Noting that it has kicked off the start of construction of the Pottersville substation in Somerset, Mass., National Grid on May 30 said that it is investing more than $100m in its electric transmission system to increase reliability in southeastern Massachusetts.
The new substation is part of a larger suite of transmission projects, Brian Gemmell, National Grid vice president of Transmission Asset Management and Planning, said in the statement.
The company noted that the Pottersville substation is one of two substations to be built, with the other one being the Grand Army substation, which will be a compact-design facility, with the equipment located inside of a building instead of out in the open, allowing the substation to be built on a smaller site.
Other planned projects include upgrading the existing transmission lines between the new Pottersville and Grand Army substations, and between Grand Army and an existing substation at the former Brayton Point power station, the company said.
According to the projects’ website, the Grand Army substation will be built on Lees River Avenue, while the Pottersville substation will be built on Riverside Avenue.
Noting that it is upgrading the existing transmission lines between the Grand Army and Pottersville substations, National Grid said on the website that those modifications include reconductoring the lines and replacing, or improving, some structures that may include raising the structures’ height. The length of the line right of way (ROW) is about 2.75 miles, National Grid said, adding that there are 36 structures – lattice towers – within the first 2.25 miles of the ROW. A new section of line will be built in the last 0.5 mile of the ROW that leads to the Grand Army site, the company said.
National Grid noted that it is making improvements to two transmission lines that run between the Brayton Point and Grand Army substations. The lines in the ROW are supported by 22 structures, the company said, adding that some structures in the 1.5-mile ROW will be replaced to improve reliability. All planned upgrades are expected to take place in the existing ROW, National Grid said.
Construction of the two substations and most of the transmission line work will begin this year and continue into 2019, National Grid said in its statement, adding that it expects to have all of the projects completed and operational in mid-2020.