The data was contained in a report written by Department for Energy and Climate Change (DECC) officials last month, but which was initially left out of the final draft.
But now, pressure group the Renewable Energy Foundation has won a battle for the information to be made public after a request under the Freedom of Information Act.
It shows that the worst-case scenario disclosed to the officials was that the average householder could see power bills rise by 42 per cent between now and 2020, and by a further 10 per cent in the following decade.
However, because of the far greater amounts of energy they use, many businesses could be hit by far higher price rises – of as much as 77 per cent by 2020, and 114 per cent between 2015 and 2030.
Commenting on the data, which is now available on the DECC’s website, John Constable, Renewable Energy Foundation director, said: “"Nobody believes that these policies will actually deliver savings on the levels DECC are claiming.”
But a DECC spokeswoman told the Daily Express bill rises for householders would be “more than offset by energy efficiency savings”.