On August 20, 2023, a power outage affected Stansted Airport, leading to delays and train cancellations. Passengers were stranded on trains and planes, and the airport railway station was initially evacuated after its fire alarms went off. An airport spokesman said a "power outage" affected the whole site and systems had to be rebooted. Restrictions were put in place on arriving passengers to prevent further overcrowding in the terminal. Passengers took to social media showing crowds of people in the terminal and queues on escalators, while others said they were stuck on trains or on the tarmac in arriving planes.

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