Eversource schedules its helicopters to fly over major electricity transmission lines and equipment four times a year (most recently in late December, late February and late this month — starting about now or sometime soon). We asked a utility spokesman why that happens so often, and here’s what we found out:
Frank Poirot, a spokesman for Eversource, said the electric utility conducts two different types of regular inspections over major equipment, including transmission lines, each twice a year. Heat-Sensing Flights
Two trips each year are done with infrared, heat-sensing equipment to see whether lines are especially hot — a sign that the equipment is breaking down. The choppers will fly over the equipment once in the winter and once in the summer. “In the winter, we’ll see the greatest temperature differential, so that hot spot will show up right away,” Poirot said.