en español

Why Are We Doing This Project?

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

The underground transmission lines 1753 and 1792 were built in 1968 and are past their useful life expectancy.​

Replacing the existing HPFF with XLPE will modernize the existing transmission system and increase reliability by:

• Proactively addressing any issues obtaining supplies needed for system repairs and upgrades
• Upgrading to a system technology with longer life expectancy
• Reducing occurrence of unplanned outages which may require the need for emergency replacement or repair
• Eliminating the risk of oil leaks from existing HPFF cables
• Potentially increasing line capacity for future load growth 

The project is part of a larger program we are conducting throughout our service territory in Connecticut and Massachusetts called the Underground Cable Modernization Program (UCMP).

Where Is This Work Being Done?

The 1753/1792 underground transmission lines run from Glenbrook substation to Cedar Heights substation, both in Stamford, Connecticut.

The replacement lines will follow the same or similar route whenever possible, under the roadway.

*Click map to enlarge

About this project

• Route length: 5 miles
• Line voltage: 115 kilovolts (kV)
• Siting review by: Connecticut Siting Council (CSC)

Construction Updates

July 2026

Duct bank and vault installations at the following locations:

• Strawberry Hill Avenue (between Holbrook Drive & Colonial Road)
• Colonial Road between Strawberry Hill Avenue and Pilgrim Walk
• Vine Road between Pepper Ridge Road and High Ridge Road
• Scofield Avenue between Hope Street and Glenbrook Road
• Newfield Avenue and Vine Road Intersection  

Newfield Avenue and Vine Road Intersection  

• Colonial Road Expected to be done by July 4th (can include) 

We take every safety precaution while working in local communities and all people working on the construction project carry identification. The project work will not interrupt electric service to homes or businesses. The schedule may change due to weather or other unexpected circumstances.

Siting Review

The project requires a petition with the CSC. 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, public information sessions and door-to-door outreach.

Our team strives to incorporate local feedback into the project's development wherever feasible. Project team members will remain engaged with the community to provide schedule updates and address questions and concerns. 

Information is available in Spanish and other languages upon request.