Eversource Launches Underground Cable Upgrade Project In Danbury

DANBURY, CT — Eversource is beginning construction on a multi-year project to replace aging underground electric transmission lines in Danbury, part of a broader modernization effort aimed at improving system reliability and meeting growing energy needs.

The Underground Cable Modernization Program involves replacing two 115-kilovolt underground transmission lines originally installed in 1974. The utility said the new cables will feature more advanced technology designed to enhance performance, reduce the risk of fluid leaks, and lessen environmental impacts.

About 3.6 miles of new cable will be installed in phases between the Middle River and Triangle Street substations. According to Eversource, the work will not disrupt service for customers, and the company will coordinate with the city on roadway restoration once the installation is complete.

Construction began Monday, and crews will typically work Monday through Saturday from 7 a.m. to 7 p.m., weather permitting. The project is expected to finish by late 2027, with full roadway restoration continuing into 2028.

The project will take place in two segments. The first, beginning this month, will run from the Middle River Substation to Interstate 84 along Westville Avenue Extension, Gregory Street, and Franklin Street Extension. The second phase, set to start in early 2026, will extend from I-84 to the Triangle Street Substation via Franklin Street, Garamella Boulevard, Osborne Street, 9th Avenue, White Street, Taylor Street, Wildman Street, and Triangle Street.

Eversource said it continues to coordinate with city officials and local residents to minimize traffic disruptions and align its schedule with other planned roadwork. Residents near the project route have been notified through mail and door-to-door outreach.