CMP Conducts Aerial Inspections of Transmission Lines

CMP News

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

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Release: Immediate  


August 18, 2015


CMP Conducts Aerial Inspections of Transmission Lines

Warns against unauthorized access to rights-of-ways


AUGUSTA, Maine Central Maine Power Co., a subsidiary of Iberdrola USA, began its summer inspections of its transmission lines earlier this month. The annual inspection flights are an important part of the utility's efforts to ensure safe, reliable delivery of power to homes and businesses throughout its service area.
The utility inspects its transmission system using a helicopter equipped with infrared 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 CMP spokesperson Gail 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 (about the same distance between Portland, Maine and Portland, Oregon) and inspects the system annually. The utility also does aerial patrols following severe storms or when its Energy Control Center detects an abnormality such as a momentary outage from a lightning strike or a change in voltage.
Each spring and fall, CMP also does a visual inspection of all of its transmission rights-of-way from the air. These flights help 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 Rice. "We also have had problems with people using our rights-of-way for all-terrain truck mud runs and to dispose of old appliances, building materials, and even cars. This unauthorized use is illegal, bad for the environment, and unfair to nearby homeowners who should be able to enjoy some peace and quiet around their homes."



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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