Crews completely contained a 1.5 acre brush fire along State Route 67 at Slaughterhouse Canyon Road in Lakeside.
Heartland Fire & Rescue crews arrived shortly after 12 p.m. Tuesday to find approximately a half of an acre burning.
In less than half an hour, the fire had scorched 1.5 acres, Cal Fire officials said.
The forward rate of spread was significantly slowed.
There are reports of downed utility lines. The San Diego Gas & Electric website said crews were assessing an outage leaving more than 1,000 customers without power.
The communities affected include Blossom Valley/El Monte, Eucalyptus Hills, San Vicente/Foster/Moreno and Barona/El Capitan.
There have been no reports of injuries.
No word on what caused the fire.
No further information is available.