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CMP upgrades at South Gorham Substation will enhance service in southern Maine

AUGUSTA, Maine, June 16, 2009 — Central Maine Power Company (CMP) has begun work on a substation expansion that should enhance the stability and reliability of the utility’s delivery system serving Greater Portland and points to the south. The utility is expanding its South Gorham Substation by adding a second autotransformer and other equipment to make the electric grid in southern Maine more stable and reliable.


The autotransformer, which has a shipping weight of more than 270 tons, will be transported by rail to Westbrook and trucked to the substation site off Straw Road in South Gorham later this summer.

“Our South Gorham Substation is the main source of electricity for the Greater Portland area, and is one of six critical hubs in our system,” says CMP spokesman John Carroll. “While the substation and transmission lines that come from it have served the area well for many years, they have begun to reach their capacity. CMP needs to expand the system and create some redundancies so we can continue to provide reliable service to homes and businesses in the area.”

Engineering and design work on the project began in January, and crews broke ground at the substation site off Straw Road in South Gorham this spring. The addition of the new transformer requires a major substation expansion and reconfiguration of a 345 kV transmission line which will allow transformers to be operated together or separately for improved reliability in the Greater Portland Area. Crews will also expand the control house and install additional equipment that will enable the facility to accommodate additional transmission lines, should they be needed.

“This is just a part of many millions in system investments CMP is making in 2009,” says Carroll. Earlier this year, CMP completed electric grid enhancements in Woodstock in western Maine, and in Benton near Waterville. A major system improvement project serving Maine’s Midcoast area is scheduled to be completed later this month.

The South Gorham Substation expansion is expected to be completed in June of 2010.


About CMP: Central Maine Power, a subsidiary of Energy East Corporation, operates more than 25,000 miles of power lines and other facilities that deliver electricity to 80 percent of Maine’s population. Web site:
About Energy East: Energy East Corporation is a respected, super-regional energy services and delivery company serving about 3 million customers throughout upstate New York and New England. By providing outstanding customer service and meeting customers’ energy requirements in an environmentally responsible manner, Energy East will continue to be a valuable asset to the communities we serve.