Fixed versus variable energy tariffs

What a fixed tariff can and cannot fix

A fixed tariff usually fixes the unit rates for a stated term, but it does not fix the amount of energy you use. Standing charges, payment method, discounts, exit fees and eligibility still need checking on the actual offer.

What a variable tariff means

A variable tariff can change under its terms and the relevant pricing framework. The price cap is a framework for eligible standard variable tariffs, not a promise of one annual bill, and it does not apply to every tariff type.

Use scenarios without predicting the market

Enter the rates, standing charges and usage you actually know. You can test a variable scenario by changing one input, but the result is only an illustration for that assumption; it is not a forecast of a future price period.

Decision checklist

Before choosing, write down: the term; unit rates; standing charges; usage period; payment method; exit fee; quote expiry; what happens when the term ends; and any account issue still unresolved. Then compare the complete cost and the uncertainty you are willing to accept.

When not to switch yet

If a bill, reading, balance or complaint is unresolved, switching may make the account history harder to follow. Keep the evidence and ask the supplier to explain the current account before treating a new tariff as the solution.

Common questions