Money saving expert Martin Lewis has warned consumers not to expect "cheaper bills for all," when the Government announces plans to help millions of households today.
He told Daybreak: "What's likely to happen, if we have a reduced number of tariffs, is the people who never switch will pay less and those who regularly switch will pay more."
It is possible that some of the best deals on the market will disappear. We could lurch from a minefield of deals to virtually none at all.
Downing Street sources are adamant tomorrow's energy bills announcement will stick to David Cameron's promise of lower tariffs, but will it?
Ministers are poised to announce plans to decrease energy bills in a bid to get customers on the lowest tariffs available.