November 19, 2017

CENTRAL MAINE POWER
Central Maine Power Central Maine Power Completes Aerial Inspections of Transmission Lines

September 12, 2017

Central Maine Power Co. (CMP), a subsidiary of AVANGRID Inc. (NYSE: AGR), has completed its summer inspections of its transmission lines. 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.

Line inspectors on board a helicopter flying over the energy company's transmission system use infrared equipment to look for "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," said Doug Herling, Vice President for Electric Operations at AVANGRID. "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 performs the infrared inspections on a four-year cycle, with about one quarter of the system checked 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.

"Unauthorized uses in our corridors can pose a risk to our energy grid or the environment," said Herling. "We want to be a good neighbor by preventing abuses such as off-road vehicle use or disposal of trash or brush."

About AVANGRID: AVANGRID, Inc. (NYSE: AGR) is a diversified energy and utility company with more than $31 billion in assets and operations in 27 states. The company owns regulated utilities and electricity generation assets through two primary lines of business, Avangrid Networks and Avangrid Renewables. Avangrid Networks is comprised of eight electric and natural gas utilities, serving approximately 3.2 million customers in New York and New England. Avangrid Renewables operates more than 6 gigawatts of owned and controlled renewable generation capacity, primarily through wind and solar, in 22 states across the United States. AVANGRID employs approximately 6,800 people. For more information, visit www.avangrid.com.

About CMP: Central Maine Power Company (CMP) is a subsidiary of AVANGRID, Inc. (NYSE: AGR). As Maine's largest electricity transmission and distribution utility, CMP serves 618,000 homes and businesses, representing about 80% of Maine's customer base. J.D. Power and Associates has ranked the company #1 in customer satisfaction seven times. For more information, visit www.cmpco.com.

Media Contact
Gail Rice
Central Maine Power
gail.rice@avangrid.com
207.622.NEWS (207.622.6397)

For more information

Central Maine Power Company
83 Edison Dr
Augusta Maine
United States 04336
www.cmpco.com


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