The blaze in March at the North Hyde Substation, which supplies electricity to Heathrow about 1.5 miles away, caused a power outage, which meant Europe’s biggest airport had “no choice but to close” for 16 hours.
More than 1,000 flights to and from Heathrow were cancelled and hundreds of thousands of passengers were affected.
The National Energy System Operator (NESO), in its interim findings into the North Hyde Substation outage, said the London Fire Brigade and National Grid Electricity Transmission were continuing to conduct forensic investigations.
The Metropolitan Police previously confirmed on 25 March that officers had “found no evidence to suggest that the incident was suspicious in nature”.
NESO anticipates that the final report, due to be published in June, is expected to make findings and recommendations relating to the resilience of energy infrastructure in the UK, the response and restoration of energy infrastructure, and the resilience of critical national infrastructure to energy disruption.
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