South Padre Island and Port Isabel Transmission Improvements Project

    AEP Texas representatives plan to prepare a power transmission system upgrade in the Port Isabel and South Padre Island area to better withstand adverse Gulf Coast weather through a $51 million rehabilitation program. The project includes a rebuild of about 12 miles of 138-kilovolt transmission line.

    The project also reduces the likelihood and duration of power outages, while supporting economic growth and the region’s crucial tourism sector.

    Crews plan to complete the project in 3 phases:

    • Phase 1: Upgrade the line between the Port Isabel and Causeway substations in Port Isabel.
    • Phase 2: Upgrade the line between the South Padre Island and Sunchase substations in South Padre Island.
    • Phase 3: Upgrade the line between the Causeway and Sunchase substations near the Queen Isabella Causeway.

    Project Updates

    AEP Texas representatives hosted a construction open house on Wednesday, October 9, 2019, at the South Padre Island Community Center from 5 p.m. to 7 p.m.

    Coates Field Service serves as AEP Texas' right-of-way representative on this project. Since last Fall, Coates right-of-way agents have been working with landowners to notify them of field activities. As the project moves forward, right-of-way agents are working with landowners along the line route to discuss necessary easements for the project.

    AEP Texas representatives urge landowners to please contact the right-of-way agent listed on the letter they may receive to discuss questions regarding possible easements or other project-related questions. AEP Texas and Coates representatives want to be good neighbors and help to answer any concerns that customers may have.

    AEP Texas hosted an informational come-and-go open house for area residents on Thursday, January 17, 2019, at the Port Isabel High School cafeteria in Port Isabel from 4 p.m. to 6:30 p.m.

    Construction on Phase 1 of the transmission project will be complete in Summer 2020, though additional work on distribution components may continue at select locations for several weeks.

    AEP Texas plans to begin work on Phase 2 of the project in Fall 2020.

    Project Releases


    Fact Sheet

    Construction FAQ



    Phase 1 Information

    • Typical Structure Height: 80 feet
    • Typical Distance Between Structures: 280 feet

    Phase 2 Information

    • Typical Structure Height: 110 feet
    • Typical Distance Between Structures: 700 feet

    *Exact structure, height and right-of-way may vary

    * The accompanying map depicts the project area. It should be noted that the map contained on this site is for information purposes only. AEP reserves the right to alter, change, or amend the map at any time without notice and AEP provides no warranty about the accuracy of content. Keep this in mind when reviewing this map. However, AEP will make all attempts to keep this map as accurate as possible. If you have any questions about the accuracy of the current map please Contact Us.