Ofgem opens investigation into National Grid as report finds incident that cut airport power was preventable
The root cause of the substation fire that shut Heathrow airport in March was a preventable technical fault that National Grid had been aware of seven years ago but failed to fix properly, investigators have concluded.
The final report by the National Energy System Operator (Neso) into the incident found said the fire that cut power to the airport, affecting more than 1,350 flights and almost 300,000 passengers, was “most likely” caused by moisture entering the insulation around wires sparking the electrical fault.
