Business Energy Bills in 2026 Explained: Every Charge and What It Means

Business energy bills are one of the highest recurring costs your business will pay. It is also one of the least understood documents in most finance teams’ inboxes.

That’s because business energy bills are far more complicated than a simple calculation of usage times price.

Business energy bills are partly made up of regulated charges set by third parties, such as NESO, Ofgem, HMRC and the government, collected by your supplier on their behalf.

In 2026, those charges make up, on average, over 60% of your total bill.

This guide explains every one of them: what it is, who sets it, what it funds, and whether it can change during your contract.

The fundamental split: commodity vs non-commodity

Business energy bills are all divided into two types of costs. Understanding this split is the starting point for understanding everything else.

Commodity costs

This is the wholesale cost of the electricity your site actually uses, plus your supplier’s margin, and typically makes up to 40% of your energy bill. It is the element you negotiate when you fix a contract. When a supplier quotes you a unit rate, this is broadly what they are pricing. It is also the element your fixed contract locks in, protecting you from wholesale market movements for the duration of the agreement.

Non-commodity costs

This is the part of business energy bills that most finance directors and energy managers understand the least. Non-commodity charges are set by third parties and make up, on average,
over 60% of your bill. Your supplier simply passes these charges through.

Your supplier doesn’t keep this money or control these rates. When non- commodity charges rise, the increase comes from the third party.

Even within a fixed-price contract, most non-commodity charges remain variable. They can, and do, change.

If your contract contains pass-through terms for network and policy charges, your standing charge and certain bill components can move mid-contract. This is why comparing unit rate alone misses the full picture.

The three main network charges of business energy bills

Network charges recover the cost of the physical infrastructure that delivers electricity from generators to your site. There are three distinct layers, each set by a different body.

TNUoS: Transmission Network Use of System

TNUoS recovers the cost of the high-voltage national transmission network, including pylons, offshore cables, and substations that carry electricity across the country. It is set by NESO (National Energy System Operator) and reviewed each January for the following April.

Since the Targeted Charging Review (TCR) came into effect in April 2023, the residual element of TNUoS, the largest component, is recovered through a fixed capacity-based charge. This means it appears as a standing charge on business energy bills and cannot be avoided by reducing consumption.

From April 2026, TNUoS charges increased by an average of 62% following the start of the RIIO-ET3 regulatory period. For many manufacturing businesses, this added potentially tens of thousands of pounds to their annual bill.

For a full breakdown of how TNUoS is calculated and what changed in 2026, read our detailed guide: TNUoS Charges 2026: Why Your Business Electricity Bill Increased in April.

DUoS: Distribution Use of System

DUoS recovers the cost of the local distribution network, the lower-voltage infrastructure that gets electricity from the transmission system to your site. It is set by your regional Distribution Network Operator (DNO) and reviewed annually.

Unlike TNUoS, DUoS contains a time-of-use element for half-hourly metered sites. Charges are split into red, amber, and green bands, with red band periods carrying the highest rates.

So for your business energy bills, this means that it’s when you consume electricity that matters, not just how much. For sites with flexible operations, actively shifting demand away from red band periods can deliver a measurable reduction in DUoS costs.

BSUoS: Balancing Services Use of System

BSUoS recovers the cost of balancing electricity supply and demand across the grid in real time. Grid operators must constantly match generation to consumption and BSUoS funds those actions. It is set by NESO and charged volumetrically, meaning it scales with the electricity you consume.

BSUoS makes up about 5–6% of the total of business energy bills, but is volatile. It moves with the cost of balancing actions taken on any given day, and can fluctuate significantly in periods of grid stress or high renewable variability. Unlike TNUoS and DUoS, it can shift materially within a contract period.

Download the free Tritility ‘How an Energy Bill is Made Up ’ guide for a printable version of every charge explained.

The five policy levies

On top of network charges, business energy bills include five government and regulatory policy levies. These fund energy policy objectives, from decarbonisation to energy security, and are largely unavoidable for most businesses.

CCL: Climate Change Levy

CCL is a government environmental tax charged per kWh of electricity consumed. It applies to most business electricity use.

Businesses that have entered into a Climate Change Agreement (CCA) with the Environment Agency may qualify for a reduced rate, which is currently a 92% discount on the standard rate for electricity, in exchange for meeting agreed energy efficiency targets.

If your site has energy-intensive processes and has not explored CCA eligibility, it is worth reviewing.

Capacity Market

The Capacity Market funds payments made to generators and demand response providers who commit to having generation or flexible demand capacity available during periods of system stress.

Capacity Market costs have varied considerably in recent years, with auction clearing prices fluctuating significantly depending on how much capacity enters each auction relative to the target. The component on your bill can move materially from year to year and is worth monitoring as part of any full bill review. For more information on how this affects business energy bills, read ‘Half Hourly Meters: Understanding Capacity Charges’.

CfD: Contracts for Difference

CfD funds the difference between the market price of electricity and the agreed ‘strike price’ guaranteed to low-carbon generators such as offshore wind and solar.

When wholesale prices are high, CfD is a net receipt, meaning it reduces business energy bills, because generators pay back into the fund. When wholesale prices are low, it becomes a levy that increases bills.

This bidirectional nature means the CfD element can move in either direction depending on market conditions, and is one of the more variable policy costs from year to year.

Nuclear RAB Levy

The Nuclear Regulated Asset Base (RAB) levy is a relatively new charge, which began appearing on business energy bills from November 2025. It funds the regulated asset base financing model for new nuclear projects, beginning with Sizewell C.

It is a relatively small component of the bill at present, but is expected to grow as the nuclear construction programme progresses and costs increase over the coming decade.

Renewables Obligation (RO)

The Renewables Obligation subsidised older renewable energy projects through a system of tradable certificates. It is now in a managed close-out phase, no new generating capacity is being added under the scheme, but existing projects continue to be subsidised until their certificates expire.

The RO therefore remains present on business energy bills and is declining gradually over time as projects reach the end of their obligation periods.

Your standing charge: not what it looks like

Many businesses treat the standing charge as a simple daily supplier fee. In 2026, this misreading is expensive.

Your standing charge is not a single cost. It is a collection point. The dominant component in most business standing charges in 2026 is the TNUoS residual element, which increased by an average of 62% in April 2026. A typical business standing charge also contains a small supplier margin, elements of DUoS, and in some contract structures, portions of policy levies.

When your standing charge increased sharply in April 2026, it was not your supplier raising their margin. It was the NESO TNUoS tariff applying to your site under your contract’s pass-through terms.

This distinction matters for two reasons: first, it tells you who is responsible for the increase and whether any action is available to you; second, it confirms that the increase is not negotiable with your supplier in the usual sense.

What this means for how you manage energy costs

Understanding the structure of business energy bills is not just useful background knowledge. It directly affects the decisions you can make on energy management.

If your agreed supply capacity exceeds what your site operationally requires, you are paying an inflated TNUoS standing charge. A capacity reduction request to your DNO, where your demand profile supports it, can remove that excess cost structurally.

If your site is half-hourly metered, your DUoS costs depend on when you consume electricity. Shifting flexible load away from red band periods can reduce this element of your bill without changing your total energy use.

And if you are comparing energy quotes purely on unit rate, you are evaluating less than half of your actual cost. A full picture requires comparing non- commodity pass-through terms, capacity band assumptions, and standing charge structures across suppliers, not just the p/kWh headline.

A full review of your business energy bills

If you have received an unexplained increase to your standing charge or want a line-by-line review of your business energy bill, our invoice audit service identifies recoverable errors and unjustified charges. Book a free invoice audit with Tritility or contact our team for further information.