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Edison said downed wires were reported in some areas and power was expected to be restored sometime Tuesday morning.
"Metallic balloons look harmless, but there's no way to overstate how dangerous they can be when released outside," Paul Jeske, SoCal Edison's director of corporate health and safety, said in a statement quoted by the Los Angeles Times.
The utility released a warning prior to Valentine's Day asking customers to avoid releasing the balloons outdoors or tying them to a person's wrist, as that poses an electrocution risk.
SoCal Edison also asked vendors to attach weights to Mylar balloons to keep them from floating away.