Hayes substation fire

On the evening of 20 March 2025, a fire began at an electrical substation in Hayes, Hillingdon, London, leading to the closure of Heathrow Airport. The fire cut electricity supply to the airport which was not able to be managed by back-up systems and that led to more than 1,000 flights to and from the airport being cancelled and disrupted travel for around 200,000 passengers.

Airports are, typically, protected by an uninterruptible power supply (UPS). The site has been hit by thunderstorms before. The local substations were operated by SEB.

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