Guy Tannenbaum explains how the foil balloons — you can typically find them at any grocery store — are conductive. That means they will form an electric pathway and cause explosions if they hit a power line.

Following a power outage caused by a Mylar balloon last week, NV Energy conducted a special demonstration to highlight the dangers these balloons pose when they contact power lines.The demonstration took place Wednesday at one of NV Energy's training yards in North Las Vegas.