The United Kingdom’s biggest airport, Heathrow Airport, is experiencing a significant power outage due to a fire at an electrical substation that supplies the airport’s power and it will be closed until midnight on March 21. The United Kingdom’s biggest airport, Heathrow Airport, is experiencing a significant power outage due to a fire at an electrical substation that supplies the airport’s power and it will be closed until midnight on March 21. Air Transport Industry, Fires Latest business news