Posted on: June 22, 2017

National Grid Transmission System Helicopter Patrols

WALTHAM, MASS. – From lighting homes to energizing major factories, the region’s electric
transmission system powers our economy and virtually all aspects of daily life.
National Grid owns and operates approximately 3,000 miles of electric transmission lines in
Massachusetts, Rhode Island, New Hampshire and Vermont, and works hard to maintain the
reliability of this system that serves National Grid’s 1.7 million New England electric customers, plus
more than 60 other interconnected electric utilities and power producers.
Over the next several weeks, National Grid will conduct helicopter patrols of its entire New
England transmission network to identify any potential problems so they can be addressed by
National Grid transmission line crews before they impact service for customers. These aerial patrols,
conducted semi-annually, complement ground-level inspections by quickly and efficiently covering
large swaths of the transmission system, especially across rugged and isolated terrain.
“Customers depend on the transmission system 24/7 to connect them to the power they
need, so we take great care to keep the system operating safely and reliably, said Fred Raymond,
National Grid vice president, Electric Project Management and Complex Construction. “The
helicopter patrols are an important component of our overall inspection and maintenance program
because they give us a birds-eye view of the system.”
Two types of helicopter inspections are conducted.
  • Infrared inspections detect any excess heat emanating from electrical connectors and
components that may indicate wear, corrosion, or fatigue. 
  • Visual inspections are also performed by experienced personnel using high-power
gyroscopic binoculars to pinpoint any signs of wear on power lines and lightning protection devices;
damaged or leaning transmission structures; loose or broken guy wires; broken, chipped or cracked
insulator equipment; and trees leaning toward the lines or into the transmission corridors.
The inspectors also look for signs of waste disposal or unauthorized construction on
transmission corridors. These could alter the clearance between the ground and the power lines and
might lead to human contact with the lines that could result in severe injuries, or vegetation
interference that could lead to power outages. Inspectors will also look for signs of ground erosion,
which may cause the transmission structures to become unstable.
National Grid notifies all appropriate local, state and federal agencies such as the
Department of Homeland Security, and state and local police that the patrols will be taking place.
Flight schedules and routes may be changed on short notice due to regional weather conditions.
For more information, please visit our website: www.nationalgridus.com, or our Connecting website.
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