Georgia Substation Project
In 2011, VELCO proposed to construct a substation west of an existing substation in Georgia, Vermont, to provide a redundant path and additional capacity to deliver power to the Georgia area.
Needs & Benefits
The Georgia substation interconnects VELCO's electric transmission network northwest Vermont and feeds the electric distribution system serving GMP and VEC customers. Failures of key transmission components cause low-voltage conditions that violate system standards, voltage instability/collapse, or thermal overloads, which could result in extended outages for the areas served by the transmission system.
Transmission utilities, such as VELCO, are required to design, operate and maintain a transmission network according to national and regional reliability standards. Planning studies by VELCO and ISO New England, New England's bulk electric system provider, reveal that the existing Georgia substation does not meet current federally mandated reliability requirements.
As outlined in VELCO's 2009 Long-Range Transmission Plan, the vulnerability of the current substation design results in system reliability problems, which under certain circumstances may lead to loss of service, system outages and low voltage. These concerns can be addressed by constructing the proposed substation using a robust design such as a ring bus or a breaker-and-a-half substation. Building a new VELCO Georgia substation with a new six-breaker ring substation to connect the transmission lines serving northwest Vermont will resolve current reliability criteria violations that result from a single transmission element's failure at the substation.
- 115 kV aluminum bus structure
- Six circuit breakers
- Transmission control building
- Connections to VELCO's existing 115 kV transmission lines
- Existing capacitor bank
Now completed, part of the existing transmission lines as well as the existing Georgia substation was decommissioned and the existing equipment was retired as part of the project.
VELCO's aesthetic consultant reviewed the preliminary design plans and performed a visual analysis of the areas of the proposed Project. The findings indicated that any visual impacts created by the Project will be minimal and that the impacts will not be significantly adverse. The Project site is well set back from surrounding roads and existing vegetation will screen public views to the substation. The Project will be most visible from Dexter Road and Sand Hill Road, however, these views will be buffered by existing vegetation. A full analysis of potential aesthetic impacts and proposed landscaping mitigation measures was included with the project petition.
VELCO has continued to assess the area's transmission need by conducting additional planning studies to select the best transmission solution. Alternative sites were evaluated and the proposed site was retained because of its lower environmental impact, as well as it favorable terrain conditions, which led to lower construction costs.
VELCO's noise consultant assessed the potential noise impacts associated with the substation relocation. A complete engineering noise analysis was provided as part of the Project's filing with the Public Service Board.
- Spring 2011
- Public meetings
- Regulatory & permitting process
- Spring 2012
- Construction start
- Spring 2013
- Construction complete