Update: April 10, 2015
Lexus reports that a piece of insulator fell from a tower, story here. Lightning probably could cause this to happen, even in a minor T-storm.
Update: April 12, 2015
Visited the area yesterday. Could see the transmission towers in the area, so this happened on one of them. May be near Mechanicsville Road, on a side road.
Smeco also has a solar generating station.