The Bionic guide to understanding business energy bills

Les Roberts, Senior Content Manager at Bionic
By Les Roberts, Senior Content Manager

Business energy bills can be tricky to understand, but it’s worth getting to know your way around them as they contain loads of useful information that can help you get a handle on your costs and figure out ways to cut your energy usage and save money. 

Here’s more on understanding your business energy bills, including the main costs you need to look out for before comparing business energy deals and switching suppliers.

How are business energy bills calculated?

You might think your business energy bills are worked out by simply looking at the amount of energy you use in a month, but there's more to it than that. The amount you're billed each month will depend upon the following:

  • The amount of energy you use - The number of kWh of energy you use will be multiplied by the unit rate you pay on your current tariff. For example, if you use 100 kWh of electricity in a month at a unit rate of 4.5p per kWh, you'll be charged £45 for that month's usage.
  • The standing charge - This is a flat daily charge that you pay regardless of how much energy you use. This rate will be multiplied by the number of days in the billing period. For example, if your standing charge is 45p per day and the billing period is a 31-day month, you'll pay £13.95 in standing charges. 
  • Taxes and levies - Additional charges like VAT and the Climate Change Levy will be added to your bill.

If you're eligible for any discounts, such as the reduced 5% VAT rate, this will also be shown on your bill and work towards the total amount you need to pay.  

Woman in pink top and wearing glasses on smartphone to energy supplier reading her business energy bill

What costs should you look out for on your business energy bill?

The format of your bills can vary depending on who supplies your business gas and electricity. This can make it difficult to find the information that’s most relevant to you and your business, but there are three key sections that should be included on most bills:

  • A breakdown of how much you’re being charged
  • The amount of energy you’re using (measured in kWh)
  • Your contract end date and information on your switching window

As a business owner, the amount you’re being charged for gas and electricity will most likely be your primary concern, so here’s an example British Gas business energy bill on which we’ve highlighted the costs that make up the total you pay each month.

If you’re with another supplier, your bill may be laid out slightly differently, but all of the same information should be on there. If not, you should get in touch with your supplier.

Page one of a British Gas business energy bill with payment giro attached
Page two of a British Gas business energy bill with details of how to pay

1. Bill date, bill number, and VAT number  - Your account number can usually be found somewhere near the top of your bill, and is used by your supplier to identify you as a customer. It’s handy to make a note of this, as you’ll need it when contacting your supplier directly. The VAT number is the number that your supplier has on record for your business’s registered VAT number. If it isn't right, let your supplier know as you may be overpaying or underpaying VAT. 

2. Account number and supplier contact details  - This is a unique number used to help identify your account. This section should also show your supplier's contact details. If you need to query any aspect of your account or make a complaint to your supplier, you can find contact details on your bill. Most suppliers will also include separate contact details depending on your query type. For example, if you wanted to inform your supplier that you’re moving premises, a separate contact number should be listed.

3. Contract information - Somewhere on your bill, your supplier should indicate the details of your current contract, including:

    • The name of the plan that you’re on
    • When it is due to renew
    • A contact number to discuss your plan.

Your supplier should write to you between 60 and 120 days’ prior to your contract’s end date to let you know it’s due to expire, but it’s always good to keep this date in mind so you have time to run an energy price comparison. If you’re short on time, our tech-enabled energy experts can help, and take away the hassle of searching the market by doing it for you. They will compare the best deals from our trusted suppliers. 

4. Billing period - This shows when your energy usage is being billed for. This is usually monthly, but may be quarterly.

5. Your reading type - Your bill can be based on two different types of reading:

    • Estimated readings – Used if you haven’t provided your supplier with a meter reading in some time.
    • Actual readings – More accurate, and based on a recent meter reading. If you’re on a half-hourly meter or smart meter, your bill will be based on accurate readings that are automatically sent from your meter to your supplier.

It’s worth noting that estimated charges can leave you paying too much, or not enough, for the energy that you’re using. It’s recommended that you provide your supplier with actual meter readings at least once every six months, but preferably once a month.

6. Outstanding balance from previous bills - This figure indicates if you have any outstanding balance from previous bills, but be aware that this can vary depending upon the time of year. If, for instance, you set up a direct debit in the warmer summer months, when energy consumption levels will be lower, you might find that the amount you’re paying isn’t enough to cover your energy consumption in the winter. If this is the case, you can fall into debt with your supplier and might get hit with a huge bill to make up for the shortfall.

7. Balance from this billing period - This cost indicates how much you are being charged for the energy that you have used during this billing period. This is broken down into the following two charges:

    • Unit rate - Measured in kilowatt-hours (kWh), this is the amount you pay for each unit of gas or electricity you use.
    • Standing charge - This is a flat daily rate to cover the cost of getting the energy to your property and is charged regardless of whether or not you use any gas or electricity.

For more information on the charges listed above, check out Bionic's guide to business energy tariffs and deals.

8. VAT charges - This shows the amount that has been added to your energy bill to cover VAT. This is charged at a rate of 20% but a discounted rate of 5% is available in some circumstances. This isn’t offered as standard so you'll need to check if your business is eligible. If your business is VAT registered, then you should be able to recover the VAT as input tax on your business expenses, subject to the normal VAT deduction rules. For more information, check out our guide to business energy and VAT.

9. Total amount owed - This is the figure that really jumps out, especially if you’re on an expensive energy deal, as it shows how much you must pay in total, including your previous balance, charges from the current month, as well as VAT.

This section will also show the final date by which the bill needs to be paid. If you fail to make a payment by this date, then your supplier may add on a late payment fee. Keep in mind, paying your business energy bill by cheque, or post, requires additional time, so you should keep this in mind when paying using these methods.

10. MPAN or MPRN number - The MPAN is a 21-digit number that can be found on your electricity bill, while the MPRN  is between six and ten digits long and will be on your gas bill. You may also find your meter serial number is shown on your bill, close to the MPAN or MPRN. If not, you can easily find this number on the meter installed at your premises. The MPAN, MPRN and meter serial numbers are all used by suppliers to quickly and easily identify the meter at your property.

11. Breakdown of charges - For a more detailed view of how your charges are calculated, your supplier should provide a detailed breakdown of your bill. As an example, consider a multi-rate contract where cheaper rates are offered during off-peak hours. In this instance, the breakdown will show how your usage is divided between the two different rates. If you find that you use very little energy during the cheaper off-peak hours, then perhaps there’s a better type of business energy contract suited to your business.

What costs are included in my business gas and electricity bills?

The two main costs that make up your business electricity and gas bills are the standing charge and unit rate.

What does ‘standing charge’ mean?

The standing charge is a fee that is charged daily to cover the cost incurred by the supplier to supply energy directly to your premises, as well as upkeep costs for the national grid. For more information check out our guide to standing charges.

What does ‘unit rate’ mean?

Measured in kilowatt-hours (kWh) the unit rate is a charge that covers each unit of electricity or gas that your business uses. If you’re on a fixed rate deal, this charge is set at the agreed rate (meaning it won’t change as energy prices increase, as on a variable deal) but your bills will still fluctuate, depending upon the amount of energy you use.

The standing charge and unit rate are the two costs that you need to look out for when running an energy price comparison. They can be broken down even further, and doing so can help you better understand how they can impact your overall business energy costs.

The main elements that contribute to your unit rates and standing charge are:

  • Wholesale costs - Part of your unit rate, this cost refers to the amount that business energy suppliers will pay to acquire the energy that you use. It’s worth keeping in mind that increases in cost on the wholesale market are traditionally passed on to customers and these increases are usually reflected through your cost per unit.
  • Transmission use of system charges (TNUoS) - Your TNUoS charge covers the supplier’s expense for maintaining the national grid, which is used to transport energy to your premises. Generally encompassed by your standing charge, the cost of your TNUoS can vary depending on your business’s geographical location.
  • Paying for distribution use of system (DUoS) - This charge covers the costs incurred by your Distribution Network Operator (DNO) – a company licensed to distribute electricity in your area – and includes day and night charges, as well as maximum supply requirements for larger businesses.
  • Climate Change Levy (CCL) - The Climate Change Levy is a tax on each unit of energy that commercial customers consume. The levy is designed to encourage businesses to improve their energy efficiency and reduce their carbon footprint. It is possible to become exempt from the CCL, but this is subject to the level of action you have taken to improve your energy efficiency.
  • VAT - VAT is added to your business energy bill by your supplier. VAT is usually charged at 20%, but it is possible to reduce this figure to as little as 5% of your business energy costs if you use less than 33kWh of electricity or 145kWh of gas per day. For more information, check out Bionic’s guide to VAT on business gas and electricity.
  • Feed-in Tariff (FiT) - The Feed-in Tariff (FiT) was introduced as an incentive to businesses and property owners who generate energy on-site through small-scale renewable electricity generation, such as solar panels and wind turbines. Ofgem, the energy regulator, charged energy companies a levy and this showed up as a separate payment on your bill. The Feed-in Tariff closed for new applicants in 2019, it's been replaced with the Smart Export Guarantee.  
  • Renewable obligation (RO) - The renewable obligation UK businesses are charged is one of a number of government initiatives to help meet climate change objectives by encouraging the development of large-scale renewable energy generation. Some suppliers will include RO as a pass-through cost which will appear as a separate item on your bills, while others will consolidate it as part of the overall supply rate you pay. Both these options are available to businesses with non-half hourly (NHH) and half-hourly meters HH) meters. RO was replaced by the Contracts for Difference scheme in April 2017, but existing RO contracts will continue to run until 2027.
  • Contracts for Difference (CfD) - Brought in to replace RO, CfD costs are met by a levy applied to energy suppliers, which are then passed on to consumers as the following pass-through charges on your bill:
    • Operational Costs Levy - A fixed unit rate per kWh that is charged to cover the running costs of the scheme set by the Local Carbon Contracts Company (LCCC).
    • Supplier Obligation Costs - Based on the subsidy paid to each CfD generator according to the volume of energy generated and wholesale electricity costs, this covers the amount of low-carbon electricity funded by CfD. This is a variable charge that is estimated at the start of each quarter and amended accordingly at the end of the quarter.
    • Quarterly fixed charges - Another fee that is calculated and revised as necessary, this is a fixed fee that’s paid each quarter to help negate the need for multiple reconciliations and complex calculations. 

If your business gas is supplied by independent gas transporters (IGT), your bill will also show any associated IGT charges. 

It’s also worth noting that failing to pay your business energy bills will impact your business's credit rating which could limit the energy deals you are eligible for in the future.

What affects the cost of your business energy bill?

Things like standing charges, taxes, government levies, and the amount of energy you actually use all go into making up the total amount you pay for energy. 

The price you pay for the energy you use can be affected by the wholesale cost of energy - that's the rate your supplier pays for the energy it provides to your business. 

If you're on a variable plan - such as your supplier's out-of-contract rates -  this means that your prices will rise and fall according to market conditions. The current uncertainty in the energy market has seen some business owners paying double the usual cost for their energy, as suppliers have put up their out-of-contract rates by an average of 100% since August 2021. 

Switching to a fixed-rate deal is the only way to protect against paying expensive out-of-contract rates and to shield your business from future price rises.   

Electricity generation costs can also have an impact. The higher the demand for energy, the higher the generation costs. Electricity costs can change by the hour, and higher demand means it costs energy generators more to produce power and this can push prices up. That's why it can cost more to run appliances between 9am and 5pm, when demand is high in homes and businesses than it does at night when less energy is used. 

Even world events can affect the cost of your energy bills, as we've seen with the recent price spikes following the conflict in Ukraine. For more information, check out our blog - Why are energy prices rising?

How much does energy cost for a business each month?

It's always been difficult to say how much a monthly business energy bill should be, purely because every business uses energy differently and all quotes are bespoke for each business. But the current volatility in the market makes it virtually impossible to predict prices.    

The tables below should give you an idea of how much energy your business should be using and the current rates it should be paying.

Latest 2023 electricity kWh prices by business size

Business sizeAnnual usageElectricity unit price per kWhElectricity daily standing charge 
Micro Business5,000 to 15,000 kWh30.0p92.3p
Small Business15,000 to 25,000 kWh29.3p84.0p
Medium Business25,000 to 55,000 kWh30.1p73.8p
Large BusinessMore than 55,000 kWh27.8p68.4p

What is an average business electric bill in 2023?

To give you an idea of how much your business electricity bill should be, here are the average electricity bills by business size.

Business size Average business electricity bill (per year) 
(based on annual usage of 10,000kWh) 
Small business£6,899
(based on annual usage of 22,500kWh) 
Medium business£14,567
(based on annual usage of 47,500kWh) 
Large business£15,540
(based on annual usage of 55,000kWh) 

Note: 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 quoted by Bionic per business size from November 1 to November 14, 2023. Rates do not include any Energy Bills Discount Scheme discount.

 Latest 2023 gas kWh prices by business size

Business sizeAnnual usageUnit price per kWhDaily standing charge 
Micro Business5,000 to 15,000 kWh11.2p56.1p
Small Business15,000 to 30,000 kWh9.9p40.1p
Medium Business30,000 to 65,000 kWh9.5p67.6p
Large BusinessMore than 65,000 kWh9.1p67.8p

What is an average business gas bill in 2023?

To give you an idea of how much you should be paying on business gas, here are the average business gas bills by business size. 

Business sizeAverage business gas bill (per year)
(based on annual usage of 10,000kWh) 
Small business£2,374
(based on annual usage of 22,500kWh) 
Medium business £4,759
(based on annual usage of 47,500kWh)
Large business£6,162
(based on annual usage of 65,000kWh)  

Note: 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 quoted by Bionic per business size from November 1 to November 14, 2023. Rates do not include any Energy Bills Discount Scheme discount.

For more information, read our guide on average business energy consumption. And to find out why prices are currently so volatile, check out our blog 'What is going on with energy prices in the UK?'

How to pay your business energy bill

The way you pay your energy bills can also affect the amount you pay overall, so it’s worth taking the time to consider how you pay for your energy and think about changing your payment method if it’ll save you money.

There are a number of different methods of payment (listed on your bill), including:

  • Direct Debit - Direct debit is the most common method of payment for business energy customers as it’s not only the most convenient, but some suppliers will also offer a discount for paying this way. If you pay by a fixed direct debit, it’s important to keep an eye on how much energy you are using. It may not cover the extra energy that your business may use throughout the colder winter months. It’s recommended that you review your direct debit amount at least once a year to ensure that it is still sufficient to cover your energy usage – failing to do so can leave your account in credit, or debt.
  • BACS - Some business owners prefer BACS payments instead of a fixed direct debit as it allows them to change the amount they pay month-to-month based on how much energy they have used. It means you’ll have to take action each time you need to pay your business energy bill, which can be time-consuming – but also gives you greater control over your outgoings.
  • Debit or Credit card - Many suppliers offer the option to pay via credit, or debit card. To do so you will need to contact your supplier’s payment department directly. This number can usually be found on your bill. Much like BACS, paying by this method means you must contact your supplier each time you wish to make a payment, which is not ideal for a busy business owner.
  • Cheques or Giro - Another option is to pay by cheque or Giro slip – which can be found at the bottom of your business energy bill. These need to be sent by post to an address that is defined on your bill. It’s important to take into account postage – typically between three and five days prior to the final payment date – to avoid being hit with late charges.

Picking the right payment method for you can be as much about keeping costs down as it is about the convenience that certain methods can offer busy business owners. If you feel another method of payment may suit your business needs better, you should contact your supplier.

What is an average business energy bill?

Bills are ultimately dictated by your unit rate and your energy usage, and the cost of an average business energy bill is difficult to determine because every business is unique and located in different areas, which means usage can vary dramatically even between two similar businesses in the same industry.

The best way to find out whether you’re paying over the odds is to look at the unit rates available to businesses of your size. For more information on average business energy prices and bills, check out Bionic’s guide to average business energy consumption.

Do businesses pay more for energy?

Although business energy and domestic energy are supplied through the same pipes and cables, sometimes by the same suppliers, you could find your business energy bills are higher than your household ones. There are two main reasons why businesses might pay more than households for their energy:

  • They use more energy - no matter what your unit rate is, the more energy you use then the higher your bills will be.
  • They pay more VAT - although there are exceptions, most businesses pay the higher VAT rate of 20% on business energy, compared to the 5% paid on domestic energy.

But it's often the case that business energy rates are lower than household energy rates. This is because business owners can negotiate rates that are based on their needs, and higher energy demand is usually rewarded with lower rates. This is why large business energy rates are usually cheaper than those offered to small businesses

But the ongoing energy crisis has also skewed this, as there is no price cap on business energy. This means there's no limit to the amount suppliers can charge commercial customers but there is a cap on the unit rates and standing charges on domestic energy bills.

The best way to make sure you're on the most suitable rates and deal for your business is to run a business energy comparison. Pop your postcode in the box on the right to get started. 

Why are your business energy bills so high?

The prices offered in a quote for business energy are known as acquisition rates and are generally offered to new customers. These prices tend to be more favourable to encourage people to become customers and the main reason why you can usually cut costs by switching suppliers. 

There are a number of reasons why your energy bills could be high, to the point    might not be able to pay your business energy bills, including:

  • You've been billed inaccurately - If you're hit with an unusually high energy bill, you need to first make sure that you've been billed correctly. If your bills are estimated by your supplier, they may not be accurate and you might be overcharged. To avoid this, take regular meter readings and send them to your supplier. It might be worth fitting a smart meter that sends automatic readings to your supplier.
  • You're on out-of-contract rates - If you let a fixed-rate energy deal expire then you'll be rolled onto your suppliers out of contract rates. These are usually higher than those offered on a fixed contract and could mean higher energy bills. 

"Remember when your contract ends, you'll automatically be rolled onto your supplier’s more expensive out-of-contract rates - to avoid overpaying, you’ll need to run a comparison and switch energy suppliers, or switch to a better deal with your current supplier" - Ed Whitworth, Head of Energy Performance

  • You're on deemed rates - If you move into new premises without arranging an energy deal there, the property's current supplier will place you on deemed rates. These are usually among the highest rates offered by suppliers and could lead to higher energy bills. If this is the case, speak to the team at Bionic to arrange a new contract. Deemed rates are priced this way to make up for the financial risk suppliers take when they supply energy to a customer who they know little about and have no record of their credit history or what the business does.

What if you can't afford to pay your business energy bills?

If you can't afford your business energy bills, it's important you speak to your supplier as soon as possible to sort out a repayment plan. If not, your supply could be cut off. Although disconnection is usually the last resort for suppliers, the plug could be pulled on your power if you don't work out a way to deal with the debt within 30 days of your missed payment. 

To make matters worse, disconnection usually comes with a fee that is added to the money you owe. If you're reconnected, you'll need to pay another fee. 

Energy debt is considered a priority debt, which means it could be passed onto a debt recovery company. This can affect your business credit score and make getting future credit more difficult. 

Whether you've been overcharged or you don't have the money to cover your energy bills, it's important to speak to your supplier as soon as possible to sort out the issue.

If you've been told your supply will be disconnected, give Citizens Advice a call on 0808 223 1133 or chat online with one of their energy advisors.

How to switch business energy suppliers?

To switch to a better business energy deal from Bionic’s trusted panel of suppliers, just give us your postcode and our tech-enabled experts will use smart data to find an energy deal that suits the unique needs of your business.

You just then need to give us the nod and we’ll take care of the rest - letting your old and new suppliers about the switch to make sure the whole thing runs smoothly, on time and with no disruption.

We’ll even keep an eye on your contract's end dates to make sure you’re never rolled on to your supplier’s more expensive standard rates. To become a Bionic business, just go to and give us your business name and postcode or give us a call on 0800 970 0077.