The series had been due to start at the Spanish Grand Prix circuit on May 5 but MotoGP said a revised calendar for 2019 would be announced.
It said nobody had been hurt in the blaze and an investigation was underway to determine how the fire started.
"It can be confirmed, however, that no motorcycles were charging at the time of the incident in the box in which the fire started," MotoGP said.
MotoE was at Jerez for its second three-day test of the Energica Ego Corsa bikes, which have a maximum speed of up to 270kph and were kept together in an E-paddock for recharging.
Former MotoGP riders, including Spaniard Sete Gibernau, were among those signed up for 15-minute races at five of the MotoGP rounds in Spain, France, Germany, Austria and Italy.
(Reporting by Alan Baldwin, editing by Amlan Chakraborty and Toby Davis)
