Ofgem is due to announce how Britain's price cap will change in January-March at 7am today, and analysts fear the cap will rise slightly.
It was originally introduced five years ago to protect consumers who did not shop around for their energy, but once prices rose it became the default tariff.
The current cap, which runs from October to December, works out at 1,717 per year for an average household's dual-fuel bill.
Craig Lowrey, principal consultant at Cornwall Insight, said: Supply concerns have kept the market as volatile as earlier in the year and additional charges have remained relatively stable.
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