How to read your UK business electricity bill in 2026: a line-by-line walkthrough

Why business electricity bills look so different from domestic ones

Open a domestic electricity bill and you will see four numbers: a unit rate per kWh, a daily standing charge, a total kWh used in the period, and a final amount. Open a business electricity bill — particularly a half-hourly one — and you may see twenty-five lines, each with its own unit, its own multiplier and its own short-form acronym. Most of those lines are either pass-throughs of an underlying network or government cost, or they recover a structural cost that is bundled invisibly into the headline unit rate on a domestic bill.

This walkthrough goes line by line through a typical UK non-domestic electricity bill in 2026. We use a half-hourly bill as the worked example because it is the most complex; the same logic applies, in reduced form, to non-half-hourly profile-class bills. Throughout, we link the bill line to the underlying mechanism — DUoS, TNUoS, BSUoS, capacity charging, the Climate Change Levy and so on — so that, by the end, every line has a name and a reason to be there.

If a line on your own bill does not match what we describe, that is itself useful information: either your contract has a non-standard structure, or the supplier is recovering something through that line that they should be disclosing differently. Either way, the audit starts with the bill in front of you.

The header block: who you are and what you used

The top of every business electricity bill carries a fixed identifying block. The items to look for, and what they should match:

• Account number — your reference with the supplier. Stable over the life of the contract.
• MPAN (top line and bottom line) — the unique identifier for the supply point. The bottom-line core MPAN is thirteen digits; the top line encodes profile class, meter time-switch class, line loss factor and distributor. Validate this against the central industry database — a wrong MPAN is the single most common deemed-contract trigger.
• Registered occupier — should match your trading entity exactly. Where it does not (typically because a tenancy or operator change has not been formally novated), you are exposed to deemed-rate billing and to disputes about who is liable for what.
• Meter serial number — the physical meter's reference. Useful for fault tracking and for cross-checking that the registered meter on the central database is the same as the physical meter on site.
• Billing period — typically calendar month. Check the start and end dates align with the previous bill's end date; gaps and overlaps both produce reconciliation errors.
• Total kWh used in period — should reconcile against the meter reads on the bill (opening and closing) for non-half-hourly supplies, or against the half-hourly data file for HH supplies.

If you cannot find any of these on your bill, that is the first conversation to have with the supplier. Suppliers are required to present this information clearly under Standard Licence Conditions; obscuring it is itself a regulatory issue.

Unit rates and standing charge

Below the header, the bulk of the consumption charges sit. For a non-half-hourly profile-class supply, there are typically two lines: unit rate in pence per kWh, multiplied by the kWh used in the period, plus a standing charge in pence per day, multiplied by the number of days. For an HH supply, unit rates can be banded:

• Day rate — typically 07:00 to 23:00 weekdays, sometimes split further into peak and off-peak.
• Night rate — overnight hours, lower than day.
• Weekend rate — sometimes separately priced, sometimes folded into the day or night rates.
• Evening peak (Red band) — the highest band, typically 16:00 to 19:00 on weekday winter evenings.

The unit rate is what you negotiated in the contract; the standing charge is what you pay regardless of consumption. For the unit rate, compare the figure on the bill against the figure in your signed contract — they should match exactly. If they do not, that is either an indexation event (some flexible contracts pass through wholesale movements monthly) or a supplier error. Both warrant a written explanation.

The unit rate itself is built up from several underlying components, most of which are not separately disclosed on a fixed-price bill but are visible on a pass-through or flexible bill. Those components are: wholesale energy, supplier margin, BSUoS, capacity-market levy, RO and FiT (renewable obligation costs), and any commission paid to a third-party intermediary. Where you have a fixed-price contract, all of these are bundled into one unit rate; where you have a pass-through contract, they appear as separate lines.

Capacity and reactive charges

For half-hourly supplies, there are usually two further lines below the unit rate and standing charge:

• Available Capacity in kVA, charged at a daily standing rate per kVA. This is the agreed maximum demand of the supply, written into the connection agreement, and is paid whether or not the capacity is used.
• Reactive power — charged in pence per kVArh on reactive consumption above a threshold, typically when reactive consumption exceeds about 33% of active consumption.

These two lines are where the most consequential procurement decisions sit for half-hourly customers. Available Capacity is set in the connection agreement and is rarely revisited; we routinely find HH sites with a kVA allocation set for project-day worst case and never trimmed back, attracting a permanent capacity charge in proportion to the over-allocation. Under DCP161, sites that exceed Available Capacity pay a multiplied excess rate — so the capacity allocation should be set to actual peak with a sensible margin, not to installed connection capacity.

Power-factor correction is the standard fix for reactive charges. Where reactive consumption is routinely above the threshold, a PFC capacitor bank sized to the inductive load typically pays back inside twelve to thirty-six months, and the saving is durable — it does not depend on continuing to negotiate, it just stops the meter charging the reactive line.

DUoS bands explained

For half-hourly supplies, distribution charges are typically broken out separately rather than bundled into the unit rate. They appear as three Red/Amber/Green time-of-day banded rates, plus a fixed band entry that recovers the residual element under the Targeted Charging Review:

• DUoS Red — typically applied to the weekday evening peak (16:00 to 19:00 in most DNO areas, with regional variation). The most expensive band, designed to incentivise demand reduction at network peak.
• DUoS Amber — shoulder periods.
• DUoS Green — overnight and weekend, the cheapest band.
• DUoS residual fixed band — a fixed daily amount based on your TCR band, set by reference to your historic agreed capacity and net volume. This element is no longer volumetric and is not affected by real-time consumption.

For procurement and demand management, the implication is that shifting consumption from Red to Amber or Green still saves money (on the forward-looking element of DUoS), but the savings are smaller than they were before TCR took effect. The residual fixed band is set by historic data, so today's shifting affects future band allocation only at the next reassessment — typically annual.

For non-half-hourly profile-class supplies, DUoS is bundled into a single unit rate without time-of-day banding, and the residual fixed element appears as part of the overall standing charge.

TNUoS, BSUoS and the residual mechanism

Three more lines round out the network-charge stack on an HH bill:

• TNUoS residual — a fixed daily charge based on your TCR band, recovering the residual element of transmission cost. Like the DUoS residual, this is now decoupled from real-time use.
• TNUoS forward-looking — the locational signal element of transmission charging, reflecting where on the network you are connected. Smaller than the residual but still volumetric and time-banded.
• BSUoS — Balancing Services Use of System. Since April 2023 this has been a fixed daily charge for demand customers, calibrated annually rather than half-hourly. Predictable and budgetable.

The combined effect of the TCR and the BSUoS reform is that a much larger fraction of your network-charge bill is now fixed and predictable than was the case three or four years ago. That is good for budgeting and contract comparison. It is less good for customers who built business cases on Triad-period peak shaving, because the residual transmission element is no longer responsive to real-time behaviour.

CCL and VAT

The bottom of the bill carries the tax lines:

• Climate Change Levy (CCL) — a per-kWh tax applied to non-domestic energy supply. The 2026 standard rate for electricity is in the range of 0.78p per kWh; rates are confirmed annually in the Budget. CCL appears as a separate line; check the rate against the published HMRC figure for the period.
• VAT — typically 20% on non-domestic supply, but reduced to 5% on qualifying domestic-style supply (charity-controlled premises used for non-business purposes, agricultural supply with a valid declaration, low-volume de minimis exempt supply). The VAT rate applied should be evidenced by a declaration certificate held by the supplier.

CCL eligibility for reduced rate or exemption is one of the more common audit findings. A meter that has been through a change of use — say, a former office that is now charity-run, or a former workshop that is now an agricultural building — frequently retains the original VAT and CCL coding regardless of the change. The supplier will not proactively reclassify; the customer must declare. Where the misclassification has been in place for years, the recovery is HMRC-routed through the supplier and can be backdated up to four years where eligibility is evidenced.

Reading a microbusiness bill

If you qualify as a microbusiness — under any one of the three Ofgem thresholds (under 10 employees and turnover or balance sheet under €2m, or annual electricity use under 100,000 kWh, or annual gas use under 293,000 kWh) — your bill will look simpler than the HH example above, and additional protections apply:

• Pre-renewal notification — the supplier must send written notice between 49 and 1 days before any contract anniversary. Check your inbox and post for it; if it was not sent, the rollover is challengeable.
• Back-billing protection — twelve-month limit on how far the supplier can recover for previously unbilled use. Cite this in any back-billing dispute.
• Termination rights — you can terminate a rollover with 30 days' notice from any anniversary.
• Energy Ombudsman access — after eight weeks of an unresolved supplier complaint, you have the right to escalate.

Suppliers are required to ask whether you qualify when you sign or renew, but in practice the protections are routinely under-applied because the customer never asserts the status. Asserting microbusiness status formally on day one of every contract is one of the highest-leverage steps a small business can take to protect itself.

The five lines that hide the most overcharge

If we had to pick the five lines on a non-domestic electricity bill that most often hide an avoidable cost, in our practice these are:

1. Standing charge. The supplier-set fixed daily cost. On a deemed or rollover contract, this can be two to three times the rate available on a tendered contract. On a long-running fixed contract, it can be locked above current market. We benchmark against current tendered rates for the relevant profile.
2. Available Capacity. The kVA allocation. Set for project-day worst case and rarely trimmed. Renegotiate downwards where headroom is consistently unused.
3. Reactive power. Hidden in plain sight on the bill. Power-factor correction equipment typically pays back fast where the threshold is routinely exceeded.
4. VAT and CCL coding. Wrong rates persist for years on meters that have changed use. Backdated reclaims through the supplier are HMRC-recoverable up to four years.
5. Commission disclosure. Where the contract was placed by an intermediary, the commission element is supposed to be disclosed in writing under the 2024 supplier-licence rule. If you have not seen the disclosure, ask the supplier directly — they hold the figure.

A worked example

Consider a single-site retail flagship store on a half-hourly supply with annual consumption of 350,000 kWh, an Available Capacity of 200 kVA, a peak measured demand of 130 kVA, and a power factor of 0.88 (just below the typical 0.95 threshold). The signed contract has a unit rate of 23.5p/kWh average, a standing charge of £1.20/day, and capacity charged at 14p/kVA/day.

• Energy: 350,000 kWh × 23.5p = £82,250.
• Standing: 365 × £1.20 = £438.
• Capacity: 365 × 200 × 14p = £10,220.
• Reactive: above the threshold most of the time, charged at 0.5p/kVArh on perhaps 60,000 kVArh = £300.
• DUoS, TNUoS, BSUoS pass-throughs and TCR fixed bands: roughly £4,000 in aggregate (varies materially by region and TCR band).
• CCL: 350,000 × ~0.78p = £2,730.
• VAT: 20% on the non-CCL non-VAT total. Reclaimable for VAT-registered businesses but a cash-flow issue.

The capacity line is the obvious target: 200 kVA allocation against 130 kVA peak is 35% over-allocated. Renegotiating Available Capacity to 150 kVA (still 15% headroom on peak) saves £2,555 a year on the capacity line alone, and feeds into a lower TCR band at the next reassessment. Power-factor correction sized to the inductive load brings reactive consumption below the threshold and saves the £300 reactive line. Together: roughly £2,800 of annual recurring saving from two interventions, neither of which depends on negotiating the energy unit rate.

That is the level of detail we run on every bill we audit. Where you have a half-hourly site and the bill currently confuses you more than it reassures you, send it through and we will return a written audit inside 48 working hours. The audit is free; the recoverable savings are yours to keep. Start at business energy procurement.