Project Highlights
- Modifications at two substations (Longview Heights and Marshall).
- Rebuilding 18 miles of 69kV line to 138kV.
- Distribution underbuild.
Project Description
The Longview Heights to Marshall Project near Longview, Tex., was implemented to address potential overload of the existing 69-kV line during outages of interconnecting lines.
Sargent & Lundy and EC Source Services (ECSL) served in a joint venture to provide project management, public outreach support, procurement, and engineering & design for these projects. EC Source is provided the construction services.
The overload issue will be resolved by rebuilding the transmission line from the Longview Heights substation to the Marshall substation.

Read more about our grid services.
For information about EC Source, go to ecsourceservices.com.
For information about American Electric Power, go to www.aep.com.
Additional information on the infrastructure program projects:
69kV & 138kV Infrastructure Improvement Projects in Six States: Project Profile