In message , Matthew
Malthouse writes

"The Tube will now get all its electricity from the National Grid. But
in the event of National Grid failure, Lots Roads smaller sister
station at Greenwich, equipped with quick start gas turbines, will be
used for emergency power and SPL has installed battery lighting at all
stations to provide emergency lighting."

So did this happen?

If you mean, has the facility been provided at Greenwich, then yes.

If you mean, was it used on Thursday, the answer is no according to the
BBC report the next day ...

A small back up generator at Greenwich which is designed to
power safety lights in trains and stations in the event of a
total power failure, was not needed on Thursday because power
was diverted from other parts of the system.

I don't know if last part is entirely true, as the London Fire Brigade
reported rescuing 100 people from lifts - although that strikes me as a
relatively small number for LU in the rush hour. Possibly just 5 or 6
lifts in all?

--
Paul Terry