UK storm: 'Severe damage to parts of network'
25 December 2013 Last updated at 15:00 GMT
Engineers are working to restore energy supplies to thousands of homes, mostly in the south of England, following floods and power cuts caused by severe weather.
Tim Field from the Energy Networks Association said repairs were being hampered by flooded and blocked roads - and there was "severe damage to parts of the network."
He thanked people for their patience, but warned it was likely many would be without power until at least Boxing Day.