Solar panel gains could be slashed for people who install after 8 December, according to a document accidentally leaked by the Energy Saving Trust (EST).
Consumer groups, including MoneySavingExpert.com, have called on the Government and energy suppliers to finally take decisive action to curb the soaring cost of gas and electricity.
Recent price hikes have increased the profit margins enjoyed by Britain's big energy firms to £125 per customer a year from £15 in June, it emerged today.