Caldey Island monks get rebate after overpaying their electricity bills for 10 years.
SSE's Managing Director, who is due to face MPs later today, explains why customers are experiencing a 8.3 percent increase in their bills.
A guide to some of the options open to you as a consumer if you believe you have been mis-sold to by SSE or any other energy company.
Retired engineer Gary Day, who says he saved himself and three neighbours more than £2,300 after discovering their electricity meter clocks were wrong, told Which? magazine: "I have only checked four meters and every single one of them was wrong.
"I am horrified that there might be hundreds of others that have these clock errors and don't realise it."
A retired engineer from South Wales says he has saved himself and three neighbours more than £2,300 after discovering their electricity meter clocks were wrong.
Gary Day said two replacement meters failed and he was wrongly told his clock would automatically adjust to British Summer Time.
His neighbour Andrew Murphy claimed back around £800 after discovering his clock was about three hours out.
Certain tariffs offer customers a lower rate for electricity during some hours and a higher rate for others.
Consumer group Which? is now warning up to 3.9 million households reliant on these tariffs could be paying too much due to the incorrect meter clocks.
Around a million households in Wales will see energy costs rise from today.
The owners of SWALEC, SSE, announced last month an average hike of 8.2 per cent.
It says that equates to two pounds a week for a typical dual fuel customer.
Wholesale prices and environmental, social and delivery costs are said to be to blame.
As energy companies are grilled by MPs about their profits and bonuses as they raise prices once again Rob Shelley has been hearing how one Welsh family is struggling to keep up with winter fuel costs.
North Wales MP Albert Owen asked Ian Peters from British Gas why energy bosses are getting huge bonuses.
The boss of the company which owns the energy firm Swalec has defended his firm's profits saying that without them it wouldn't be able to employ so many people. William Morris was amongst the energy chiefs quizzed by MPs about price rises today.
Bosses from the UK's six largest energy providers will be grilled by MPs today about recent price hikes.
Four of the companies have announced rises to average dual fuel energy bills:
- SSE - up by 8.2 percent for 10 million customer
- British Gas - up by 9.2 percent for 7.8 million customers
- RWE npower - up by 10.4 percent for 3.1 million customers
- ScottishPower - up by 7 percent for 2.2 million customers
Bosses from the "Big Six" energy companies are due to give evidence later today to the Commons Energy and Climate Change Committee where they are expected to be grilled by MPs.
Their appearance follows a statement by the Prime Minister's official spokesman who said it was up to the energy companies to justify their charges to consumers amid the latest round of price rises.