How business energy contracts work: terms every owner should understand

A business energy contract is a legally binding agreement between your business and a supplier for a fixed period, at agreed rates, and it works very differently to a household energy agreement, which can typically be switched with much shorter notice and fewer penalties.

Contract length is usually one, two or three years, occasionally longer for large energy users. During this term the unit rate and standing charge are generally fixed, though some contracts allow certain non-commodity costs to be passed through if government levies or network charges change during the period.

The termination notice window is one of the most important and least understood parts of a business energy contract. This is a set period, commonly 30 to 90 days before the contract end date, during which you must formally notify your supplier if you intend to switch or not renew. Miss this window and many contracts renew automatically, sometimes at a significantly higher rate than the market offers.

If you do not give notice in time and your contract simply ends without a new one in place, most suppliers move your account onto a deemed or out-of-contract rate, which is typically far more expensive than any negotiated agreement and has no fixed term, meaning it can be changed by the supplier with short notice.

Some contracts include automatic renewal or rollover clauses that extend the agreement, often at a new higher rate, unless you actively cancel within the notice window. These clauses are legal and common, which is why reading contract terms at the point of signing, not just at renewal, matters.

Early termination, if you want to leave a fixed contract before its end date, usually carries a fee, calculated either as a fixed charge or based on the remaining value of the contract. Some contracts permit early termination without penalty if moving premises, though this varies and should be checked before signing.

Deemed rates apply automatically if a business moves into a new premises and starts using energy before agreeing a contract with a supplier, or if a contract lapses without a renewal in place. These rates are among the most expensive in the market and should be replaced with a negotiated contract as quickly as possible.

Billing arrangements vary between suppliers and contract types. Non half-hourly meters are usually billed monthly based on estimated or actual meter readings, while half-hourly meters are billed against actual recorded consumption at thirty-minute intervals, which generally produces more accurate billing but requires the business to understand its own load profile to manage costs effectively.

Contracts for larger businesses sometimes separate the commodity price from non-commodity costs explicitly, known as a pass-through or flexible contract, which allows the business to buy commodity in stages while non-commodity costs are billed as incurred. This structure suits businesses with the resource to manage ongoing market exposure.

Whatever the contract type, the practical discipline that protects a business is the same: record the contract end date and notice window the day the contract is signed, review the market three to six months before that date, and never let a contract lapse without a replacement already agreed.

Working with a comparison service or broker such as Compare Market can help track these dates across multiple meters and contracts, particularly for businesses managing several sites where renewal dates rarely align neatly.

Contract documents for business energy are typically shorter and less consumer-protective than domestic agreements, reflecting the fact that business customers are assumed to have the capacity to read and negotiate terms. This makes it worth actually reading the full terms and conditions, not just the headline rate summary, particularly the clauses covering price review, force majeure and what happens if either party wants to end the agreement early.

Some suppliers issue a Letter of Authority request as part of onboarding a new business customer, which allows them, or a broker acting for you, to obtain your consumption history and current contract details directly from your outgoing supplier. Signing this promptly is often the single fastest way to speed up a switch, since it removes the need for the business itself to chase down historic billing data.

Whichever contract structure you sign, mark the end date and notice window in your diary the same day, since these two dates, not the length of the term itself, are what actually determine how much genuine choice you retain when the agreement comes up for renewal.

Whether a given contract term was a good decision only becomes clear once you compare it against what the market would have offered instead, using your actual consumption rather than a hypothetical. Running that comparison against fresh electricity and gas quotes at renewal is the only honest way to judge it.

Gas transportation charges, like electricity distribution charges, are set regionally and passed straight through by the supplier rather than negotiated, so part of any variation you see between two otherwise similar contract offers in different parts of the country simply reflects where the meter physically sits.