Project Highlights 

The original VELCO St. Johnsbury Substation was built in 1972, with various modifications and improvements occurring over the subsequent nearly fifty years of service. VELCO conducted a condition assessment of the substation and identified the need to replace some of the equipment due to condition. Deficiencies were identified in the equipment such as the control building, 220 circuit switcher, 34.5 kV circuit breakers, protection and control relays, and the substation fence. 

The project will require VELCO to install a temporary configuration and temporary 34.5 kV lines to maintain service to the GMP subtransmission system. 

The following upgrades to the VELCO St. Johnsbury Substation will improve reliability of electric facilities serving portions of Vermont. 

  • Replace the existing 25’ x 31’ VELCO control building with a new, approximately 32’ x 70’ control building that will accommodate the protection and control system, redundant AC & DC station services, communication equipment, and security systems. The new control building will be located on the southern side of the substation. 
  • Replace the existing 220 circuit switcher with a new K220 SF6 gas circuit breaker that meets VELCO’s design standards. 
  • Expand the fence to accommodate the new control building, and to improve access to equipment for maintenance. The substation fence expansion will be approximately 15 feet to the north, 15 feet to the west, and 55 feet to the south. 
  • Reconstruct and widen driveway to 20 feet with turn-around. Improve site drainage. 
  • Perform tree clearing to accommodate the temporary infrastructure, temporary substation/construction area support area, expanded substation yard and driveway improvements.


  1. Public Outreach

    VELCO project team hosted a public meeting and met with the Town Selectboard to answer questions about the project and listen to community concerns.

  2. Application for Regulatory Approval

    VELCO expects to submit an application for regulatory approval.

  3. Construction

    VELCO anticipates construction to begin in Spring 2024

  4. Anticipated Completion

    VELCO anticipates the upgraded substation to be commissioned by Fall 2024.

Project Features
Asset Maintenance
Asset Maintenance

Upgrades to existing electric transmission infrastructure.


Transmission additions or upgrades, necessary to ensure the system’s continued reliability. 

Resources & Documents
Advance Notice

The 45-Day Notice package is a detailed project description sent 45 days before filing with the Public Utility Commission to local select boards and other officials to enable community leaders to review and discuss the project’s impacts with residents, and to provide input before the start of formal proceedings before the Commission. The 45-day notice is a requirement of Vermont law and Public Utility Commission rules.

Download the St. Johnsbury substation Project 45-day notice package. 

Permitting Documents