To ask the Secretary of State for Energy and Climate Change what recent estimate he has made of the UK's electricity supply capacity margin; and if he will make a statement. (266724)

The UK's electricity supply capacity margin can be calculated as the difference between the UK's electricity supply capacity available to the transmission network and the UK's peak demand. 2007 is the latest year for which data are available. 2008 data will be available on 30 July 2009. In 2007, the UK's capacity available to the transmission network was 75,190 MW, while the peak demand met was 61,527 MW. This indicates a margin of 13,663 MW, approximately 22.2 per cent. of demand.