The Tusculum Substation is one of Greeneville Energy Authority’s (GEA) most significant and longstanding infrastructure assets. Due to aging equipment and growing capacity limitations, GEA has initiated a comprehensive rebuild of this facility. This article provides an overview of the substation’s background, its role in GEA’s service territory, and key details about the planned upgrade.
Overview & Location
The Tusculum Substation is located along Highway 11-E in front of the American Greetings facility. It serves as one of four delivery points through which GEA receives power from the Tennessee Valley Authority (TVA), and it is the oldest of the four. The substation was originally built and owned by TVA.
It is worth noting that despite its name, the town of Tusculum is primarily served not by this substation, but by GEA’s Shiloh Substation, which is located on the southern edge of Tusculum University’s campus and is fed from the Pioneer Substation delivery point.
Service Territory & Customer Impact
The Tusculum Substation plays a critical role in GEA’s overall service delivery:
- Currently serves approximately 10,400 customers (meters), representing more than 25% of GEA’s total customer base.
- Powers seven distribution substations throughout the area.
- Normal service territory extends from Baileyton to Horse Creek in Eastern Greene County.
Existing Equipment & Capacity Concerns
The existing transformers at the Tusculum Substation date to approximately 1962 and were originally manufactured in Italy. While they have served GEA reliably for decades, their age and capacity have become limiting factors for both growth and contingency planning in the area. The current equipment is no longer sufficient to meet the demands of a growing service territory or to provide adequate backup capacity in the event of an outage or emergency.
Upgrade Project Details
GEA has initiated a full rebuild of the Tusculum Substation. The following details outline the scope and financial components of the project:
- Total estimated project cost: $13,748,000
- Two new transformers: $9,093,050 — the largest single cost component of the rebuild.
- Transformer lead time: At the time of bidding, the fastest available lead time was 88 weeks from the date of order. Other manufacturers quoted even longer timelines.