They were a part of an outage that originally left 140,000 Valley customers without electricity, following a fire and explosions at a DWP power plant in Northridge.
Shortly after the blaze broke out, crews found a huge container of mineral oil that is used to cool electrical equipment on fire, Fire Department spokesman Brian Humphrey said. The outage came from an explosion at the Northridge/Reseda receiving station, according to the DWP.
The power was purposefully cut to allow firefighters to safely work heavy flames at a plant at 18900 Parthenia St., the DWP reported. They did not want to cause more damage by putting water on the flames while the plant was energized.
Much of the blaze on Saturday was out within two hours but firefighters were expected to stay at the scene to monitor possible flare-ups.
"High voltage electricity comes into stations like these and is then distributed at lower voltages to customers in the surrounding area", the LADWP said in a statement.
The explosion caused a fire that lasted several hours, cutting out power to customers across the north side of the San Fernando Valley. The affected areas were in Northridge, Reseda, Lake Balboa, Tarzana, Granada Hills, Chatsworth, West Hills and Canoga Park.
Southern California residents took to social media to discuss the fire, the power outage and the heat.