Potomac Edison to rebuild 500 kV Maryland transmission line

The project will replace equipment that is more than 40 years old along a three-mile section of the existing transmission line

Potomac Edison, a unit of FirstEnergy Corp., is rebuilding a major 500 kV transmission line in Frederick County, Maryland, to enhance service reliability for existing customers and accommodate future electrical load growth in Maryland and West Virginia.

The project will replace equipment that is more than 40 years old along a three-mile section of the existing transmission line, using new conductors to increase the line's capacity by more than 60 percent. The total cost of the project is about $18 million, with $13 million expected to be spent in 2014.

Existing transmission structures also will be replaced with 14 new lattice steel structures from the Virginia/Maryland border to a Potomac Edisonsubstation in Frederick County, Md. Crews are erecting the new structures within the existing right-of-way in close proximity to the structures they replace. The new structures will average 130 feet in height.

The project was authorized by the PJM Interconnection Board in December 2010, and is scheduled for completion this summer. PJM Interconnection is the regional transmission organization that coordinates the movement of electricity and oversees reliability in all or part of 13 states and the District of Columbia.

Potomac Edison serves about 250,000 customers in seven Maryland counties and 132,000 customers in the Eastern Panhandle of West Virginia.

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