The fire started at Main Street and Heritage Road east of Interstate 805 shortly before noon when a trash truck snagged power lines and pulled them off a power pole, a Chula Vista police spokesman said. The downed lines sparked the fire, which raced up a hill and quickly spread east and north through open grassland.
Ground crews worked along the edges of the fire with wildland fire engines while helicopters ferried water from nearby Lower Otay Lake and doused the flames.
Firefighters had the fire largely contained by 1:30 p.m. and were working to put out hot spots, fire officials said.
No structures were threatened by the blaze.
The downed power lines caused an outage that left about 2,000 homes and businesses, including SeaWorld’s Aquatica water park, without electricity. Aquatica staff told all guests to leave and closed the park for the day shortly after noon, a spokesman said.
San Diego Gas & Electric said they expected electrical service to be fully restored by 6 p.m.