British Gas's new WebSaver 1 tariff is estimated to cost round £1,057 for a medium-usage dual fuel consumer, which would be £240 less than the current average UK energy bill.
As part of the deal, a ten per cent guaranteed saving on the deal would mean that if British Gas's overall tariffs dropped in the spring, then the WebSaver 1 prices would follow suit.
Joe Malinowski, from Theenergyshop.com, told the newspaper: "The guarantee means customers dont have to worry about what happens to their rates when the supplier pulls the deal for new customers not until 2010 anyway."
Harriet Harman, the leader of the House of Commons, recently said the government would consider new legislation which would put energy firms under legal pressure to pass falls in wholesale prices to consumers quicker.
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