Eversource Energy’s (NYSE:ES) estimated $12.1m, 115-kV 1810 Transmission Line Upgrade Project in Connecticut went into service last November, and restoration is still planned for this summer, a company spokesperson told TransmissionHub on March 24.
As noted on the project’s webpage, the project traverses 3.5 miles on existing transmission line rights of way (ROWs) through Bristol and Southington. As part of the project, Eversource replaced 14 existing structures, reinforced 10 existing structures, and rewired 3.5 miles of the existing 115-kV line. The site also noted that existing equipment was upgraded at the Southington substation, within the existing fence line.
The spokesperson noted that construction on the estimated $37.9m Bloomfield-Windsor Transmission Upgrade Project began last October, and the project is still on schedule to be in service in 4Q17.
According to the 115-kV project’s webpage, the project involves separating 6.9 miles of an existing transmission line in Bloomfield and moving it from existing structures onto new structures. Eversource is also installing new equipment at the North Bloomfield and Bloomfield substations as part of the project. In Windsor, the site added, Eversource is reconfiguring an existing transmission line outside the Rood Avenue substation, while adding new equipment and expanding the substation’s fence line.
Construction began last November on another Eversource project – the 10.4-mile Frost Bridge to Campville 115-kV Transmission Project, which the spokesperson said has a total estimated cost of $51m.
According to the project’s webpage, the project is estimated to be in service in 2018.
The line crosses the towns of Watertown, Thomaston, Litchfield, and Harwinton to connect Eversource’s Frost Bridge substation in Watertown with its Campville substation in Harwinton, the site said. The line is located entirely within the company’s existing transmission line right of way (ROW), according to the site, which also noted that new equipment is being installed at both substations.
As part of the project, Eversource is also reconfiguring two 115-kV lines where they cross the Naugatuck River at the Litchfield/Harwinton town lines, the site said, noting that that reconfiguration will increase reliability by allowing each line to be supported by its own set of structures.
The Connecticut Siting Council (CSC) last September voted to approve the project’s Development and Management (D&M) Plans, which are the project’s construction plans, and an update to the “D&M Plan, Volume 3 (Maps)” was submitted to the CSC for approval in January, according to the site.
The spokesperson said that a D&M Plan for another project, the estimated $24.4m, 115-kV Southwest Connecticut Reliability Project, is targeted to be submitted to the CSC in 2Q17.
According to the project’s webpage, the new line would extend 3.4 miles, crossing through the towns of Bethel, Danbury, and Brookfield. The line would be located entirely within the company’s existing transmission line ROW from the Plumtree substation, near Walnut Hill Road in Bethel, to the Brookfield Junction, near Park Ridge Road in Brookfield. The site also noted that as part of the project, Eversource would make related modifications to the Plumtree substation and the Stony Hill substation in Brookfield.
According to the site, pending all necessary approvals, project construction would begin in 3Q17, and the project is estimated to be in service by the end of 2018.
Of the Greenwich Substation and Line Project, the spokesperson said that the CSC last May denied Eversource’s application to build a new transmission line and substation in Greenwich, and subsequently directed the company and the Town of Greenwich to work together to find a more acceptable solution.
“Since then, we have worked with the town to find a mutually acceptable solution,” the spokesperson said. “After thoroughly examining many solution options, we are preparing to file a revised project proposal with the CSC in the second quarter of 2017. The revised proposal will include a revised route, a new substation location and other input from the Town of Greenwich.”
According to the project’s webpage, the proposed 115-kV line would extend about 2.3 miles between Eversource’s existing substation on Sound Shore Drive in Cos Cob to the proposed substation on Railroad Avenue.
The project is needed to address increasing customer demand and to improve reliability of electric supply in Greenwich, according to the site, which also noted that the existing electric infrastructure serving Greenwich is expected to reach its maximum capacity this year under certain operating conditions. By adding the new substation, the company would be able to meet the expected customer demand for about 30 years, according to the site.
The spokesperson noted that the scope of another project, the Greater Hartford Central Connecticut Reliability Project, has changed, and that a new project route is being proposed. The original estimated cost for the project was $99.8m, the spokesperson said, noting that the revised cost and a new application will be filed with the CSC later this year.
According to the 115-kV project’s webpage, a 3.8-mile underground line would be built between Eversource’s Newington substation in Newington and the company’s Southwest Hartford substation in Hartford, passing through portions of Newington, West Hartford and Hartford. Eversource would also upgrade its Newington and Southwest Hartford substations with new equipment.
Pending all necessary approvals, project construction would begin in 2Q18, and the project is estimated to be in service in mid-2019, the site added.