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Southwest Connecticut Reliability Project

Construction on a new transmission line and substation upgrades in southwest Connecticut will begin in December 2017.

These improvements will strengthen the electric system and provide customers with the reliable power they need, both today and in the future.

The new line will extend 3.4 miles, crossing through the towns of Bethel, Danbury, and Brookfield, Conn. The line will be located entirely within Eversource’s existing transmission line right of way from Plumtree Substation (near Walnut Hill Road in Bethel) to an area near Park Ridge Road in Brookfield.

We will also make related modifications to the Plumtree Substation in Bethel and the Stony Hill Substation in Brookfield.


Line & Substation Construction

Construction on the new transmission line and upgrades at the substations will begin in December 2017.

Hours of construction will typically be 7 a.m. through 7 p.m., Monday through Saturday. Due to unforeseen weather or other circumstances, the workday may be extended or work may be performed on a Sunday. 

Project Facts:

  • Route length: Approximately 3.4 miles
  • Location: Bethel, Danbury and Brookfield, Connecticut
  • Line voltage: 115,000-volt (115-kV) overhead transmission line
  • Substation: Substation upgrades at both Plumtree Substation in Bethel, and Stony Hill Substation in Brookfield
  • Siting review by: The Connecticut Siting Council (CSC)

Estimated Timetable (subject to change):

  • Municipal Consultation Filing (MCF): April 14, 2016
  • Public open house: May 4, 2016
  • Connecticut Siting Council (CSC) Application filing: June 30, 2016
  • CSC Public Hearing: September 22, 2016
  • CSC Approval: November 10, 2016
  • Development & Management Plan approval: July 21, 2017
  • Start of construction (pending all necessary approvals): December 2017
  • Estimated in-service date: By the end of 2018


For an electric transmission line project, such as the Southwest Connecticut Reliability Project, the Municipal Consultation and Application Filing phases are part of the siting regulatory review process, as defined by the Connecticut state statutes. 

On November 10, 2016, the CSC voted to approve the Certificate of Environmental Compatibility and Public Need (Application) for the construction of the Southwest Connecticut Reliability Transmission Project.

The project’s construction plans, called Development and Management (D&M) Plans, were also submitted to the CSC for approval. On July 21, 2017, the CSC voted to approve the project’s D&M plans.


Beginning with municipal briefings and community outreach efforts related to the Project, we have made a concerted effort to engage town officials, residents, businesses, and other stakeholders to inform, answer questions, and listen to concerns about the project.

As work proceeds into and throughout construction, we will continue these outreach efforts.


For more information, send an email to or call 800-793-2202.