National Grid confirms Heathrow never lost access to power

The chief executive of the National Grid has confirmed power was available to keep Heathrow open during Friday’s shutdown.
In an interview with the Financial Times, John Pettigrew said the fire that knocked out a substation was a “unique event”, but that two other substations remained operational and capable of powering the airport in west London.
Heathrow chief executive Thomas Woldbye had said on Friday that the shutdown was not caused by a lack of power, but was due to the time it took to switch from the damaged substation to the other two.
The airport is under pressure from airlines to explain why flights were suspended for 18 hours after the fire in the early hours of Friday morning.
The fire started in a transformer within the electrical substation in Hayes north of Heathrow around midnight.

Courtesy: BBC