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Greater Hartford - Central Connecticut Reliability Project

Eversource is preparing to construct a new 115-kilovolt (kV) transmission line in the Greater Hartford and central Connecticut area. These improvements will strengthen our system and enhance our ability to reliably serve electrical demand, in keeping with national and regional reliability standards.

At Eversource, we're always working to serve you better. The 3.7-mile hybrid overhead and underground line will be constructed between our Newington Substation in Newington, Connecticut, and our Southwest Hartford Substation in Hartford, passing through portions of Newington, West Hartford and Hartford. The new line would be located within Eversource's existing transmission and distribution line rights of way, under town streets and along the existing Amtrak rights of way.

To improve system reliability, cost-effectiveness and the environment, we will also be upgrading our Newington and Southwest Hartford Substations with new equipment. The project will also allow power to be redirected – for example, north to south – during times of high customer demand.

Greater Hartford - Central Connecticut Reliability Project Map

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Project Facts:

  • Route length:  Approximately 3.7 miles
  • Line Location: Newington, West Hartford and Hartford, Connecticut
  • Line voltage:  115,000-volt (115-kV) transmission line
  • Substations: Substation upgrades at Newington Substation in Newington and Southwest Hartford Substation in Hartford.
  • Siting review by: The Connecticut Siting Council (CSC)

 Estimated Timetable (subject to change):

  • Municipal Consultation Filing (MCF): December 18, 2015
  • Public open house: January 20, 2016, and April 27, 2017
  • Connecticut Siting Council (CSC) Application filing: June 7, 2017
  • CSC Public Hearing: August 22, 2017
  • CSC Approval: February 1, 2018
  • Development & Management Plan to CSC for approval: Second Quarter 2018
  • Start of construction (pending all necessary approvals): Third Quarter 2018
  • Estimated in-service date: Mid-2019

Connecticut Siting Council (CSC) Application Filing

For an electric transmission line project such as the Greater Hartford - Central Connecticut Reliability Project, the Municipal Consultation and Application Filing phases are part of the regulatory review process, as defined by the Connecticut state statutes. On February 1, 2018, the CSC voted to approve the Certificate of Environmental Compatibility and Public Need (Application) for the construction of the Greater Hartford - Central Connecticut Reliability Project. 

Development & Management Plan

In the second quarter of 2018, Eversource will submit the project's construction plan, called the Development & Management (D&M) Plan, to the CSC for approval. The D&M Plans include, among other things, conditions ordered by the CSC in its Decision, and a detailed site plan showing work areas, structure foundations, and substation upgrades. 

Contact Information

For more information about the Greater Hartford - Central Connecticut Reliability Project, send an email to or call 800-793-2202.