Explainer
Understanding business electricity bills
Five lines decide what you pay. Here’s where they are, what they mean, and the checks that catch overcharges before they compound.
Part of our business electricity guides
A business electricity bill boils down to your account details, your MPAN, the billing period, the meter reads, and four charges: units, standing charge, Climate Change Levy and VAT. Everything else on the page is decoration. Ten minutes with the right five lines tells you whether a bill is right, and most businesses never spend them.
- Check whether reads are marked actual (A) or estimated (E) before anything else. Estimates are where disputes start.
- The unit rate on the bill should match the contract. A fraction of a penny of drift compounds quietly across a year.
- VAT at 20 per cent isn’t automatic. Low-usage sites and charities can qualify for 5.
Finding your way round it
Top of the bill: your account number and your MPAN. They’re different things doing different jobs. The account number identifies your relationship with the supplier; the MPAN identifies the physical supply point, and it’s the one you’ll need for quotes, switching or a dispute. Worth knowing where it lives before you need it in a hurry.
Then the billing period and the meter reads. Every read is marked actual or estimated, and the single most useful habit in business energy is noticing which. An estimated read that runs high means you’re financing the supplier; one that runs low means a catch-up bill is quietly building. Either way, submitting a real reading resets the drift.
The four charges
The arithmetic is short. Your consumption in kWh times the unit rate. The number of days in the period times the standing charge. The Climate Change Levy on business use, shown as its own line. Then VAT on the subtotal.
That VAT line deserves a look rather than a shrug. Most businesses pay 20 per cent, but low-usage sites and charities can qualify for 5, and the wrong rating persists for years once it’s in the system. Our guide to VAT on business electricity covers when the reduced rate applies and how to claim it.
The half-hourly extras
Larger sites see lines smaller ones don’t. A half-hourly supply is billed on its actual usage pattern, so capacity charges appear, priced against the kVA your site has reserved, along with reactive power charges where equipment draws more than it usefully consumes.
These lines reward attention precisely because nobody gives them any. A site paying for reserved capacity it stopped needing two tenants ago is a cliché of the audit trade.
The checks worth doing quarterly
Four, and they take minutes. Does the unit rate on the bill match the contract? Are the reads actual? Is the VAT rating right for the site? And is the Climate Change Levy being applied where it should be, and relieved where it shouldn’t?
Where a check turns something up, historic overcharges can often be challenged years back, provided the paperwork survives. That’s the core of bill validation, and it’s what our bill audit and refunds service does line by line, for electricity and water both.
A five-minute monthly routine
Read the meter on the same day each month and log it somewhere that survives staff changes. Glance at the rate line against the contract. File the bill where the next person could find it. That’s the whole routine, and it prevents the two expensive failure modes: estimate drift and rate drift.
Businesses that do this catch problems inside one billing cycle. Businesses that don’t tend to discover them at audit, years later, when the evidence trail is thinner and some of the money is beyond reach.
Common questions
What’s the difference between actual and estimated readings?
An actual reading came from the meter; an estimated one came from an algorithm’s best guess. Bills built on estimates drift from reality, sometimes for months. If your bills show E after E, submit a real reading and the next bill trues up.
Why has my bill gone up when usage hasn’t?
Three usual suspects: your contract ended and billing moved to out-of-contract rates, a new contract started at current market prices, or an estimated read overshot. The bill itself will tell you which, once you know where to look.
What do I need my MPAN for?
Quotes, switching and disputes. It’s the unique identifier for your supply point, printed on every bill, and it’s one of the first things any supplier or broker will ask for. It doesn’t change when you switch.
Can we claim back electricity overcharges?
Often, yes, where there’s a genuine billing error: wrong rates applied, estimates never corrected, an incorrect VAT rating. Claims can frequently reach back years if evidenced. Our bill audit service works on exactly this, paid from what’s recovered.
What is the Climate Change Levy and does every business pay it?
A government levy on business energy use, shown as its own line on the bill. Most businesses pay it; very low users, charities and sites with climate change agreements can qualify for relief. The detail is in our CCL glossary entry, and a wrongly applied levy is a classic audit find.
Why are there two meter reads on one bill?
Opening and closing. The bill charges for the units between them, so both need to be right. If the opening read doesn’t match the previous bill’s closing read, something has been estimated in between, and that’s worth a query.
Your questions on this, answered in order
The questions businesses actually ask about this topic, in the order they tend to ask them. Each answer leads to the next; where we can help, there is a link.
Why are business electricity standing charges so high?
Standing charges cover fixed costs of supplying your premises, including network charges, metering and some policy and supplier costs. Recent changes to how network residual charges are recovered moved more cost into fixed daily charges, and TNUoS rose again from April 2026. Larger sites may also pay separate capacity charges based on their agreed supply capacity.
Can I get a business electricity tariff with no standing charge?
Some suppliers offer tariffs with low or no standing charge, but the cost is usually recovered through a higher unit rate. That can suit very low-usage sites, such as storage units or seasonal premises. For most businesses, comparing the total annual cost at your actual usage is more useful than focusing on either charge alone.
How do I compare business electricity quotes properly?
Work out the total annual cost using your actual usage, including unit rates, standing charges, any capacity charges, CCL and VAT. Check the contract length, whether it’s fixed or pass-through, the start date and the broker fee shown in the principal terms. Comparing quotes on the same basis avoids being drawn to a headline rate alone.
Can someone run a business electricity quote for me?
Yes. Clearsight Energy can compare suitable contracts across the suppliers on our panel for you. A recent bill helps, though your MPAN, address, current supplier, contract end date and an idea of annual usage are usually enough to start. We’ll set out the options, the term, the rates and the broker fee so you can decide in your own time. Get in touch →
What is a capacity charge on a business electricity bill?
A capacity or availability charge is a monthly cost based on your agreed supply capacity in kVA, the maximum demand your connection is set up to deliver. It mainly appears on larger half-hourly sites. You pay it whether or not you use that capacity, so it’s worth checking it reflects your real needs. Exceeding it can lead to excess capacity charges.
What are excess capacity and reactive power charges?
Excess capacity charges apply when demand exceeds your agreed supply capacity. Reactive power charges apply when equipment such as motors or older lighting draws power inefficiently, measured in kVArh. Both appear on half-hourly bills. Power factor correction equipment can reduce reactive charges, while reviewing your capacity against actual peaks helps with excess charges.
Is my capacity set correctly for my site?
Compare a year of half-hourly peak demand against your agreed supply capacity. Consistent headroom may mean you’re paying for unused capacity, while regular breaches suggest you need more. Any change is requested through your network operator. A bill and data review can show whether a change is worth pursuing before you apply.
Can someone check my business electricity bill for errors?
Clearsight Energy offers bill validation, which compares your invoices against your contract rates, meter reads, standing and capacity charges, VAT and CCL treatment. Common findings include estimated reads, wrong VAT rates and charges carried over after a move. Send us recent bills and the contract and we’ll explain what we find and what can be raised with the supplier. Get in touch →
How do I reduce my agreed supply capacity?
Review at least a year of half-hourly data to find your true peak demand, then ask your supplier or network operator to reduce the agreed capacity, leaving sensible headroom. The request goes to the network operator, which updates the charge. Check any minimum period or terms before applying, as changes aren’t always straightforward to reverse.
Could reducing capacity cause problems later?
It can. If your demand later exceeds the new figure, you may pay excess capacity charges, and getting capacity back may need a fresh application and possibly a connection charge if the network has used the spare capacity elsewhere. Factor in planned changes such as EV charging, new equipment or heat pumps before reducing.
Can someone review my capacity before I make a change?
Clearsight Energy can review your half-hourly data and capacity charges, and explain whether a reduction looks sensible given your plans. We’ll set out the possible saving and the risks plainly. Send your bills and data, and tell us about any expansion or EV charging planned. Get in touch →
Why do I pay a standing charge on an empty property?
The standing charge covers keeping the supply connected and metered, so it applies even when no electricity is used. If a property will be empty for a long period, landlords sometimes ask for the supply to be de-energised, though reconnection has costs. Low-standing-charge tariffs or void property contracts may be options for some landlords.
Can you help landlords manage electricity on vacant units?
Clearsight Energy works with landlords to manage supplies between tenancies. We can review contracts and standing charges on void units, take meter readings at the right points, and help set up the right arrangement for incoming tenants. Getting change of tenancy steps right avoids disputes later on who used what. Get in touch →
What does day and night rate mean on my business electricity bill?
It means your meter records usage in two registers, a day rate and a cheaper night rate, usually across a set seven-hour window overnight. This is often called Economy 7. Your bill shows a reading and a price for each register. Whether it helps depends on how much of your electricity you actually use during those night hours.
Is a day and night tariff worth it for my business?
It tends to pay off when a meaningful share of your use falls overnight, such as refrigeration, storage heating, night production or overnight EV charging. Day rates on these tariffs are often higher than a single rate, so a business that mostly uses power in office hours can pay more. The only reliable answer comes from your actual day and night split.
How do I work out how much electricity my business uses at night?
Take readings from both registers at the start and end of a period, or use the day and night figures on your bills, then work out the night share of the total. A smart or half-hourly meter gives the most accurate picture. Repeat it across seasons if you can, because heating and lighting can shift the split over the year.
Can I change my business meter from day and night to a single rate?
Usually, yes. A smart meter can often be reconfigured remotely, while an older meter may need to be exchanged. Your profile class would change, which affects how the supply is priced. Ask your supplier what’s involved and whether any charge applies, and make sure any new quotes are based on the meter setup you’ll actually have.
Will my meter setup affect my business electricity renewal quotes?
Yes. Suppliers price each register separately, so quotes need the correct profile class and a realistic day and night split. If the split used is wrong, one quote can look better on paper and cost more in practice. Asking for comparisons on the same usage figures, and checking the annual cost rather than the unit rate, keeps things fair.
Can someone compare single-rate and day and night quotes for my usage?
Yes. Clearsight Energy can price both structures on your actual usage pattern and show the annual cost of each side by side. Your MPAN, recent bills or meter readings from both registers, and your contract end date are enough to begin. We’ll explain the difference in plain terms and set out our fee with the options. Get in touch →
My business meter is controlled by a Radio Teleswitch, what do I need to do?
The radio signal that switches these meters between rates is being phased out, and The RTS signal was switched off on 30 June 2026 and the remaining meters are being replaced. If you have one, contact your supplier to book a replacement. Without it, timed heating or hot water, and your rate switching, may stop working as expected.
Will replacing my Radio Teleswitch meter change my tariff?
It can. Replacement is usually a smart meter, which may be set up with a similar time-of-use pattern or a different one, depending on what the supplier offers. Check the rates and timings on the first bill after the exchange, and confirm any storage heating or timed circuits still run at the cheaper time.
Can someone check my bills after my meter was replaced?
Clearsight Energy’s bill validation can check that the closing reads on the old meter and opening reads on the new one match, and that the right rates and registers are being billed. Meter exchanges are a common source of estimated or doubled charges. Send the bills either side of the exchange and any photos of readings you have. Get in touch →
Could a battery help my business use cheaper overnight electricity?
It can, if your day and night price gap is wide enough and you have daytime demand to shift. A battery charges at night or from solar and discharges at peak times. The economics depend on installation cost, battery life and your tariff, so it’s worth looking at your half-hourly data before committing.
Can I get a solar and battery survey for my business premises?
Clearsight Energy can arrange a commercial assessment that looks at your roof, your usage pattern and whether a battery would add value alongside solar or on its own. Having a year of usage data, ideally half-hourly, makes the figures more realistic. We’ll explain the assumptions behind any payback estimate so you can judge it fairly. Get in touch →
What are non-commodity costs on a business electricity bill?
They’re everything in your price apart from the wholesale energy itself. That includes transmission and distribution network charges, balancing costs, and government policy costs such as the Renewables Obligation, Contracts for Difference, the Capacity Market and the nuclear funding levy, plus metering. They now make up a large share of a business unit rate and are reviewed through the year.
What is TNUoS and why is it going up?
TNUoS is the charge for using the high-voltage transmission network. It’s rising because of large investment in grid infrastructure, more interconnectors and fixed costs being spread over lower demand. From April 2026 total transmission revenue was reported up by around 61%. For most smaller businesses it’s built into the unit rate or a daily charge rather than shown separately.
What are DUoS red, amber and green time bands?
They’re time periods used to set distribution network charges. Red is the most expensive, usually a few hours on weekday late afternoons and early evenings, amber is shoulder time and green is overnight and weekends. The exact times vary by network region. Half-hourly settled sites see these differences most directly, which makes the timing of use matter.
Can moving usage out of the red band lower my business electricity bill?
For half-hourly settled sites on contracts that reflect network charges, yes. Moving flexible loads such as pumps, chillers, charging or batch processes outside the red band can reduce distribution costs. As market-wide half-hourly settlement rolls out, more smaller sites may see time-based pricing too. Your half-hourly data shows how much use currently falls in the red band.
What equipment helps a business shift electricity use away from peak times?
Simple timers and building management settings are often the first step. Thermal storage, such as pre-cooling or hot water storage, lets you use power earlier. Batteries can cover peaks directly, and on-site solar reduces how much you draw from the grid during the day. The right mix depends on your usage profile and which loads can move.
Can I get a solar and battery survey for my business?
Clearsight Energy can arrange a commercial assessment that looks at your roof, your half-hourly profile and how much peak demand solar or a battery could realistically cover. Sharing a year of usage data makes the estimate more reliable. We’ll explain the assumptions behind any savings or payback figures so you can weigh them up properly. Get in touch →
Can energy-intensive businesses get relief from non-commodity costs?
Yes, for eligible businesses. The long-standing Energy Intensive Industries scheme gives qualifying firms relief from some policy and network costs. The government’s British Industrial Competitiveness Scheme is set to remove Renewables Obligation, Feed-in Tariff and Capacity Market costs for eligible manufacturers from 2027. Eligibility is based on sector, size of use and electricity intensity.
Does my manufacturing business qualify for the British Industrial Competitiveness Scheme?
Industry summaries say you’ll need to be a GB manufacturer in an eligible SIC code, registered at Companies House, using over 33 MWh a year, and to pass an electricity intensity test against gross value added. The share of site electricity used for manufacturing affects how much relief applies. The Department for Business and Trade runs the eligibility assessment.
How do I apply for the British Industrial Competitiveness Scheme?
Applications go through the Department for Business and Trade. Industry guidance reports a first eligibility window from 1 October to 30 November 2026, with later entry points at scheme-year starts. You’ll typically need your SIC code, site consumption data and financial information to show electricity intensity. Check the official guidance before applying, as details can be refined.
Will BICS change how I should buy my business electricity?
It’s worth checking that any contract you sign from now can pass through levy exemptions once you’re certified, and that the supplier knows your status. Fully fixed contracts priced with these levies included may need adjusting. Reviewing your first bills after the exemption starts helps confirm the relief is actually being applied.
Can someone check my bills reflect the levy relief I’m entitled to?
Clearsight Energy’s bill validation can check that your invoices show the correct treatment for any relief you hold, alongside your rates, reads, VAT and CCL. It can also help when you’re comparing renewal quotes, so exemptions are priced in consistently. Send your certificate details and recent bills, and we’ll explain what we find. Get in touch →
What is the nuclear RAB levy on my business electricity bill?
It’s a policy charge that funds new nuclear projects, including Sizewell C, under the regulated asset base model. Suppliers pay it and pass it on to customers, either within the unit rate or as a pass-through cost. The rate is set quarterly, and industry figures show it rising during 2026. Your contract terms decide whether changes reach your bill mid-contract.
How do I compare quotes that show non-commodity costs differently?
Put every quote onto the same annual usage and work out a total annual cost, including standing charges. Then note which costs are fixed for the term and which can move. A quote with a lower headline rate but more pass-through exposure isn’t directly comparable with a fully fixed one, so the risk needs weighing alongside the price.
Can someone run a business electricity quote for me?
Yes. Clearsight Energy can compare suitable contracts on the same usage and set out which charges are fixed and which could change, in plain language. Your MPAN, address, end date and usage are usually enough to start. We’ll explain the options, the terms and our fee before you decide. Get in touch →
What is an MPAN?
An MPAN (Meter Point Administration Number) is a unique identifier assigned to every electricity meter point in the UK. You will need your MPAN when comparing business electricity suppliers, as it tells the new provider exactly which meter they are quoting for. Our guide to MPAN numbers explains the full breakdown of what each part of the number means.
Where can I find my MPAN?
Your MPAN can be found on your business electricity bill, usually labelled as the “Supply Number” or “Meter Point Administration Number”. It is a 21-digit number starting with S. If you are not sure where to look, our MPAN number explained guide shows you exactly where to find it and how to read it.
When comparing business electricity contracts, what is a standing charge?
A standing charge is a fixed daily fee on your electricity contract, regardless of how much energy you use. It covers the costs of maintaining the supply connection, metering, and network infrastructure. The standing charge is set by the supplier and appears separately from the unit rate (measured in kWh) on your bill. There’s a more detailed breakdown in our guide to business energy standing charges. When comparing electricity providers, it’s worth looking at both the unit rate and standing charge together, as a low unit rate with a high standing charge can still work out expensive.
What does kWh stand for?
kWh stands for kilowatt-hour, which is a unit of measurement used to quantify electricity consumption. It represents the amount of energy used by a device or system that consumes one kilowatt of power for one hour. In the context of comparing business electricity contracts, kWh is used to indicate the amount of electricity consumed over a specified period, typically measured in kilowatt-hours per month or year. This measurement is essential for understanding electricity usage and determining the cost associated with different contract options.
Why are business electricity standing charges so high?
Standing charges cover fixed costs of supplying your premises, including network charges, metering and some policy and supplier costs. Recent changes to how network residual charges are recovered moved more cost into fixed daily charges, and TNUoS rose again from April 2026. Larger sites may also pay separate capacity charges based on their agreed supply capacity.
What does day and night rate mean on my business electricity bill?
It means your meter records usage in two registers, a day rate and a cheaper night rate, usually across a set seven-hour window overnight. This is often called Economy 7. Your bill shows a reading and a price for each register. Whether it helps depends on how much of your electricity you actually use during those night hours.
What are non-commodity costs on a business electricity bill?
They’re everything in your price apart from the wholesale energy itself. That includes transmission and distribution network charges, balancing costs, and government policy costs such as the Renewables Obligation, Contracts for Difference, the Capacity Market and the nuclear funding levy, plus metering. They now make up a large share of a business unit rate and are reviewed through the year.