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Report: National Grid failures caused the fire that shut down Heathrow.

The failure of an electrical substation component that was not properly maintained caused the fire at Heathrow Airport in March, according to Britain's National Energy System Operator.

Ofgem, Britain's energy regulator, said that it had launched a formal enforcement investigation into National Grid Electricity Transmission in response to the findings of the report.

The Heathrow airport closure on March 21, the busiest in Europe, cost airlines tens and millions of pounds. It also left thousands of passengers stranded. The incident also raised concerns about the resilience and stability of Britain's transport infrastructure.

The National Energy System Operator's report stated that "this review has seen evidence of a catastrophic failure in one of the high voltage bushings on the transformer at National Grid Electricity Transmission’s 275kV Substation".

This was probably caused by moisture getting into the bushing and causing an electric fault.

The report stated that National Grid's controls were ineffective and that they failed to recognize that no action was taken regarding an elevated moisture reading for 2018.

Ed Miliband, the Energy Minister, said that the report is "deeply worrying".

National Grid did respond immediately to a comment request. (Reporting and editing by William James)

(source: Reuters)