Two of the Big Six energy suppliers have now warned customers to expect further price hikes this year.
Scottish and Southern Energy (SSE) said wholesale gas costs have witnessed a 25 per cent increase since its last hike in December 2010, which means its cheap gas division has been losing money, the BBC reported.
The energy supplier said: "Forward annual wholesale prices for electricity and gas have risen by around one quarter and around one third respectively in the six months following SSE's 29 October 2010 announcement of a price increase for household gas supply."
It comes after British Gas parent company Centrica issued a warning along similar lines, which could prompt domestic energy users to switch gas and electricity tariffs before prices go up again.
A number of suppliers are planning to withdraw their cheap online energy tariffs before July 1st, so consumers should not wait around to compare energy prices and make the switch.
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