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UCMP Danbury

Why Are We Doing This Project?

As part of our ongoing commitment to deliver reliable energy and superior service to our customers, we are proposing to replace existing 115-kilovolt (kV) high pressure fluid-filled (HPFF) underground transmission lines with new 115-kV cross-linked polyethylene (XLPE) transmission lines. 

Two underground transmission lines in Danbury, the 1270 and 1337 lines, were built in 1976 and are past their useful life expectancy.​ Replacing the existing HPFF with XLPE will modernize the existing transmission system and increase reliability.

The proposed project is part of a larger program we are conducting throughout our service territory in Connecticut and Massachusetts related to underground cable modernization. This program is designed to modernize and increase the capacity of the existing underground transmission cable systems by replacing existing fluid-filled cable with cross-linked polyethylene cable. 

Where Is This Work Being Done?

The 1270/1337 underground transmission lines run from Triangle Substation to Middle River Substation, both in Danbury, Connecticut. 

When Is The Work Being Done?

  • Petition filing to the Connecticut Siting Council: Spring 2024
  • Connecticut Siting Council decision: Fall 2024
  • Proposed start of construction: Fall 2024

*Subject to change, pending necessary approvals

About this project

  • Route length: 4 miles
  • Line voltage: 115 kilovolts (kV)
  • Siting review by: Connecticut Siting Council (CSC)

Siting Review

This project requires a petition filed with the CSC. We intend to submit this petition to the CSC in spring of 2024. Environmental permits will also be required from state and federal agencies. 

Community Outreach

We're committed to engaging city officials, residents, businesses, community groups and other stakeholders about project activities through municipal briefings, mailings, virtual meetings and door-to-door outreach.

Our team strives to incorporate local feedback into the project’s development wherever feasible. Team members will remain engaged with the community throughout phases of the project.

Have Questions?

Keeping the lines of communication open is an important part of our work in your community. We welcome input from the community.

For more information about this project, please call the project information hotline at 1-800-793-2202 or email