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majorprojects

Greenwich Substation and Line Project

Eversource's application to build new transmission lines and a substation in Greenwich, Conn., was approved in November 2017.

PROJECT DESIGN

At Eversource, we're always working to serve you better. We are preparing to construct new 115-kilovolt (kV) underground transmission lines and build a new substation to enhance our ability to reliably serve customers in Greenwich.

The new lines will extend 2.3 miles from Eversource’s existing Cos Cob Substation on Sound Shore Drive to the new Greenwich Substation at 290 Railroad Avenue. The new lines will run underground, primarily within town streets, including the streets in Bruce Park.

In addition to the new substation and transmission lines, modifications are underway at the Cos Cob Substation located at 12 Sound Shore Drive.

Greenwich project map

Project Facts:

  • Underground route length: 2.3 miles
  • Location: Greenwich, Connecticut
  • Line voltage: 115,000-volt (115-kV) transmission line
  • Substation: One new transmission-level substation and modifications to the existing Cos Cob Substation
  • Siting review by: The Connecticut Siting Council (CSC)
  • Application filing to the CSC: June 26, 2015
  • CSC approval issued: November 9, 2017
  • Cos Cob Substation start of modifications: May 12, 2018
  • Start of preparation for warehouse building demolition and pre-construction site preparation for Greenwich Substation: September 12, 2018

Next Steps (estimated timetable, subject to change):

  • Development & Management (D&M) Plans (construction plans) to CSC for approval: First - Fourth Quarters 2018
  • CSC Decision on remaining D&M Plans: Fourth Quarter 2018
  • Start of construction on remaining project sections: Third - Fourth Quarters 2018 

CSC DEVELOPMENT & MANAGEMENT PLANS

Following receipt of the CSC’s application approval, Eversource is required to submit construction plans, called Development & Management Plans (D&M Plans), to the CSC for its approval before construction can begin. The D&M Plans include, but are not limited to, further design detail, final site plan, construction sequencing, traffic management plans, work hours and laydown/staging areas. There are multiple D&M Plans for this project.

On February 20, 2018, Eversource submitted the Cos Cob Substation D&M Plan to the CSC, and the Plan was approved by the CSC on April 12, 2018.

On May 18, 2018, Eversource submitted the Greenwich Substation Warehouse Building Demolition and Pre-Construction Site Preparation D&M Plan to the CSC, and the Plan was approved by the CSC on June 21, 2018.

On October 3, 2018, Eversource submitted the Greenwich 115-kV Underground Transmission Lines D&M Plan to the CSC.  The following seven documents are appendices to the D&M Plan: 

Eversource intends to submit the two remaining D&M Plans to the CSC in the coming months, one for the crossing of Indian Harbor and the other for construction of the new Greenwich Substation. The D&M Plans will be posted here as they become available.  

PROJECT CONSTRUCTION

Eversource will begin construction of the approved portion of the project after receipt of the CSC's approval of each D&M Plan. Work will be done in sections, rather than continuously in any one area.

Cos Cob Substation

Modifications to the Cos Cob Substation began on May 12, 2018, and will continue through 2019.

Work activities within the existing substation property will include vegetation removal; grading, digging and trenching; installation of new equipment and retaining walls; and then restoration of areas disturbed by the work.

Work hours will typically be 7 a.m. to 6 p.m., Monday through Friday, and 9 a.m. to 5 p.m. on Saturdays. Due to weather or other circumstances, from time to time the crews may need to work longer hours or work on a Sunday.

Greenwich Substation

Preparation for the removal of the existing warehouse and pre-construction site preparation for the substation began on September 12, 2018, and will continue through the end of the year.

Preparation includes the installation of a temporary security fence, removal of the building and related materials, vegetation removal, and grading of the site.

Work hours will typically be 7 a.m. to 6 p.m., Monday through Friday, and 9 a.m. to 5 p.m. on Saturdays. Due to weather or other circumstances, from time to time the crews may need to work longer hours or work on a Sunday.

COMMUNITY OUTREACH

Beginning with municipal briefings and other community outreach efforts, Eversource engages the community throughout the lifecycle of a project to provide information, answer questions and listen to concerns.

As the project proceeds through construction, Eversource is committed to updating neighbors, businesses, and the Greenwich community about construction activities in the area. 

CONTACT INFORMATION

For more information about the Greenwich Substation and Line Project, send an email to TransmissionInfo@eversource.com or call 800-793-2202.