A Downing Street spokeswoman said they welcomed Ofgem's new proposals to force companies to tell customers about their cheaper tariffs:
We welcome the proposals that Ofgem have set out today. Their proposals will help make bills simpler and easier for consumers. This is complementary with what we are trying to achieve. It is really the same agenda. We have been working with them for some time on this and will continue to work with them. As the Prime Minister said, we will use forthcoming legislation to ensure that people get the lowest tariffs. The Energy Bill will be published in due course and we will take into account the Ofgem proposals.
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.