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.
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.
Quick snapshot
- 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.
Frequently asked 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.
“No pressurised selling was involved, just clear and constructive advice.”
Send us a recent bill and we’ll tell you if an audit is worth running.