Somerset, MA

Current Projects

National Grid is taking a holistic look at reliability needs and asset upgrades in southeastern Massachusetts, including in the Town of Somerset. A strong electrical transmission system is vital to this region’s safety, security, and economic prosperity.

Planned projects for Somerset include constructing the new Grand Army Substation on Lees River Avenue and the new Pottersville Substation on Riverside Avenue, and upgrading the Brayton Point Substation located at the former Brayton Point Power Station site.

Work is also planned for the transmission lines that connect Brayton Point to Grand Army, as well as to the transmission lines between the Grand Army and Pottersville Substations. (see map)

There will be no disruption of electrical service to customers in order to complete these projects.

Related Projects

National Grid is upgrading the existing transmission lines between the Grand Army and Pottersville Substations.

These modifications include reconductoring (replacing the wires that transmit the power) the transmission lines and replacement of or improvements to some structures that may include raising the height of the structures.

  • The length of the transmission line right-of-way is approximately 2.75 miles.
  • There are 36 structures (lattice towers) within the first 2.25 miles of the right-of-way (ROW).
  • A new section of transmission line will be built in the last 0.5 mile of the ROW that leads to the Grand Army site.

The construction phase for this transmission line work is 2018-2019.

National Grid is making improvements to two transmission lines that run between the Brayton Point and Grand Army Substations.

  • The two transmission lines in the ROW are supported by 22 structures.
  • Some transmission structures in the 1.5-mile long ROW will be replaced to improve reliability.
  • All planned upgrades are expected to take place in the existing ROW.

The construction phase for this transmission line work is 2019. (See Construction Letter Spring 2019 above for more info)

National Grid is making improvements to its Brayton Point Substation, located adjacent to the former Brayton Point Power Station, to support the growing transmission needs of this area.

  • The substation improvements are not related to any planned reuse of the former power plant site.
  • The substation is an integral part of the transmission system and will remain in operation during and after any redevelopment of the site.

Upgrades to equipment, including the addition of a new transformer, will take place in 2019.

Projects Map

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Projects Map

Electricity 101

If you’re like most people, how the power grid works isn’t something you think about every day—you flip the switch and the lights come on. However, in reality it takes a complex network to deliver this vital service.

Below is a simple depiction that walks through the basic steps in the electrical grid.


All the electrical power that we use starts at a power plant where a generator produces electricity. Generators can be fueled by coal, oil, natural gas, nuclear, or renewable sources, such as hydroelectric, solar, and wind power.


From the generator, power leaves and enters a transmission substation, which converts the generator's voltage to extremely high voltages for long-distance travel on the transmission grid. Transmission lines efficiency carry that high voltage power over the long distances.


From the transmission lines, the power is converted to a lower voltage at a substation that sends power to the distribution lines—the lines you see long your town or city streets—and, ultimately, that powers your home or business.