The rider veered off Picador Boulevard near Beyer Way and slammed into the electrical box at a high rate of speed shortly before 4 a.m., San Diego police Officer Dan Lasher said. The rider's name was not immediately made public, but he was around 40 years old.
The rider died at the scene shortly after the accident, but the investigation was delayed due to the electrical hazard.
A power outage was affecting 625 San Diego Gas & Electric customers in Otay Mesa, Nestor and San Ysidro, but it was not immediately clear if the accident was the cause. SDG&E estimated electrical service would be restored by 2 p.m.
It was also unclear whether dense morning fog was a factor in the crash.