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In Zunum’s plane, those motors are powered by the battery packs and the turbogenerator installed near the rear of the fuselage.

The company is developing its own electric motor that will be added to an existing aircraft for test purposes, before later incorporating the turbogenerator.

The plant said the temporary closure of the 1,000-megawatt unit was caused by a malfunction of a turbogenerator protection system at 1952 local time on Saturday.

The plane's computer system calculates ahead of time when the turbogenerator will need to turn on during flight, he said.