Scottish & Southern Energy (SSE) is hiking up gas and electricity prices for its 8.5 million customers from the start of next month.
Its tariffs will rise by an average of 14.2% for electricity and 15.8% for gas from the 1 April.
SSE had been the only one of the UK’s six main suppliers not to hike up prices this year, and had pledged to freeze its energy prices until the end of March.
But it says soaring wholesale gas and electricity costs have forced the increase.
Switch with Which?
Which? runs an impartial energy price comparison site – Switch with Which? – where you can check which supplier offers the best deal for your gas and electricity.
Siobhan Parker of Switch with Which? said: ‘This latest price increase is the green light to switch – everyone’s feeling the post-budget pinch and making sure you’re getting the best deal for your home energy is a smart and easy way to take some of the pressure off.
‘If you haven’t compared your rate with the competition lately, now is the time. We can help you compare prices, switch for free and save money.’
Scottish & Southern’s increases will see dual fuel standard tariffs rise to £1,006 a year.
Users of Switch with Which? are currently enjoying average savings of £200 each year on their energy bills. The figure comes from those who used the site to switch in the 12 months to July 2007.