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Eversource is proposing to rebuild an existing transmission line between Frost Bridge Substation in Watertown, Conn. and Campville Substation in Harwinton, Conn.


Maintaining infrastructure is one of the many ways Eversource supports the safe and secure transmission of electricity throughout the region.  Eversource is proposing to rebuild an existing 115-kilovolt (kV) electric line along approximately 10 miles of Eversource right-of-way, (transmission line corridor), between our Frost Bridge Substation in Watertown, Conn. and Campville Substation in Harwinton, Conn. The proposed project traverses the towns of Watertown, Thomaston, Litchfield and Harwinton.

The 1191 Line was originally built in 1933. The Project proposes to replace all original wood structures (97 in total), three steel structures and one lattice tower with new weathering steel monopoles. In addition, the project scope involves replacing the existing conductor (wire) due to age and condition. 

1191 Line Rebuild Map

*Click to enlarge


  • Overhead line route length: ~10 miles
  • Location: Watertown, Thomaston, Litchfield and Harwinton, Connecticut
  • Line voltage: 115,000-volt (115-kV) transmission line
  • Siting review by: The Connecticut Siting Council (CSC)
  • Petition filing to the CSC: September 18, 2020
  • CSC Decision Issued: Approval on January 28, 2021
  • Start of construction: February 15, 2021
  • In-service date: September 27, 2021

*Pending all necessary approvals


Beginning with municipal briefings and other community outreach efforts, Eversource engages the community throughout the lifecycle of a project to provide information, answer questions and address concerns.

As the Project proceeds through construction, Eversource is committed to updating neighbors, businesses, and the community about construction activities in the Project area. 


For more information about the 1191 Line Rebuild Project, please email or call 800-793-2202.