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Welsh energy supplier SWALEC says its prices for electricity and gas will rise by 9% from 15 October.
In a letter to customers, Chief Executive Ian Marchant says that supply costs "have increased significantly" over the last year, and these pressures have made a price increase "unavoidable."
SWALEC says it will be contacting customers before 15 September to give them more information about the rises, and promises there will be no more price increases before the second half of 2013 at the earliest.
ITV Wales speaks to shoppers in Pontypridd to find out if the cost of fuel is already too high.
It comes as Consumer Focus Wales says more than 70 per cent of people in Wales are worried about the price of energy rising further.
More than 70 per cent of people in Wales are worried about future energy price rises. That is according to the latest research by Consumer Focus Wales.
The report found more people admitted that they are struggling to pay their bills, while a third of those asked say the bills are a bigger worry than they were a few years ago.
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The energy supplier, which has a million accounts in Wales, says cost pressures have made an average price increase of 9% "unavoidable."