Why is business energy so expensive?

If your energy bill has jumped recently, you're not alone. Energy costs have risen sharply during 2026, and many UK firms are paying far more than they expected.

The reasons are not always obvious. Some are structural and built into how the market works. Others are contract-related or influenced by how and when your business uses energy. And then there are those tied to geopolitical events.

Understanding the cause of high energy prices is the first step to doing something about it. Let's take a closer look at why business energy can be so expensive.

In this guide to why business energy is so expensive…

• We explain why businesses can pay more than households, including VAT and the Climate Change Levy.
• We look at the market factors pushing up costs in 2026, including wholesale prices and network charges.
• We cover how your contract type can increase what you pay by between 30% and 70% compared with a competitor.
• We identify common usage inefficiencies that quietly inflate your bills without obvious cause.
• We show you how to find the root cause of your high costs and what to do next.

Why do businesses pay more than households?

Arguably, the single biggest structural reason is tax. 

Households pay 5% VAT on energy. Although there are some circumstances where a business can pay a reduced rate of 5% VAT, most businesses pay 20% VAT on energy. That alone adds a significant amount to every bill.

If your business is VAT registered, you can reclaim VAT on energy like any other business expense. Read our guide to VAT and business energy to find out more.

On top of that, your businesses may also pay the Climate Change Levy (CCL). This is a government tax on the energy businesses use. It is charged per unit of electricity and gas and appears as a line item on business energy bills. Some businesses in energy-intensive industries may be exempt or eligible for a reduced rate.

The 2026/27 CCL rates are as follows:

Taxable Commodity	Rate (2026/27)
Electricity	£0.00801 per kWh (0.801p)
Natural Gas	£0.00801 per kWh (0.801p)
LPG	£0.02175 per kg (frozen)
Other Taxable Commodities (Solid Fuels)	£0.06264 per kg

Small businesses using 10,000 kWh of electricity per year pay roughly £80 in CCL charges alone. Medium-sized firms using 50,000 kWh pay around £400.

Domestic customers are protected by the energy price cap. Business customers are not. There is no equivalent cap for commercial energy. This means business prices move more freely with the market, so it's important to fix your rates and not roll onto variable out-of-contract rates.

Market factors driving high business energy costs

There are several market factors that contribute to the price you pay for energy. Here are some of the main drivers behind the size of your business energy bills.

Wholesale energy prices

Wholesale prices, the cost of buying energy before it reaches your premises, have been volatile since 2021.

The 2022 energy crisis pushed prices to record highs. Prices fell back in 2023 and 2024, but they have not returned to pre-2021 levels. Geopolitical instability and tight global supply continue to keep them above historical averages.

When wholesale costs are high, suppliers pass these on to business customers. Fixed-rate contracts lock in a price at a point in time. Variable or flexible contracts move with the market, which means your bill can change month to month.

Network charges - why TNUoS matters in 2026

A portion of every business energy bill covers the cost of maintaining the national grid and local distribution networks. These are called network charges.

The biggest of these is the Transmission Network Use of System (TNUoS) charge. From April 2026, TNUoS charges rose by more than 60% year-on-year, according to data from the National Energy System Operator (NESO).

This increase affects all businesses connected to the grid. It appears as part of your standing charge or unit rate and is outside your supplier's control.

If your bill has increased since April 2026, rising network charges are likely a contributing factor.

TNUoS charges are set by the National Energy System Operator (NESO) and reviewed annually. They reflect the cost of running the high-voltage transmission network across Great Britain. All electricity consumers contribute, though the share varies by connection type and consumption level.

Find out more in our guide to non-commodity Costs & TNUoS/DUoS charges.

The new RAB nuclear levy

Since 2025/26, a new Regulated Asset Base (RAB) charge of 0.346p per kWh has been added to electricity bills for most businesses.

This charge helps fund the construction of new nuclear power stations in the UK. It's applied to almost all electricity consumers, except those in energy-intensive industries who may be exempt.

It is a small but real addition to every unit of electricity your business uses, and it adds up over time.

Contract-related reasons for high energy bills

Market factors affect everyone. But your contract can make a significant difference to what you actually pay.

Out-of-contract or deemed rates

If your contract has expired and you have not renewed, you may have rolled onto out-of-contract rates. These are set by your supplier and are often much higher than agreed rates.

Some businesses stay on these rates for months without realising it. If you are unsure when your contract ends, check your bill or contact your supplier now.

Fixed versus variable tariffs

A fixed-rate contract locks your unit rate for the duration of the agreement. This protects you from market rises but means you do not benefit if prices fall.

A variable or flexible tariff moves with wholesale prices. This can work in your favour when markets are calm, but it creates risk when prices rise quickly.

The difference in cost between two businesses on different tariff types can be 30 to 70% for the same volume of energy.

Find out more in our guide to fixed vs variable tariffs.

Contract length and timing

Signing a long-term contract at the wrong time, such as during a period of high wholesale prices, can leave you locked into expensive rates for years.

Equally, renewing too late means missing competitive offers. Most business energy contracts have a specific renewal window. Missing it can trigger automatic rollover onto less favourable terms.

When you compare quotes through MoneySuperMarket, we help you find the right time to switch and which tariff type fits your risk appetite.

Usage inefficiencies that inflate your bill

Sometimes the problem is not the market or the contract, it's how your business uses energy.

Equipment left on outside trading hours

Heating, lighting, and equipment that run overnight or at weekends quietly add to your consumption. A single server left in sleep mode, an oven not fully switched off, or a kettle on standby all contribute.

Smart meter data can reveal usage patterns outside business hours. Even a 10% reduction in after-hours consumption can reduce your annual bill by a meaningful amount.

Inefficient or ageing equipment

Older equipment uses more energy per unit of output. An older refrigeration unit, for example, may draw significantly more power than a modern equivalent.

An energy audit, comparing your consumption against industry benchmarks, can identify where upgrades would pay for themselves. Switching to energy-efficient lighting can also have a big impact.

Poor insulation and heat loss

Draughty premises or inadequate insulation mean your heating system works harder than it needs to. This drives up gas consumption without improving comfort.

For businesses in older commercial premises, heat loss can account for a significant share of energy costs. Draught-proofing and roof insulation are among the most cost-effective improvements.

Hidden cost drivers

If you're on a time-of-use tariff that doesn't suit your usage, or your business uses a lot of energy, there are other things to consider.

Peak tariff periods

If you are on a time-of-use tariff, energy costs more during certain hours. This is typically in the mornings and early evenings when grid demand is highest.

Running heavy equipment during these windows costs more per unit. Shifting this activity to off-peak times, such as late evenings or overnight, can reduce your spend without reducing output.

Maximum demand charges

Larger businesses on half-hourly metering may face maximum demand charges. These are based on the highest level of power you draw at any point during a billing period — not just your total consumption.

A brief spike in demand, caused by multiple large machines starting at the same time, for example, can increase your bill substantially, even if your total usage is unchanged.

Staggering equipment start-up times can reduce these peaks and lower your costs.

Are you paying more than similar businesses?

It can be hard to know whether your bill is reasonable without a point of comparison. The figures below give an approximate guide to average monthly electricity costs by business size.

Business size	Approx. monthly electricity cost	Approx. annual cost
Micro (e.g. sole trader, retail unit)	~£263 per month	~£3,155 per year
Small (independent hotel, care home)	~£484 per month	~£5,811 per year
Medium (e.g. small office, workshop)	~£952 per month	~£11,149 per year
Large (e.g. manufacturing, warehouse)	~£1,282 per month	~£15,384 per year

_{Note: Prices are correct as of June 2026. Rates and bill size may vary according to your meter type and business location. The prices you’re quoted may be different from the averages shown. The figures shown are the average unit rates and standing charges received by Bionic from our panel of suppliers (inclusive of maximum Bionic commission), per business size thresholds, from June 1 to June 9, 2026.}

If your costs are above these figures, it is worth investigating which factors are driving the difference. Your contract type, tariff timing, and consumption patterns are the most likely causes.

How to identify the cause of your high energy costs

Working out why your bill is high takes a few straightforward steps.

1. Check your contract status. Find out when your current deal ends and what rate you are on. If you are out of contract, this is the most urgent issue to fix.
2. Review your unit rate. A competitive unit rate for small business electricity in 2026 is typically in the range of 25p to 30p per kWh, depending on your location and consumption profile. Anything significantly above this warrants investigation.
3. Look at your standing charge. Standing charges cover network costs and supplier overheads. High standing charges can indicate a poorly structured contract.
4. Check your consumption patterns. If you have a smart meter, review your half-hourly data. Look for usage outside business hours or unusual spikes.
5. Compare tariffs. Use MoneySuperMarket to compare current market offers. You may find a better deal available now.

When you get a quote with MoneySuperMarket, we compare options from trusted UK energy suppliers. You can see clearly which tariff suits your business size, usage pattern, and appetite for price risk.

Business energy costs FAQs

If you are still not clear why your energy bill is high, here are answers to the questions UK business owners ask most often.

Can I reduce my Climate Change Levy bill?

In some cases, yes. If your business is in an energy-intensive sector — such as manufacturing or chemicals — you may qualify for a Climate Change Agreement (CCA). A CCA lets eligible businesses pay a reduced CCL rate of 10% of the standard charge in exchange for meeting energy efficiency targets set by the Environment Agency. You apply through your relevant trade association, not directly through your energy supplier.

What is a half-hourly meter, and does my business need one?

A half-hourly (HH) meter records your electricity consumption every 30 minutes and sends data directly to your supplier. Businesses with a peak demand above 100 kW are legally required to have one. Many smaller businesses with demand between 70 kW and 100 kW are also moved onto HH metering. HH meters open up access to more granular tariff structures but also introduce maximum demand charges, which can increase costs if consumption is not managed carefully.

Is renewable energy cheaper for businesses?

Not necessarily in the short term. Green tariffs for business energy are priced competitively with standard tariffs, but they do not always offer a lower unit rate. The benefit is different: electricity sourced from certified renewable generators is CCL-exempt in certain circumstances, which could reduce your levy costs. If your supplier can provide a Levy Exemption Certificate (LEC) for the electricity you use, you may be able to reclaim or avoid the CCL element entirely.

Can I switch business energy supplier mid-contract?

It is usually possible, but there will likely be an exit fee. Most business energy contracts include early termination charges, which vary by supplier and how much of the contract remains. In some cases, the potential savings from switching to a lower-rate deal outweigh the exit cost. The best time to switch without penalty is during your contract’s renewal window, which typically opens 60 to 180 days before your end date.

What does a business energy standing charge actually cover?

The standing charge is a fixed daily cost you pay regardless of how much energy you use. It covers your share of maintaining the local distribution network, metering infrastructure, and certain supplier operating costs. Standing charges vary significantly between suppliers and contract types. For low-consumption businesses, a high standing charge can make up a disproportionate share of the total bill, so it is worth comparing this figure alongside the unit rate when getting quotes.

Does location in the UK affect what my business pays for energy?

Yes. Distribution network costs vary across Great Britain’s 14 licensed distribution network operator (DNO) zones. Businesses in Scotland and the South West often pay higher distribution costs than those in the Midlands or London, due to lower density of connections and longer grid distances. These differences show up in your unit rate and standing charge. When comparing quotes, this is one reason why a tariff that suits a business in Manchester may not be the best option for one in the Highlands.

What is a deemed contract, and why is it expensive?

A deemed contract is what a supplier puts you on when you take over premises without agreeing on a new deal, for example, when you move into a new office or workshop. Unlike out-of-contract rates, which follow an expired agreement, deemed contracts apply from day one of occupancy. They are typically set at the supplier’s highest published rates and carry no fixed term, meaning prices can change at short notice. Arranging a fixed deal as soon as you take on new premises is one of the most straightforward ways to avoid this.

Can I claim VAT back on my business energy bills?

If your business is VAT-registered, you can reclaim the 20% VAT on energy as input tax through your VAT return, provided the energy is used for business purposes. This does not reduce your upfront bill, but it does reduce your net cost over time. If you use energy for mixed purposes (part business, part personal) you can only reclaim the business proportion. Speak to your accountant if you are unsure how to apportion this correctly.