The fire that closed Heathrow airport in March was caused by problems at an electricity substation which National Grid first identified seven years ago but failed to fix, an official review has found.
The government-owned National Energy System Operator said in a report released on Wednesday that the fire in March was caused by a “catastrophic failure” at the North Hyde substation in Hayes, west London, after moisture got into the “bushing” equipment, through which current flows in and out of the transformer.
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