Paris Air Show 2013,Airbus A320 Taxiing without engine power or pushback truck

Paris Air Show 2013,Airbus A320 Taxiing without engine power or pushback truck.

Electrical Green Taxiing System , This Airbus A320 is taxiing on electrical power! No engine power needed, Electrical Taxiing system now on an Airbus A320.
Self supporting system for stand alone pushbacks and taxiing.
Safran And Honeywell are cooparating in this project.
Paris Air Show 2013 at Le Bourget, LFPB