Estimated in-service date: December 29, 2016
Voltage: 115 kV line
Estimated length: 8 miles (new substation, substation upgrades)
Estimated cost: $60 million
The Sioux Falls Northern Loop transmission line project in Sioux Falls, S.D. was energized on December 29, 2016. The project included rebuilding 8 miles of Xcel Energy’s 69 kilovolt (kV) system to 115 kV in the northern half of the city between the West Sioux Falls (WSF) and Split Rock (SPK) substations, building the new Falls (FLS) substation, and making upgrades to the existing West Sioux Falls (WSF) and Split Rock (SPK) substations. View project map (PDF)
The transmission upgrade includes wood and steel structures, and also replacing existing distribution along the corridor with new equipment to further enhance Xcel Energy’s system with greater safety and reliability.
The Sioux Falls Northern Loop Project was constructed to modernize Xcel Energy’s facilities in the Sioux Falls area and to provide needed capacity for expected growth. The conversion will increase the power carrying capability of the corridor without need for any additional right of way. The new Falls Substation is replacing the Sioux Falls substation along Weber Avenue that was constructed in 1924.
This is the first step in repowering the City of Sioux Falls from 69 kV to 115 kV. Xcel Energy plans to pursue another project called Sioux Falls “Southern Loop” and perform the equivalent upgrades to 115 kV in the future. This project is expected to begin in 2020.