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Frequently Asked Questions About AEP Transmission Line Project

Need for Project

The CPS Energy Facility General Routing/Siting Process

The Environment

Selecting A Location

Easement Planning

Transmission Structures

How to Contact CPS Energy


Need for Project

1. Why is this project needed?

 To address the reliability of electric service in the area west and southwest of San  Antonio, extending to the border towns of Del Rio, Eagle Pass, and Laredo, the Electric Reliability Council of Texas (ERCOT) recommended several transmission improvements.  These improvements will relieve overloading and under-voltage conditions that exist on the transmission system. These improvements will also improve the power transfer capability of the transmission system from generation located south and east of San Antonio to the high load growth areas along the border.

One of the improvements recommended by ERCOT is the construction of a new 138 kV line from the American Electric Power Texas Central Company (AEP TCC) Uvalde substation to the CPS Energy system (either the Castroville substation or the Texas Research substation). Specifically, this transmission line is needed to address several single contingency events (transmission facility outages) that result in overloads to five transmission facilities.  These facilities are the San Miguel 345/138 kV autotransformer, and the San Miguel bus tie, the Medina Electric Cooperative (MEC) Moore to MEC Downie 138 kV transmission line, the MEC Hondo Creek 138/69 kV autotransformer, and the MEC Pearson 138/69 kV autotransformer. These overloads and under-voltage conditions place electric customers in the area at considerable risk of losing electric service.  These risks are in violation of both ERCOT and North American Electric Reliability Council (NERC) transmission reliability requirements. Therefore, all electric service customers west and southwest of San Antonio to and including the border towns of Del Rio, Eagle Pass, and Laredo benefit from the electric service reliability improvement provided by this transmission line.

The CPS Energy Facility General Routing/Siting Process

1. How does CPS Energy consider routes for transmission lines?

In order to site new facilities such as substations or transmission lines, CPS Energy follows the CPS Energy “Facility General Routing/Siting Process.”  Once the need for the project is established, a study area is defined.  To identify potential routes within the study area, many factors are considered during the data-gathering phase, including feedback from people in the affected communities.  The area is studied using recent aerial photos and field investigations, and federal, state, and local agencies are contacted for information.

Natural terrain, environmental constraints, land use, cultural and human resources, existing easements, and engineering factors are considered when identifying possible line segments that might be used to formulate potential routes.  Many line segments may be examined and modified or eliminated due to one or more factors before final routes are selected.  As the public input process continues, line segments may be modified or eliminated, or new segments may be added.  This process will lead CPS Energy to develop and focus efforts on a few potential routes and, ultimately, identify a preferred route.

CPS Energy understands that property owners often do not want some of their property used for public infrastructure, so the Routing/Siting Process is designed to help CPS Energy identify a route that would have as little impact on the human and natural environments as reasonably possible.

The Environment

Selecting A Location

Easement Planning

Transmission Structures

How to Contact CPS Energy