The MotoGP World Championship lost a practice session for the second time this season, after FP2 was cancelled at Aragon in Spain on Friday.
Electricity problems at the circuit meant that 125cc afternoon practice was delayed, but did take place. However further power cuts postponed the MotoGP and Moto2 sessions for several hours before the decision was taken to cancel them.
A Dorna statement explained:
"The Gran Premio de Aragón MotoGP and Moto2 FP2 sessions were cancelled today (Friday) due to an electrical shortage.
"This issue was caused by the failure of one of the power transformers at the track, leading to a substantial blackout at the venue. The promoters of the Gran Premio de Aragón did everything possible to fix the issue and allow for the scheduled track activity to go ahead as planned, but ultimately were unable to guarantee the safety standards required of the circuit.
"This situation led to the cancellation of the remaining sessions. Work is currently being carried out in order to solve the issue and ensure that the Grand Prix can resume as normal tomorrow, Saturday September 17th."
Friday marked the second time in 2011 that MotoGP has lost a practice session, with an oil spill forcing FP2 to be written-off at Assen. As in Holland, tomorrow's FP3 will be extended (to 75 minutes) to help compensate for the lost track time.
"The cancellation of a practice session due to a power shortage here at Aragon certainly doesn't look good for a World Championship," said Gresini Honda rider Marco Simoncelli. "The clearly need to look into it and make sure that things are repaired and that it doesn't happen again."
Factory Yamaha rider Ben Spies added: "I'm annoyed about this afternoon, it's no one person's fault but it's frustrating."
The new Motorland Aragon circuit made history by winning the IRTA 'Best Grand Prix' award at its very first attempt in 2010.
Friday's embarrassing problems mean the circuit is unlikely to retain the award. The priority will now be to ensure that such interruptions do not occur during the rest of the weekend.
This morning's first practice session saw Repsol Honda's Dani Pedrosa fastest by 0.449sec from Yamaha's Jorge Lorenzo. Pedrosa's team-mate and world championship leader Casey Stoner was 0.525sec from the top in third.