Nixa Transmission Reliability Upgrades

Nixa, Missouri

The Southwest Power Pool (SPP) identified a regional reliability issue caused by a line-capacity limitation on the GridLiance transmission facilities in the City of Nixa resulting from the retirement of a coal plant. To address this reliability issue, SPP directed GridLiance to construct an upgrade to address the reliability concern and to ensure that there will not be a disruption in service to residents and businesses.

To improve reliability on the system, GridLiance rebuilt 1.25 miles of 69 kV transmission line between the GridLiance Espy Substation and the GridLiance Downtown Substation. This required construction in downtown Nixa along a major highway — and during the holiday season. GridLiance coordinated with city, county, and state highway agencies to ensure holiday traffic was not disrupted and worked to ensure the lights stayed on for retail businesses as construction proceeded.

The successful upgrades were completed within a span of three months in the fall/winter of 2019.

Project Benefits


  • Improves reliability

  • Improves resilience to severe weather

Key Project Highlights:

  •       1.25 miles of 69 kV transmission line through downtown Nixa, including underground distribution