A recent investigation reveals that Heathrow power outage in March 2025 stemmed from a fire at a nearby substation. According to a government-ordered review, moisture likely seeped into an electrical component, sparking the blaze.
The National Energy System Operator (NESO) confirmed the findings. The fire broke out late on 20 March at North Hyde substation, cutting power to Heathrow Airport. Consequently, the airport shut down the next day, disrupting thousands of flights.
The Heathrow power outage left 66,919 homes and businesses without electricity. Additionally, around 270,000 passengers faced cancellations and delays. Many travelers were stranded overnight as airlines scrambled to adjust schedules.
Images from the scene showed crowded terminals with frustrated passengers waiting for updates. Some slept on floors while others desperately sought alternative routes.
Investigators determined that moisture entered a critical electrical part called a bushing. This caused a short circuit, leading to sparks. When these sparks mixed with oil, heat, and air, flames erupted.
NESO emphasized that such incidents are rare but can have severe consequences. The report urges improved safeguards to prevent future Heathrow power outage emergencies.
Industry experts warn that aging electrical systems need upgrades. They argue that climate change increases risks of moisture-related failures. Heathrow Airport has since reviewed its contingency plans. A spokesperson stated, “We are working with energy providers to enhance reliability.”
Meanwhile, affected passengers continue seeking compensation. Consumer rights groups advise checking eligibility for refunds under EU passenger regulations.
As travel demand rebounds, ensuring stable power remains critical. The Heathrow power outage serves as a stark reminder of infrastructure vulnerabilities.
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