Shadow Welsh Secretary Owen Smith has sharply criticised the decision by SSE to increase energy prices.
Families in Wales are being particularly hard hit by this increase.
Wales – where there are more than one million SSE customers - already suffers from the highest energy bills and lowest levels of disposable income of anywhere in Britain.
This is nothing more than an act of gross profiteering. People in Wales are clearly being ripped off by this energy company and it needs to stop.
People are already suffering under David Cameron's cost of living crisis and now, thanks to his failure to stand up to the big energy companies, consumers will be hit by ever high bills, with SSE increasing prices by nearly 10%. This is a sign that David Cameron only stands up for the privileged few.
If ever there was proof that Ed Miliband was right and we need a freeze on energy prices, this is it.
Labour Leader, Ed Milliband, has taken to Twitter to criticise the announcement that SSE, which owns energy supplier SWALEC, will increase its prices by 8.2% from next month.
Today’s energy price rise hitting especially hard in Wales where SSE has more than one million customers http://t.co/XMMU9Om6Be
– Debbie Laughton on Twitter
With so many households already in fuel poverty, how can they justify more prise rises? People just cant afford to pay anymore!
– Victoria Robb on Facebook
It's the old I feel sorry for as how many become seriously ill over the winter as they cant afford turn the heating on as gas suppliers keep putting prices up.
– Jayne O'Connell on Facebook
I was expecting a rise, after all the cold weather is here, so it hasn't come as a surprise at all.
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Utility giant SSE, which owns Welsh energy supplier SWALEC, has announced prices will rise by 8.2 per cent from 15 November.
SSE has around 600,000 electric customers, and 400,000 gas customers in Wales.
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Energy company SSE said household electricity and gas tariffs are to increase by an average of 8.2% from November 15.
As SSE tell us how deeply they regret the price rise - let's note that they make 5% profit, which is higher than retail giant Tesco.
Also let's reflect on the fact that bills are going up more than 8% while wholesale prices are only up around 4%.
SSE's new average dual fuel bill will now be £1,465 - it's the level where we know people become so squeezed that they turn heating down....or off.
Will Morris, SSE retail managing director, said the firm was "sorry" to have to raise its prices:
We're sorry we have to do this.
We've done as much as we could to keep prices down, but the reality is that buying wholesale energy in global markets, delivering it to customers' homes, and government-imposed levies collected through bills - endorsed by all the major parties - all cost more than they did last year. Eighty five per cent of a typical energy bill is made up of costs outside our direct control and these costs have increased.
So far this year we have made a loss from supplying energy as a result of the higher costs we have been facing and continue to face. We understand and regret that this will add to the pressures on household budgets, but there's a lot we can do to help.
Rising unit prices do not have to mean rising bills and there remains huge potential for customers to save money by improving further their energy efficiency.
Energy giant SSE trades as Southern Electric, Scottish Hydro, and SWALEC which has around a million domestic accounts in Wales.
Its electricity and gas prices will rise by an average of 8.2 per cent from November 15, which the company says equates to an average of £2 per week for a typical dual fuel customer.
The price hike is three times the rate of inflation.
It blamed the increased cost of buying and delivering wholesale energy as well as government levies collected through bills.
It is the first of the major suppliers to announce a rise this autumn.
SSE prices last rose in October 2012 - by an average of 9 per cent.