BBC News
Thomas Mackintosh
08 May 2025
The root cause of a fire which led to the shutdown of Heathrow Airport and affected hundreds of thousands of journeys worldwide "remains unknown", an interim report says.
Heathrow was closed to all flights for much of 21 March after a fire at a nearby electrical substation, which started the previous night, caused a power outage at the airport.
The National Energy System Operator's (Neso's) final report to the government is due by the end of June, but the grid operator said power was restored to Heathrow's terminals seven hours before flights resumed.
Heathrow Airport said it welcomed the interim findings and that it hoped the final report would provide answers on what caused the fire.
Read on: Heathrow: Cause of outage which shut airport 'remains unknown' - BBC News
