>> Why is there no back up power supply for such a large piece of critical
>> infrastructure!?
Reports suggest that there are multiple grid connections to LHR. The area supplied through the Hayes substation is mostly 'old' LHR ie parts of the Central Area. T4 and T5 are said to have supplies.
I think closing the whole thing is a function of when the incident happened ie when only long haul flights were in the air and could be diverted or turned back. Better to have one simple message, it's shut, then the chaos of having it half open with all the mixed messages and potential for misunderstandings involved.
If the central area is without power then, even if there's traction current to the railway, lack of lighting etc on stations would hobble the tubes and buses.
It would be interesting to see what would have happened if the incident had occurred during the morning arrivals peak.
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HEATHROW new
HEATHROW new