Thousands of businesses and homes are without power in Sorrento Valley and the surrounding areas after power lines fell.
The lines on the 11000 block of Sorrento Valley Rd. were down at about 10 a.m. Friday, according to the San Diego Fire Department.
The outage's suspected cause is a problem in the overhead electrical system.
The fire department estimated that about 1,800 customers were out of power. Customers in Mira Mesa, Scripps Ranch, Torrey Pines, Sorrento Valley and University City were also affected by the outage.
SDG&E, the fire and police departments all responded to the outage.