Project Overview

The project involves the installation of a SmartValve, also known as an Advanced Power Flow Controller (APFC) at the existing Sand Bar Station. An APFC is a technology that allows precise control of electricity flow through power lines, helping to balance loads and prevent overloads that can lead to power outages. Specifically, we will be installing twelve (12) APFC modules adjacent to the existing substation.

This installation requires an expansion of the Station's eastern fence line to accommodate the APFC equipment, including SmartValves, bus work, and instrument transformers. We will also be installing three (3) new motor-operated load break switches within the existing station. Additionally, two (2) sections of the existing K19 115kV transmission line will be relocated to facilitate the expansion and maintenance access.

To support this work, tree clearing and grading will be necessary for the station yard expansion, transmission line relocation, and creation of natural resource habitat. A new construction access driveway will be constructed to provide construction access.

Why is this Project Necessary?

The Sand Bar Station's Phase Shifting Transformer (PST) is experiencing excessive "tap changes" caused by increasingly variable power flow. This variability is further increased by the integration of renewable energy sources into the grid. A previous PST failure resulted in a lengthy outage and a difficult replacement process.

To address this, we are installing an APFC in series with the existing PST. This will significantly reduce the number of tap changes, extending the PST's lifespan. This solution was selected as the most cost-effective and efficient option, offering more precise control, technology diversity, and a shorter lead time compared to other alternatives.

Environmental and Community Considerations

VELCO is committed to minimizing the project's impact on the environment and the community. We have engaged VHB Inc. to conduct a thorough inventory and assessment of natural resources in the project area, and we will collaborate with the Vermont Agency of Natural Resources to mitigate any potential impacts.

Aesthetic impacts are also a priority. A preliminary review has been conducted, and a detailed aesthetic assessment will be provided in our petition to the Commission. This assessment will include a review of local and regional planning documents to ensure we address scenic resources and open space.

VELCO’s sound consultant, has assessed the potential noise impacts associated with the Project.  A complete engineering noise analysis will be provided as part of the Project’s filing with the Commission.  VELCO does not anticipate that noise mitigation will be required for the Project.

Traffic impacts are expected to be minimal and short-term, primarily during equipment and material deliveries. Existing roads and the Sand Bar station's driveway and yard will be used for deliveries, and traffic control personnel will be employed for large equipment deliveries.

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 Sand Bar Station Project 45-day notice package.