Managing the Three Ts of Electric Transmission with GIS
Where were you on August 14, 2003, at 4:00 p.m. (Eastern time)? That’s when much of the northeastern United States was blacked out. No power. Sweaty office workers stuck in elevators from Manhattan to Cleveland. Traffic signals dead everywhere. Tons of food spoiled. At the time, people were still wary from the September 11 attacks.
The culprit for disaster this time? Well, there were many. But two of them were rather skinny Ailanthus trees that had become a little too big for their britches.
The trees grew too close to the heavily loaded Stuart-Atlanta 345 kV transmission line, a major power corridor between the United States and Canada. When transmission lines carry a lot of power, their conductors sag. As fate would have it, at the worst possible time, the sagging lines came in contact with those two little trees. So the line tripped out. This was one in a series of cascading events—which created one of the largest power failures in the nation’s history. Continue reading