Greenwich Substation and Line Project
Eversource's application to build new transmission lines and a substation in Greenwich, Conn., was approved in November 2017.
Eversource is preparing to construct new 115-kilovolt (kV) underground transmission lines and build a new substation to enhance its ability to reliably serve its Greenwich customers.
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 will be made at the Cos Cob Substation located at 12 Sound Shore Drive.
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- 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
Next Steps (estimated timetable, subject to change):
- Development & Management (D&M) Plans (construction plans) to CSC for approval: First Quarter 2018
- CSC Decision on D&M Plans: Second Quarter 2018
- Pending approval, start of construction: Second Quarter 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.
On February 20, 2018, Eversource submitted the Cos Cob D&M Plan to the CSC.
Eversource intends to submit the remaining two D&M plans, for the new transmission lines and the new Greenwich Substation, to the CSC in April 2018. The D&M Plans will be posted to this web page as they become available.
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 to construction, Eversource is committed to updating neighbors, businesses, and the Greenwich community about construction activities in the area.
For more information about the Greenwich Substation and Line Project, send an email to TransmissionInfo@eversource.com or call 800-793-2202.