The O42 Transmission Line Project (the Project) will upgrade approximately 3.2-mile-long segment of existing 69 kilovolt (kV) transmission line to a 115 kV transmission line, while remaining in operation as a 69 kilovolt (kV) transmission line. The Project will involve: Installing one (1) optical grounding wire from Dunstable Substation to Groton Street Substation, Select relocation of structure placement, Targeted replacement of existing wood structures to new steel structures, Targeted replacement of aging assets.

Project Benefit:

• A strong electrical transmission system is vital to our region’s safety, security, and economic prosperity
• The Project will modernize the existing transmission lines, replace equipment that has reached the end of its useful life, and install a telecommunication system between substations