Scottish Power has become the fourth energy supplier to unveil a price rise, as it announced dual fuel bills would go up by 8.6%, adding £113 to annual bills.
The energy giant said it would increase gas prices by 8.5% and electricity prices by 9% from 6 December, which will affect 2.2 million Scottish Power customers.
Customers will shoulder different price increases in varying parts of the country, as people in southern England will get a 10.2% increase while customers in some parts of Scotland will suffer an increase as low as 7.3%.
Scottish Power's increase comes after Npower said it would up prices by 10.4%, SSE announced it would put up prices by 8.2% from 15 November and British Gas would increase theirs from 23 November by 9.2%.
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Scottish Power was previously fined £8.5 million after a mis-selling probe by energy regulator Ofgem.
In response to news of the price increase, Neil Clitheroe, ScottishPower CEO of energy retail and generation, said: “We understand that these are difficult times for many families, and we have done what we can to hold our prices for as long as possible.
"Recently we announced a range of measures to help our most vulnerable customers this winter. We will now write to every customer who will be impacted by the price increase, and we would encourage anyone who is concerned to contact us so we can discuss their options.”