Cause of Heathrow shutdown fire remains unknown
Briefly

Investigators have not yet determined the cause of a significant fire at a substation in West London that occurred six weeks ago, affecting nearly 70,000 homes and disrupting Heathrow Airport operations. The National Energy System Operator (Neso) has ruled out suspicious activities and is reviewing the substation's maintenance and design compliance. An interim report has been released, but a comprehensive report is expected by June. The incident prompted inquiries from various regulatory bodies and an internal investigation by Heathrow into its resilience.
After an urgent investigation, the National Energy System Operator ruled out suspicious activity regarding the fire but will continue to assess the substation's compliance.
Heathrow Airport's closure lasted nearly 24 hours due to the fire, which affected over 1,350 flights and left approximately 67,000 homes without electricity.
Ed Miliband stated that the initial summary by the National Energy System Operator has ruled out suspicious activity, pending further investigation to ensure energy resilience.
The incident led to a series of inquiries including an internal assessment by Heathrow to evaluate its infrastructure resilience post-incident.
Read at www.theguardian.com
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