Connecticut Light and Power d/b/a Eversource Energy (NYSE:ES), in a May 8 petition filed with the Connecticut Public Utilities Regulatory Authority, said that it is seeking approval of the “method and manner of construction and permission to energize the 1470 Line Upgrade Project.”
The purpose of the project is to bring the electric supply system in southwest Connecticut into compliance with applicable national and regional reliability standards and criteria by eliminating potential thermal criteria violations and increase the line ratings, the company said.
The proposed construction would take place between the Peaceable substation and the Wilton substation in the municipalities of Redding, Weston, and Wilton, within an existing Eversource right of way (ROW), the company said.
The entire length of the project is about five miles, the company said, adding that the project involves upgrading and reconductoring an existing 115-kV, 60-hertz, three-phase, three-conductor circuit supported on a line of lattice structures and wood three-pole structures, and replacing 33 existing structures – 27 wood H-frame structures, three wood poles, and three lattice towers – with 17 weathering steel H-frame structures (ranging in height from about 52 feet above ground level to 79 feet above ground level); 12 weathering steel 3-pole structures (ranging in height from about 61 feet above ground level to 92.5 feet above ground level); and four weathering steel monopoles (ranging in height from about 70 feet above ground level to 101 feet above ground level).
The original approval for the construction of the line was given by the state Department of Public Utility Control in 1941, the company noted.
Lightning protection would consist of one overhead lightning shield wire with optical glass fibers for communication purposes and one overhead aluminum clad steel lightning shield wire on H-frame structures, as well as one overhead lightning shield wire with optical glass fibers for communication purposes on lattice tower and monopole structures, the company said.
Project construction is scheduled to begin in August, with completion anticipated by November, the company noted, adding that since construction would involve multiple outages and re-energizing of the circuit as the proposed work is being done, the company seeks permission to energize during and after the construction period.
The Connecticut Siting Council in March 2017 ruled that the project would not require a certificate of environmental compatibility and public need, the company said, adding that the council last month approved modifications to the project.
Eversource spokesperson Al Lara on May 14 told TransmissionHub, “We are in the process of evaluating proposals from construction companies for the 1470 Line Upgrade Project, so it’s too early to offer an estimated project cost.”