Rebuilding Project for 138 kV Infrastructure Improvements – Longview Heights to Marshall Project

Project addresses potential overload of 69 kV line during outages of interconnecting lines


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Longview Heights to Marshall Project
near Longview Texas
Client: American Electric Power

Sargent & Lundy EPC Joint Venture with EC Source Services

  • Public Outreach
  • Engineering and Design /Procurement
  • Construction, Testing, and Commissioning

Project Description:

The Longview Heights to Marshall Project near Longview, Tex., is being implemented to address potential overload of the existing 69-kV line during outages of interconnecting lines.

The overload issue will be resolved by rebuilding the transmission line from the Longview Heights substation to the Marshall substation.

  • Modifications at two substations (Longview Heights and Marshall)
  • Rebuilding 18 miles of 69kV line to 138kV
  • Distribution underbuild

The execution of this project was performed as a Joint Venture entity called ECSL.  Sargent & Lundy is providing the project management, public outreach support, procurement, and engineering & design for these projects. EC Source is providing the construction services.

The engineering work began in March 2016.  Construction started in October 2016 and complete March 2018.

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