A fixed tariff means the rate you pay per unit of energy and standard charge don’t change, but the figure you pay per month or quarter can go up if the amount of energy you use increases or isn’t in line with the estimates provided at the time of your switch. However, sometimes providers get their calculations wrong and increase your direct debit incorrectly.
The best way to prevent this is to give your supplier regular meter readings. This’ll help it to keep on top of your usage and then your direct debits may be decreased in the future.
If you feel that your supplier has increased your direct debit payment unfairly, then you can challenge it.
For more on this please take a look at our story which covers this in more detail.