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Greater Hartford - Central Connecticut Reliability Project

Eversource recently completed construction of a new 115-kilovolt (kV) transmission line in the Greater Hartford and central Connecticut area. These improvements were designed to strengthen our system and enhance our ability to reliably serve electrical demand, in keeping with national and regional reliability standards.

The 3.7-mile transmission upgrade project is now in service and providing additional system reliability for customers in the greater Hartford region. The improvement project includes enhancements to two local substations and a new 115-kilovolt electric transmission line from Newington to Hartford. These upgrades enable power to be redirected – for example, north to south – during time of high customer demand.

The new line is 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.

Greater Hartford - Central Connecticut Reliability Project Map

* Click to Enlarge

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 Decision issued: February 1, 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
  • CSC Decision on overhead line D&M Plan: April 26, 2019
  • Start of construction on overhead line: April 2020

 Next Steps (estimated timetable, subject to change):

  • In-service date: Fourth quarter 2020


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 issued its decision for the following D&M Plans:

On March 1, 2019, Eversource submitted the New 115-kV Transmission Line - Overhead Segment - D&M Plan to the CSC. The CSC issued its Decision on April 26, 2019.


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.

Restoration and landscape work related to the project will continue through the fall and winter. Eversource continues to work closely with community leaders and property owners during this final phase of the project to address any issues that may arise.


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