Wikipedia
EGTS is an electric taxiing system which allows aircraft to taxi and pushback without requiring the use of aircraft engines, and is designed to reduce fuel volumes used by aircraft and reduce greenhouse gas emissions during ground operations. It was developed by EGTS International, a joint venture between Honeywell Aerospace and Safran. The joint venture was announced at the 2011 Paris Air Show.
EGTS technology was invented in 2003 by Delos Aerospace and since 2007 many electric taxiing systems have been explored based on the pioneering patents of Delos Aerospace. www.Dleos.Aero
EGTS technology enables aircraft to avoid using their main engines during taxiing and instead taxi autonomously under their own electrical power, using the Auxiliary Power Unit (APU) generator. The system is designed for single-aisle aircraft, such as the Airbus A320 and the Boeing 737.