DETROIT (AP) – Michigan’s Public Service Commission has ordered a utility company to help identify unused power lines in Detroit following the accidental electrocution of a 12-year-old girl.

The commission opened an investigation following the September 2016 death of K’Brianna Griffin. The girl was killed when she came into contact with a downed power line in a friend’s yard. The line was inactive but energized because it was resting on a live DTE Energy power line.

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The commission says DTE Energy will work with Detroit’s Public Lighting department to find unused lines.

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The commission is trying to determine how much abandoned wire remains, who owns the lines and accessibility to the wires. A report is due by March 30.

Detroit Public Lighting estimates at least 600 to 900 miles (966 to 1,448 kilometers) of out-of-service wires are in its service area.

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