Energy Secretary Ed Miliband has ordered the National Energy System Operator to "urgently investigate" the power outage caused by a substation fire that shut Heathrow Airport on Friday.He is working with Ofgem and using powers under the Energy Act to formally launch the grid operator's investigation.Meanwhile, an internal review of the airport's crisis management plans and its response to the power outage will be undertaken by former transport secretary Ruth Kelly, who is an independent member o

Energy Secretary Ed Miliband has ordered the National Energy System Operator to "urgently investigate" the power outage caused by a substation fire that shut Heathrow Airport on Friday.He is working with Ofgem and using powers under the Energy Act to formally launch the grid operator's investigation.Meanwhile, an internal review of the airport's crisis management plans and its response to the power outage will be undertaken by former transport secretary Ruth Kelly, who is an independent member of Heathrow's board, Heathrow chairman Lord Paul Deighton said.