Occurred on July 18, 2017 / Long Beach, California, USA

“Mylar balloons flew and stuck onto the line as my crew was working on power lines. I instructed the two crew members to climb down the pole to be safe in case they caused an explosion from contact. I called to have the line de-energized. Before the line could be de-energized they made a line to ground contact causing an explosion and burning down 2 of the 3 lines.”