of energy you use.
• Standing charges – a fixed daily amount that helps cover the cost of maintaining your connection to the energy network and providing your account.

You pay the standing charge whether you use a large amount of energy, a small amount, or none at all.

The standing charge contributes towards the costs of maintaining local energy infrastructure, metering, billing systems and other fixed costs that exist regardless of consumption.

Because standing charges are also regulated under the Energy Price Cap, suppliers cannot charge more than the regional maximum for customers on capped tariffs.

Why Doesn’t Everyone Pay Exactly the Same?

Even if two households are protected by the same Energy Price Cap, their bills are unlikely to be identical.

Differences can arise because of:

• regional network charges
• different electricity distribution areas
• gas availability
• the type of meter installed
• annual energy consumption
• payment method
• whether the property has gas central heating or relies on electricity.

How Often Does the Energy Price Cap Change?

The Energy Price Cap is reviewed and updated by Ofgem every three months. This means the maximum unit rates and standing charges for customers on default tariffs can increase, decrease or remain broadly unchanged four times each year.

The current review cycle is designed to allow the cap to reflect changes in wholesale energy markets more quickly than was previously possible. Before October 2022, the Energy Price Cap was updated every six months. Following unprecedented volatility in global energy markets, Ofgem moved to quarterly updates to ensure prices more accurately reflected suppliers’ underlying costs.

The quarterly review periods begin on:

• 1 January
• 1 April
• 1 July
• 1 October

Each new Energy Price Cap remains in effect until the next scheduled review, unless there are changes to the regulatory framework introduced by legislation.

When Does Ofgem Announce a New Energy Price Cap?

Ofgem usually announces the next Energy Price Cap around six to eight weeks before it comes into effect. This gives energy suppliers time to update their tariffs and allows households to consider whether a fixed tariff may be suitable before the new rates apply.

Because wholesale markets continue to move between announcements, analysts often publish forecasts of future Energy Price Caps. These forecasts can be useful for understanding market trends but should not be treated as guaranteed outcomes. Only Ofgem’s published figures determine the actual Energy Price Cap.

Why Does the Energy Price Cap Rise and Fall?

The Energy Price Cap changes because the costs of supplying energy are constantly changing. Ofgem’s role is not to hold prices at a fixed level, but to ensure that customers on default tariffs pay a price that broadly reflects the costs of supplying energy while protecting them from excessive charges.

Several factors can influence whether the Energy Price Cap increases or decreases, including:

• changes in wholesale gas and electricity prices
• weather conditions affecting energy demand
• international energy supply and demand
• network investment costs
• changes to government energy and environmental policies
• supplier operating costs
• updates to forecasting assumptions.

In practice, wholesale energy costs are usually the single biggest driver of changes to the Energy Price Cap. However, no single factor determines the final figure.

The Relationship Between Wholesale Prices and Your Energy Bill

Many people expect their energy bills to fall immediately when wholesale gas prices drop. However, there is often a delay between movements in wholesale markets and changes to domestic tariffs.

This is because suppliers purchase much of their energy in advance to reduce the risk of sudden price fluctuations. As a result, today’s wholesale prices do not immediately translate into today’s household bills.

Similarly, if wholesale prices increase rapidly, suppliers may already have secured a proportion of their energy at lower prices, helping to reduce the immediate impact on consumers.

The quarterly Energy Price Cap review helps smooth these changes over time rather than allowing prices to fluctuate every day.

Fixed Tariffs and the Energy Price Cap

The Energy Price Cap applies only to standard variable and default tariffs. If you choose a fixed tariff, the unit rates and standing charges are agreed for the length of your contract and are not affected by subsequent Energy Price Cap changes.

This means:

• if the Energy Price Cap rises during your fixed contract, your agreed prices remain the same until the contract ends
• if the Energy Price Cap falls below your fixed rates, you may end up paying more than customers on variable tariffs.

Some fixed tariffs also include exit fees if you leave before the end of the contract, so it is important to read the terms and conditions before switching.

Common Myths About the Energy Price Cap

“The Energy Price Cap is the most I can pay each year.”

False. The Energy Price Cap limits unit rates and standing charges, not your total annual bill.

“Every supplier charges exactly the same.”

False. Suppliers cannot charge more than the cap for default tariffs, but they are free to offer lower prices or fixed tariffs with different rates.

“If the Energy Price Cap falls, my bill will definitely fall.”

Not necessarily. If your energy use increases, your overall bill may still rise despite lower unit rates.

“The Energy Price Cap applies to businesses.”

Generally, no. Most business energy contracts are negotiated separately and are not covered by the domestic Energy Price Cap.

Frequently Asked Questions

Does everyone receive the same Energy Price Cap?

No. The maximum unit rates and standing charges vary by region, payment method and fuel type because network costs differ across Great Britain.

Can my supplier charge less than the Energy Price Cap?

Yes. The cap sets maximum prices for eligible tariffs. Suppliers remain free to offer cheaper tariffs if they choose.

Does the Energy Price Cap apply if I have a smart meter?

Having a smart meter does not determine whether the cap applies. What matters is the type of tariff you are on. If you are on a standard variable or default tariff, you are generally protected by the cap regardless of the type of meter installed.

Does the Energy Price Cap guarantee the cheapest tariff?

No. It is a consumer protection measure, not a guarantee of the lowest available price. Depending on market conditions, a fixed tariff may sometimes be cheaper.

Key Takeaways

• The Energy Price Cap is set by Ofgem.
• It limits unit rates and standing charges for eligible domestic tariffs, not your total bill.
• Your actual energy costs depend on how much energy you use.
• The cap is reviewed every three months.
• Wholesale energy costs are the largest factor influencing changes to the cap.
• Most business energy contracts are not covered by the domestic Energy Price Cap.
• Comparing tariffs regularly can still help you reduce your energy costs.

Need Help Understanding Your Energy Bills?

At The Centre For Energy Literacy, our aim is to help households and small businesses make informed decisions based on clear, impartial information. Explore our guides to build your understanding of the UK energy market and discover practical ways to improve energy efficiency, reduce costs and navigate the transition to a lower-carbon future.