Northern Ireland homes have electricity restored 20 January 2013 Last updated at 09:32 Northern Ireland Electricity has said all the homes without power due to the weather are now back to normal. At its peak more than 2,500 homes across Northern Ireland were affected as a result of heavy snow and high winds on Friday. NIE said power was restored to the remaining 150 homes, mainly in County Down, by Saturday night. Its engineers used a helicopter to get to some of the remote areas which had been affected. Meanwhile the Roads Service has warned there is a risk of ice, frost and snow on roads on Sunday morning. Salting operations were undertaken on Saturday night and more had been carried out on Sunday morning. Motorists are advised to exercise caution when travelling, particularly when driving on untreated roads. Aer Lingus has cancelled a number of flights to and from London's Heathrow airport. The 12 flights involve Dublin, Belfast, Shannon and Cork airports.