'Once in a generation' energy change - Ed Davey
29 November 2012 Last updated at 11:55 GMT
Energy minister Ed Davey has unveiled his much-trailed Energy Bill, setting out the roadmap for the UK's switch to "a low-carbon economy".
Household energy bills could rise by at least £100 by 2020 to help pay for the switch to "clean" energy.
Mr Davey described the bill as a "once in a generation transformation of the energy landscape".