Fixed vs flexible business energy contracts — which one suits your business?

Fixed — the default for SMEs

A fixed contract locks your unit rate and standing charge for the full term (1-5 years). You pay the same p/kWh for every unit you use, regardless of what wholesale markets do. For businesses that need budgeting certainty and don't have in-house energy management, fixed is the default answer.

Flexible — for scale and appetite

Flexible or basket-purchase contracts let you buy your energy volume in tranches against the wholesale market over the contract term. Done well, this can beat a fixed price in stable markets. Done poorly — or in a volatile market — it can go the other way.

Flexible needs an in-house energy manager or a broker/bureau on retainer, plus stakeholder tolerance for month-to-month price variation.

The three-question decision tree

When we advise clients, we ask three questions:

• Is your annual consumption above roughly 400,000 kWh? (Below that, flexible economics rarely stack up.)
• Do you have — or budget for — energy management capacity to make monthly decisions?
• Can your P&L absorb month-to-month variation without renegotiating with finance every time?

Hybrid structures

Some suppliers offer partial-fix / partial-flex contracts — for example fixing 70% of the volume and floating 30%. These can be a sensible bridge if you want partial certainty without full lock-in.

Contract length within a fix

Longer fixed contracts (3-5 years) generally get keener rates than 12-month deals and — crucially — lock in the standing charge, which has been rising structurally. Shorter deals preserve flexibility if you expect a market fall or a change in business circumstances.

Practical guidance

If in doubt, fix. The cost of certainty is usually a small premium versus the cost of being on the wrong side of a wholesale spike. Reserve flexibility for the businesses that have the volume and the team to make it work.