Customers who have yet to switch energy deals still have time to compare energy prices online, although some fixed rate tariffs could be withdrawn at any time.
According to the Telegraph, the new fixed rate offering from ScottishPower is the cheapest available for the time being, although other energy suppliers have lower cost deals that do not freeze prices.
ScottishPower's Online Fixed Saver December 2012 costs an average of £1,020 a year, which is less than most standard energy deals from other suppliers, the newspaper stated.
Customers on the plan who decide to move to a different tariff or provider will face having to pay redemption penalties.
However, E.ON and npower both offer cheaper tariffs that are not fixed, even though both companies have recently announced price hikes.
Meanwhile, industry regulator Ofgem has brought in a team of forensic accountants to determine how the Big Six calculate their profits.
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