USA, New England: National Grid has begun a multi-year $470 M transmission upgrade to modernise a high-voltage line running from Vernon, Vermont, through south-eastern New Hampshire and into Franklin and Worcester counties in Massachusetts.
The A1/B2 Transmission Line Project will replace structures and foundations, install new conductors, improve right-of-way access and carry out vegetation management along the route. National Grid said the work is needed because the existing infrastructure is approaching the end of its useful life.
The project covers more than 570 structures along a roughly 75-km (47-mi) corridor and connects with upgraded lines already completed in New Hampshire and Vermont.
According to National Grid, the line dates back to 1909 and is believed to be the oldest transmission line in New England. Aside from repairs and vegetation clearing, the company said the infrastructure has not undergone major upgrades since it was built.
The utility said the existing system no longer meets modern reliability and capacity needs. Its current design makes it more vulnerable to outages caused by lightning, vegetation and other environmental factors, while also limiting access for modern maintenance equipment.
The upgraded corridor is expected to be completed and in operation by late 2030. The cost of the project will be reflected gradually in customer bills over several years.
National Grid said the investment will help strengthen transmission capacity, support economic activity and prepare the network for growing electricity demand linked to electrification of heating and transport.
Work is already under way in Warwick and Royalston, while Athol is expected to receive tap line upgrades to the Chestnut Hill Avenue Substation from May 2029.
Source: Greenfield Recorder
