On October 9, 2014, TVA issued an environmental assessment and finding of no significant impact for the proposed construction, operation, and maintenance of a 16-mile 161-kilovolt (kV) transmission line in Lee and Union counties, Mississippi. The proposed transmission line would improve the power supply system in Union and Lee counties and surrounding areas in Mississippi, by providing a third 161-kilovolt (kV) transmission line between the Union 500-kV Substation in Union County and the Tupelo 161-kV Substation in Lee County.
The new 16-mile transmission line section would be constructed from the Union 500-kV Substation to a tap point (existing Structure 62 in the Tupelo-Turner Park 161-kV Transmission Line) outside the Tombigbee Electric Power Association’s Turner Park 161-kV Substation north of Tupelo. Beginning at the tap point, the existing 6.6-mile Tupelo-Turner Park 161-kV Transmission Line would complete the approximately 22.6 mile connection between the Union 500-kV Substation and the Tupelo 161-kV Substation (i.e., the Union-Tupelo No. 3 161-kV Transmission Line).
A 100-foot-wide right-of-way (ROW) would be required for the entire length of the line. Approximately 10.5 miles would parallel TVA’s existing Browns Ferry-Union 500-kV Transmission Line. The proposed line would occupy about 102 acres of new ROW and 92 acres of existing ROW. To accommodate possible future system needs, the proposed transmission line would consist of double steel-poles capable of supporting two circuits.
Additionally, TVA would install a new breaker and bay at the Union 500-kV Substation and a new transformer at the Tupelo 161-kV Substation. TVA would update displays at its control centers in Chattanooga to indicate the status of the new facilities.
More information on this environmental review can be obtained from: