Is a fixed business energy tariff always cheaper than variable?

Not necessarily. A fixed tariff offers cost certainty but the rate is based on market conditions at the point of signing, so it may end up higher or lower than a variable tariff would have averaged over the same period, depending on how the wholesale market moves.

Can I fix my rate again before my current fixed contract ends?

Some suppliers allow early renewal or re-fixing ahead of the contract end date, particularly if market conditions suggest rates may rise. This should be discussed directly with the supplier and compared against waiting for the natural renewal point.

What happens if I want to leave a fixed contract early?

Leaving before the term ends usually triggers an early termination charge, calculated based on the remaining contract value. This should be weighed carefully against any potential savings from switching to a lower rate elsewhere.

Which businesses benefit most from fixing?

Businesses that value predictable costs for budgeting, particularly those with tight margins or limited resource to actively manage energy procurement, tend to benefit most from fixed tariffs compared with variable alternatives.

Fixed Business Energy Tariffs

A fixed business energy tariff locks the unit rate, and often the standing charge, for the length of the agreed contract term, meaning the price paid per kWh does not change even if wholesale market prices move during that period. This gives budget certainty that many businesses value for financial planning.

Fixed tariffs are the most common choice for small and medium businesses because they remove the need to monitor wholesale market movements. However, the rate is set based on market expectations at the point of signing, meaning a business locked into a fixed rate does not benefit if prices later fall.

Fixed tariffs lock the unit rate for the agreed contract term

Budget certainty is the main benefit for financial planning

The rate reflects market conditions and supplier margin at the point of signing

No benefit is gained if wholesale prices fall after signing

Common terms range from 1 to 5 years

How a fixed tariff is priced

When a supplier quotes a fixed rate, it typically buys the underlying energy in advance on the wholesale market to cover the contract term, locking in its own costs and adding a margin. This is why fixed rates can vary noticeably depending on when a business requests a quote, since wholesale prices move daily.

Benefits of fixing

Predictable energy costs for budgeting and forecasting
Protection against wholesale price rises during the term
Simpler to manage than actively monitoring a variable rate
Useful for businesses with tight margins sensitive to cost swings

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Risks of fixing

The main risk of a fixed tariff is opportunity cost: if wholesale prices fall significantly after the contract is signed, the business continues paying the higher fixed rate until the term ends. Exiting early to access a lower rate elsewhere usually triggers an early termination charge, which can outweigh any potential saving.

Choosing a fixed contract length

Term	Consideration
1 year	More flexibility to react to market changes at renewal
2 to 3 years	Balances certainty with reasonable flexibility
4 to 5 years	Maximum budget certainty, least flexibility

Fixed contract length considerations

Fixed Business Energy: frequently asked questions

Related business energy pages

Variable Business EnergyA guide to variable business energy tariffs and when this pricing structure suits a business.Business Energy TariffsA guide to the main types of business electricity and gas tariffs available in the UK market.Business Energy ContractsAn explanation of how business energy contracts are structured, agreed and terminated.Business Energy RenewalA guide to how business energy contract renewal works, notice periods and the renew-versus-switch decision.