The energy price cap will rise by £35 a year from Wednesday for a typical household in England, Scotland and Wales.
The changes come as the weather cools and many people switch on their central heating, putting more pressure on household finances.
Uswitch calculated that the average home on a standard tariff would spend £140 on energy in October compared with £63 in September, thanks to a combination of higher rates and increased usage in autumn.
How will your bills be affected by this increase and why are energy costs going up?
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