The UK Business Energy Market: How It Works and Who Regulates It

How the UK energy market is structured

The UK energy market is not a single business but a chain of separately licensed activities. Liberalisation under the Electricity Act 1989 and the Gas Act 1986 broke up the old state monopolies and required that the competitive parts of the industry be kept distinct from the parts that remain natural monopolies. For a business buying gas or electricity, understanding this structure explains why one organisation generates the power, another moves it across the country, a third delivers it down your street, and a fourth, your supplier, bills you for it.

The four core functions are generation, transmission, distribution and supply. Each requires a licence, and a single company cannot freely combine them all without meeting strict conditions, because mixing a competitive activity with a monopoly one can distort prices. This separation is the foundation of how the market is meant to keep costs honest.

Generation

Generation is where electricity is produced: gas-fired stations, nuclear plants, offshore and onshore wind, solar farms and a growing fleet of battery storage assets. Generators sell their output into the wholesale market, either through bilateral contracts with suppliers and traders or through power exchanges. The wholesale price they receive moves constantly with demand, fuel costs and the availability of renewable output. Gas reaches the system through the National Transmission System operated by the gas transporter, fed by domestic production, imports and storage.

Transmission

Transmission is the high-voltage backbone that carries electricity across the country at 275kV and 400kV. The National Energy System Operator (NESO), which took over the system operator role from the previous National Grid arrangements, balances supply and demand second by second so that the frequency stays close to 50Hz. Transmission owners maintain the pylons and substations. Because there is only one national grid, transmission is a regulated monopoly: Ofgem sets the revenue these companies can earn through price controls rather than allowing competition to set the price.

Distribution

Distribution takes electricity from the transmission network and steps it down to the lower voltages that reach business premises. This is handled by regional Distribution Network Operators (DNOs), each responsible for a geographic licence area. For gas, equivalent regional Gas Distribution Networks deliver to the meter. Distribution is also a monopoly, so the charges DNOs and gas networks levy, which appear inside your unit rate and standing charge, are controlled by Ofgem under its price control framework. You cannot choose your DNO; it is fixed by your postcode.

Supply

Supply is the competitive, customer-facing end. Licensed suppliers buy energy wholesale, pay the network charges set by transmission and distribution, add costs for metering, policy obligations and their own margin, then sell a single unit rate and standing charge to the business. This is the only part of the chain a business actually chooses. When you switch supplier, the electrons reaching your building do not change; only the company managing the contract and the billing does.

Who regulates the market: Ofgem

Ofgem, the Office of Gas and Electricity Markets, is the independent regulator that governs the whole system. It operates under statutory duties to protect existing and future consumers, with a principal objective of promoting an efficient, competitive market. Ofgem issues the licences that generators, networks and suppliers must hold, and it can modify, enforce or revoke them.

Its core levers are licensing, price controls and enforcement. On the monopoly networks, Ofgem runs price control settlements that decide how much revenue transmission and distribution companies can recover, which directly affects the network element of every business bill. On supply, it sets standards of conduct, billing rules and protections for smaller businesses. Where a supplier breaches its licence, Ofgem can impose penalties or, in serious cases, revoke the licence and trigger the Supplier of Last Resort process to move customers to another supplier.

One point trips up many business owners: Ofgem's headline Energy Price Cap is a domestic measure. It limits standard variable tariffs for households only. It does not cap business energy prices. Business tariffs are negotiated and follow wholesale movements, which is why a sound understanding of the market matters when you sign a fixed contract.

ELEXON and the Balancing and Settlement Code

Electricity cannot be neatly labelled once it enters the grid, so the industry needs a way to work out who put in what and who took out what, then settle the money. That job belongs to the Balancing and Settlement Code (BSC), and ELEXON is the body that administers it.

Every half-hour, the system measures the difference between the volume each supplier contracted to deliver and what its customers actually consumed. ELEXON calculates these imbalances and the associated cash flows so that suppliers who were short pay, and those who were long are paid, at the imbalance price. This settlement process underpins the entire electricity market: without it, there would be no reliable way to reconcile a national pool of shared power. Initial settlement is followed by reconciliation runs as more accurate meter data arrives. For larger business sites on half-hourly metering, accurate consumption data feeds straight into this process, which is part of why half-hourly meters give such granular billing.

How business energy prices are set

A business unit rate is built from several stacked components rather than a single number. The wholesale cost of the energy itself is usually the largest share, and it is volatile. On top sit network charges (transmission and distribution), policy and environmental costs that fund obligations such as renewables support, metering and data costs, the supplier's operating costs and margin, and VAT. The standing charge, a fixed daily amount, mainly covers network and metering costs that apply regardless of how much you use.

Because business contracts are typically fixed for one to five years, the price you lock in reflects what the supplier expects wholesale costs to be across that term, plus a risk premium. Two businesses on the same street can pay very different rates depending on when they signed, their consumption profile, their credit position and whether a broker was involved. There is no universal published business tariff to compare against, which makes the timing of your contract renewal one of the biggest cost levers you control.

How the business market differs from the domestic market

The non-domestic market behaves differently from the household one in several practical ways. Business contracts are fixed-term and, once signed, generally cannot be exited early without charges. Many have a defined switching window before renewal, and missing it can roll you onto expensive out-of-contract or deemed rates. Dual-fuel household-style bundles are less common; gas and electricity are often contracted separately.

Crucially, the protections differ. Households benefit from the Energy Price Cap and broad consumer law. Businesses do not get the cap, and only smaller businesses, principally micro-businesses, get the full set of Ofgem supply-licence protections such as defined contract information and access to the Energy Ombudsman. Larger businesses are treated more as commercial parties expected to negotiate on their own terms, so reading the contract carefully matters more.

Licensed suppliers and consumer protection

Only companies holding a valid supply licence from Ofgem can sell gas or electricity to UK businesses. Licence conditions cover billing accuracy, complaint handling, the information that must be given before a contract is agreed, and rules around brokers and third-party intermediaries. Ofgem has tightened transparency rules so that smaller businesses can see broker commissions and contract terms more clearly. If a licensed supplier fails financially, customers are not cut off: Ofgem appoints a Supplier of Last Resort to take on the contracts, protecting continuity of supply.

Complaint routes for businesses

If a business has a dispute over billing, a switch, back-billing or contract terms, the first step is always the supplier's own complaints process. The supplier must investigate and respond. If the matter is not resolved after eight weeks, or the supplier issues a deadlock letter sooner, eligible businesses can refer the complaint to the Energy Ombudsman, whose decisions bind the supplier but not the customer, and which is free to use.

Eligibility for the Ombudsman is generally limited to micro-businesses and smaller organisations that meet thresholds based on employees, turnover or annual consumption. Larger businesses outside those thresholds typically have to pursue disputes through commercial channels or the courts. For complaints about a broker rather than a supplier, the route can differ, so check whether the broker is covered by a redress scheme. For matters touching how the market itself operates, Ofgem oversees licence compliance, while Citizens Advice provides general consumer support for the smallest businesses.

Frequently Asked Questions

Who regulates business energy in the UK?

Ofgem, the Office of Gas and Electricity Markets, is the independent regulator for the gas and electricity markets in Great Britain. It issues and enforces the licences that generators, network operators and suppliers must hold, runs price controls on the monopoly networks, and sets supply-licence conditions that protect smaller business customers.

What is Ofgem's role?

Ofgem licenses market participants, sets and enforces the rules they must follow, and controls how much revenue the monopoly transmission and distribution networks can earn through price controls. It protects consumers and promotes competition. It does not, however, cap most business energy tariffs; the domestic Energy Price Cap applies only to standard household tariffs.

What is ELEXON?

ELEXON is the body that administers the Balancing and Settlement Code for electricity in Great Britain. It measures how much electricity each supplier put onto or took off the grid in each half-hour period, calculates the imbalances against what they contracted, and settles the resulting payments so the shared national system reconciles financially.

How many licensed business energy suppliers are there?

There is no single fixed figure, as suppliers enter and leave the market and the number changes over time. Several dozen suppliers hold electricity or gas supply licences serving non-domestic customers, ranging from a handful of large established suppliers to many smaller and specialist business-focused providers. The current register of licensees is maintained by Ofgem.

What is the Balancing and Settlement Code?

The Balancing and Settlement Code (BSC) is the industry code that governs the balancing mechanism and the settlement of electricity volumes in Great Britain. It defines how each supplier's contracted volumes are compared with actual metered consumption every half-hour and how the financial imbalances are calculated and settled. ELEXON administers it on behalf of the industry.