wrote

What they are going to find in the end, is that putting some kind of
electric taxi system on the individual aircraft is going to backfire
and cost them seat and cargo capacity that outweighs the supposed saved
fuel costs.

I suspect that the electric taxi concept is to be used in precision taxi
movements, and pushbacks, to avoid jet blast issues. I don't think that
they would plan on doing long distance and/or higher speed taxi movements.
Smaller motors with much gearing could mean a pretty small unit, and wires.
It would mean that they could delay engine start, and also shut down
earlier. The APU will already be running anyway, right?

Unless someone knows more than has been mentioned here, all we are doing is
speculating on the configuration, and use. What results is bound to be a
WAG.

The whole idea of Boeing's new generation of planes, is to use the jet
engines for propulsion; only, and eliminate bleed air being used for a
bazillion other uses, thus stealing thrust and efficiency. It makes great
sense to me. It boggles my mind to see how much bleed air is used to run an
air cycle machines.
--
Jim in NC