The Salem Cable Project

Technical Details



National Grid’s existing S-145 cable system (installed in 1972) and T-146 cable system (installed in 1951) in Salem are nearing the end of their service lives and must be  updated to meet regional demand for electricity and  reliability. Due to age, both cable systems have experienced dielectric fluid releases in recent years, creating reliability, cost, and environmental concerns and causing service outages whenever National Grid workers have to conduct quick, temporary repairs, which have become increasingly difficult and expensive as the cables have aged.

Thus, beginning in January 2015, National Grid will construct two new 115 kV underground cables between the Salem Harbor and the Canal Street Substation, with as little impact on residents, businesses and visitors as possible. Providing safe and reliable service to our consumers in Salem and beyond remains our highest priority, and we look forward to working with you to complete this project with as little impact as possible..


The new Salem cable system will be installed underground along approximately 1.63 miles of existing public ways between Salem Harbor and Canal Street Substations. The cables will be installed in a ductbank and manhole system.  The ductbanks will  be approximately four feet wide by five to eight feet deep.

In order to shorten the construction process as much as possible, different phases of ductbank and manhole installation may take place simultaneously at different sites. Dirt and debris displaced by the construction will be trucked away from the work area to reduce the size of each site and its effects on the local community and on traffic. At each site, street restoration will consist of a temporary patch following duct bank installation, followed by repairs or replacements as required by the Salem Department of Public Works ("DPW") and the Massachusetts Department of Transportation ("MassDOT").

Potential impacts from project construction will likely include temporary traffic congestion, construction noise, and sediment and dust generation. National Grid will make every effort to help minimize and mitigate potential temporary impacts from construction.

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