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Greater Hartford - Central Connecticut Reliability Project

Eversource is constructing 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 will be located within Eversource's existing transmission and distribution line rights of way (power line corridors), under town streets and along the existing overhead Amtrak rights of way.

A step-by-step guide to both the overhead and underground construction process for the project is available.

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)
  • Public Open Houses: January 20, 2016, and April 27, 2017
  • Application filing to the CSC: June 7, 2017
  • CSC Public Hearing: August 22, 2017
  • CSC approval issued: February 1, 2018
  • Development & Management Plans (D&M) (construction plans) for underground transmission line and substation modifications approved by CSC: August 31, 2018
  • Start of construction on Newington Substation modifications: October 10, 2018
  • Start of construction on underground line and Southwest Hartford Substation modifications: November 2018
  • Overhead transmission line D&M Plan to CSC for approval: March 1, 2019

 Next Steps (estimated timetable, subject to change):

  • CSC Decision on overhead line D&M Plan: Second Quarter 2019
  • Start of construction on overhead line (pending all necessary approvals): Mid-2019
  • Estimated in-service date: Late 2019


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 siting regulatory review process, as defined by the Connecticut state statutes.

On February 1, 2018, the Connecticut Siting Council (CSC) voted to approve the Certificate of Environmental Compatibility and Public Need (Application) for the construction of the Greater Hartford - Central Connecticut Reliability Project.

The project's construction plans, called Development and Management (D&M) Plans, are also submitted to the CSC for approval. 

On August 31, 2018, the CSC voted to approve the following D&M Plans:

On March 1, 2019, Eversource submitted the following to the CSC for approval:


Beginning with municipal briefings and community outreach about the siting stage of 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 throughout construction, we will continue these outreach efforts.


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