Video: This is what happens when Mylar balloons hit power lines…

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Chances are, if you’re going to a celebration, there will be balloons.

A popular choice is the metallic and shiny Mylar balloon sure to be seen at many July 4 cookouts this weekend.

But experts are warning you might want to think twice about using those balloons if you’re outdoors.

The YouTube clip above is evidence why.

Safety experts said the Mylar balloons have a metallic coating and conduct electricity very well.

They can cause power outages and personal injury if mishandled.

Rocky Mountain Power said if the balloons get into power lines they can take out the power to homes, businesses, traffic signals and anything relying on that power.

Officials said the balloons should be secured at all times and never be released to float freely in the air.

If the balloons get into electrical lines, they can spark starting fires as well as power outages.

Safety tips to keep your celebrations safe when using metallic-based balloons:

  • Always attach weights to Mylar balloons and do not remove them
  • When possible, keep metallic balloons indoors
  • Never release Mylar balloons into the air
  • Do not bundle metallic balloons together
  • Never tie a Mylar balloon to the arm of a child
  • If any type of balloon, kite or toy becomes caught in power lines, leave it alone and call Rocky Mountain Power at 1-888-221-7070