- A business gas bill is built from two main parts: a unit rate charged per kilowatt hour (kWh) of gas used, and a fixed daily standing charge applied for every day of the contract.
- There is no domestic-style price cap for business gas. The Ofgem energy price cap applies only to households, so non-domestic rates are set by contract terms, not a regulated ceiling.
- Wholesale gas typically makes up the largest single share of a business unit rate, with the balance covering network charges, supplier costs, environmental levies and margin.
- Ofgem publishes a non-domestic energy market review and microbusiness rules that require clearer contract terms, written contracts and broker disclosure for the smallest business customers.
- The Energy Ombudsman can investigate complaints from microbusinesses about billing, switching and contracts once the supplier has had up to eight weeks to resolve the issue, or issued a deadlock letter.
Business gas prices in 2026 track wholesale markets plus network, levy and supplier costs. There is no price cap for firms, so the contract you sign and the timing of that signing decide what you pay.
Last reviewed: June 2026
What a business gas price is actually made of
When a UK business signs a gas contract, the headline figure that matters most is the unit rate, usually quoted in pence per kilowatt hour (p/kWh). On top of that sits a standing charge, a fixed amount applied for every day of the agreement regardless of how much gas the premises burns. Together these two figures, multiplied by consumption and contract length, produce the bill.
The unit rate is not a single number plucked from the air. It is a stack of separate costs layered on top of one another. The largest layer for most contracts is the wholesale cost of the gas itself, the price the supplier pays to buy energy on the market before selling it on. Around that sit the cost of transporting gas through the national and regional pipe networks, environmental and social levies set by government, the supplier's own operating costs, and a margin. Understanding that stack is the key to understanding why two businesses on the same street can pay very different rates.
Wholesale versus retail: how the two relate
The wholesale price is the cost of gas traded between producers, importers and suppliers on markets such as the UK National Balancing Point. It moves constantly, sometimes by the hour, driven by supply, demand, storage levels and the price of imported liquefied natural gas. The retail price is what a business finally pays, and it is far more stable because it bundles the wholesale element with all the other fixed and slow-moving costs described above.
This is why falling wholesale prices do not always translate into an immediate drop in what a business pays. If a firm has fixed its rate for two or three years, it is locked into the wholesale cost that existed when it signed, plus the other layers. A business on a variable or deemed rate will see movement faster, but even then the non-wholesale costs cushion the change. The relationship is real but it is lagged and diluted, never one to one.
| Wholesale price driver | What it reflects | Typical retail impact |
|---|---|---|
| Cold weather demand | Heating use rises across homes and industry in winter | Pushes new-contract quotes up; fixed deals shield existing customers |
| Gas storage levels | How much reserve gas is available to draw on | Low storage adds risk premium to forward prices |
| LNG import competition | Global demand for shipped liquefied natural gas | Tight global supply raises UK wholesale and quotes |
| Pipeline and supply outages | Disruption to imports or production | Short, sharp spikes that fade as supply returns |
| Forward market sentiment | Traders pricing in expected future conditions | Shapes the cost of longer fixed-term contracts |
Seasonal patterns in business gas pricing
Gas demand in the UK is strongly seasonal. Heating loads are heaviest in the colder months and lighter through summer, and wholesale prices broadly follow that rhythm, tending to be firmer over winter and softer over the warmer period. This seasonality matters for contract timing because the rate a supplier quotes reflects the forward cost of gas across the months the contract covers, not just the price on the day of the quote.
A common assumption is that fixing a contract in summer always secures the cheapest deal because spot prices are lower. In practice the picture is more nuanced. Suppliers price forward, so a summer quote for a two-year contract already bakes in expected winter peaks. What summer can offer is a calmer market with fewer sudden spikes, which sometimes makes for steadier pricing and a wider choice of suppliers competing for business. The genuine lesson is that businesses should watch the trend over weeks and months rather than chasing a single day.
How Ofgem monitors the non-domestic market
Ofgem is the regulator for Great Britain's gas and electricity markets, and while the household price cap grabs most headlines, the regulator also keeps a close eye on the non-domestic sector. There is no equivalent cap for businesses, but Ofgem has introduced and strengthened protections aimed particularly at microbusinesses, the smallest firms that have the least bargaining power and the least time to scrutinise contracts.
These rules cover several areas. Suppliers must provide microbusiness customers with written contracts and clear information about terms, including the principal contract terms in an accessible form. Where a third-party broker is involved, the supplier must ensure the broker's commission or uplift is disclosed, so the business can see what it is paying for that intermediary. Ofgem has also reviewed contract renewal and switching practices, and publishes findings and decisions on the non-domestic market through its market reviews and policy consultations. The aim is transparency rather than a fixed ceiling on price, leaving the actual rate to competition while making the terms easier to understand and challenge.
Contract timing strategy
Because there is no price cap, the contract is the single biggest lever a business controls. The main choice is between a fixed-term contract, which locks the unit rate and standing charge for the agreed period, and a variable or flexible arrangement that tracks the market. A fixed deal removes uncertainty, which can be worth more than chasing the lowest possible rate, especially for a firm that needs predictable budgeting. A variable deal can capture falling prices but exposes the business to spikes.
Timing the renewal also matters because of how the market treats businesses that do nothing. If a fixed contract ends and the business has not arranged a new deal, the supplier usually rolls it onto out-of-contract or deemed rates, which are typically among the most expensive prices available. Avoiding that lapse is often more valuable than fine-tuning the start date. Many suppliers allow a business to agree a new contract some months ahead of the end date, letting the firm lock a rate while it likes the look of the market rather than being forced to accept whatever is on offer the week the old deal expires.
A sensible approach is to know the contract end date well in advance, monitor the broad direction of wholesale prices, gather quotes from more than one supplier, and decide based on the trend and the business's own appetite for risk. Chasing the exact bottom of the market is rarely realistic; avoiding the worst rates and securing certainty usually delivers more value.
What the Energy Ombudsman handles
When a dispute cannot be resolved with the supplier, microbusinesses can escalate to the Energy Ombudsman, a free and independent service. It can look at complaints about billing errors, problems with switching supplier, disputed contract terms, and how a supplier has handled a microbusiness account. A business normally needs to give the supplier the chance to put things right first, and can take the complaint to the Ombudsman once the supplier has had up to eight weeks, or has issued a deadlock letter confirming it can do no more.
If the Ombudsman upholds a complaint, it can require the supplier to correct the account, apologise, explain what happened, and in some cases pay a goodwill amount. Its decisions are binding on the supplier if the business accepts them, but the business is free to reject the outcome and pursue other routes. The service does not set prices and cannot intervene simply because a business feels its rate is too high; its role is to resolve specific complaints about how the supplier has acted.
Frequently Asked Questions
Why do business gas prices change?
The biggest cause is movement in the wholesale cost of gas, which shifts with weather-driven demand, storage levels, import competition and supply disruptions. Network charges, government levies and supplier costs also change over time. Because these costs feed into the rate a supplier quotes, the price offered for a new contract can vary considerably from one period to the next.
What is the Ofgem non-domestic monitoring report?
Ofgem reviews and reports on how the business energy market is working, including contract practices, broker conduct and protections for microbusinesses. These reviews inform rule changes such as requiring written contracts and broker commission disclosure. They are published on the Ofgem website as market reviews, decisions and consultations rather than as a single fixed annual document.
When is the best time to fix a business gas contract?
There is no guaranteed perfect moment, because suppliers price forward and already account for expected seasonal peaks. The more reliable strategy is to know your contract end date, watch the broad trend in wholesale prices over weeks, gather several quotes, and lock a rate when the trend and your budgeting needs align. Avoiding a lapse onto out-of-contract rates usually matters more than timing the exact bottom.
What is a pass-through contract?
A pass-through contract fixes the supplier's unit rate for the wholesale element but allows certain other costs, such as network charges or levies, to be passed through to the business as they change. This differs from a fully fixed deal where all elements are locked. Pass-through can be cheaper at the headline rate but exposes the business to movement in the variable components.
How long can a business gas contract be?
Business gas contracts commonly run from one to around five years, with multi-year fixed terms widely available. Longer terms give more price certainty but reduce flexibility if the market falls. Microbusiness contracts come with extra protections around terms and renewals, so it is worth checking the contract end date and renewal window before committing to a long fixed period.
