CMP Conducting Aerial Inspections of Transmission Lines

CMP News

Central Maine Power Company, 83 Edison Drive, Augusta, ME 04336 (207) 622-NEWS 

Corporate Communications - 



Release: Immediate  

October 7, 2015


CMP Conducting Aerial Inspections of Transmission Lines


AUGUSTA, Maine Central Maine Power Company (CMP), a subsidiary of Iberdrola USA, has begun its fall inspections of its transmission lines by helicopter. The flights are an important part of the utility's inspection program to ensure safe, reliable delivery of power to homes and businesses throughout its service area.


Each spring and fall, CMP does a visual inspection of all of its transmission rights-of-way from the air. These flights help to spot potential problems with equipment, as well as signs of unauthorized use.


"When people encroach on our rights-of-ways with heavy equipment during logging and other operations, it poses a threat to both system reliability and public safety, says CMP spokesperson Gail Rice. We also have had problems with people using our rights-of-way to dispose of old appliances, building materials, and cars, and even for ATV mud runs. This unauthorized use is bad for the environment, and unfair to people who live nearby who should be able to enjoy some peace and quiet around their homes.


In addition to the spring and fall visual inspections, CMP also flies over its entire transmission system in the summer using a helicopter equipped with infrared thermal imaging equipment to detect hot spots that might need attention.


"Our lines are exposed to the weather all the time, and extreme temperatures and precipitation can take their toll on switches, clamps, insulators, and other equipment, says Rice. These devices often heat up if there's been minor damage or wear, so inspecting the lines with infrared equipment lets us find and fix problems before they cause a power outage."


CMP owns nearly 2,500 miles of transmission line. Along with completing the semi-annual visual patrols and the yearly infrared inspections, the utility does aerial checks when its Dispatch Center detects an abnormality such as a momentary outage from a lightning strike or a change in voltage.


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Media Contact:

Gail Rice




About Central Maine Power Company (CMP): Central Maine Power Company, a subsidiary of Iberdrola USA, is Maine's largest electricity transmission and distribution utility. The company delivers about 9 billion kilowatt hours of electricity annually to more than 600,000 homes and businesses, representing about 80% of Maine's annual consumer sales of electricity. J.D. Power and Associates has ranked the company #1 in customer satisfaction seven times. For more information, visit

About Iberdrola USA: Iberdrola USA is the U.S. subsidiary of global energy leader Iberdrola, S.A. The Iberdrola USA companies employ about 5,000 people with operations in 24 states from New England to the West Coast, providing electricity generation, transmission and distribution, natural gas storage and distribution, and energy services. For more information, please visit our website: Follow us on Twitter: @IberdrolaUSA