Government outlines plans to limit energy tariffs
20 November 2012 Last updated at 20:38 GMT
Energy companies will be forced by the government to offer a smaller number of tariffs for gas and electricity - to make the system less confusing.
However, consumer groups are warning that some people could end up paying more.
Labour has accused the Prime Minister of breaking his promise to get everyone onto the cheapest tariff.
The BBC's Industry Correspondent, John Moylan, reports.