epa11977859 A passenger arrives at Heathrow Airport in London, Britain, 21 March 2025. The Heathrow Airport on 21 March announced it would be closed all day, following a power outage 'due to a fire at an electrical substation supplying the airport'. EPA/TOLGA AKMEN

epa11977858 Passengers wait at Heathrow Airport in London, Britain, 21 March 2025. The Heathrow Airport on 21 March announced it would be closed all day, following a power outage 'due to a fire at an electrical substation supplying the airport'. EPA/TOLGA AKMEN