The first race of the inaugural MotoE season in Jerez has been cancelled after a serious fire during a test event at the Spanish circuit.
No-one was injured but the paddock fire destroyed the "majority of material" for the new all-electric season.
The fire started on Wednesday after the first of three test days.
The rest of the test has been cancelled and organisers said a revised calendar will be announced with the opening race at Jerez in May cancelled.
An investigation is under way to determine the cause of the fire which occurred at the newly built 'E-paddock'.
The new event is MotoGP's equivalent of Formula E, featuring electric motorcycles, powered by renewable energy.
"This ambition to evolve and experiment with new technologies brings with it an associated risk," the organisers' statement said.
"It can be confirmed, however, that no motorcycles were charging at the time of the incident in the box in which the fire started.
"Dorna Sports and all of our partners in this new venture are committed to getting the FIM Enel MotoE World Cup back on track as soon as possible, with work already under way to begin rebuilding and replacing materials and motorcycles lost in the fire."
The MotoE season was due to begin at Jerez in May during the MotoGP race weekend, from 3-5 May.
Further races are scheduled for France, Germany, Austria and San Marino.