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."
– Extracts from letter to customers - Ian Marchant, SWALEC Chief Executive
Increasing prices is one of the hardest decisions any business has to take, particularly in difficult economic conditions, so I am very sorry that we’ve had to announce an increase from 15th October.
Over the last year the costs we face have increased significantly including the charges for delivering electricity and gas to your home, the cost of environmental and social obligations, and what we have paid for the energy we’ll supply to you this winter.
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.