Power shortage risks by 2015, Ofgem warns
5 October 2012 Last updated at 13:42 BST
Britain risks running out of energy generating capacity in the winter of 2015-16, according to the energy regulator Ofgem.
Its report predicted that the amount of spare capacity could fall from 14% now to only 4% in three years.
Ofgem's Ian Marlee told BBC News that the report is a "warning light" and reforms of the energy production sector were needed.