Overview
North Calliham Substation is an operational electrical substation in Texas, United States, operated by South Texas Electric Cooperative with a voltage level of 69 kV.
North Calliham Substation is an operational electrical substation located in Texas, United States. It is owned and operated by South Texas Electric Cooperative, a member-owned utility serving rural areas. The substation operates at a voltage of 69 kV, which is typical for sub-transmission or distribution-level infrastructure in the region. The facility operates under the regulatory framework of the North American Electric Reliability Corporation (NERC) and the Federal Energy Regulatory Commission (FERC), which set reliability standards for the bulk power system. As a substation in the Electric Reliability Council of Texas (ERCOT) region, it is subject to ERCOT's grid reliability and operational protocols. The 69 kV voltage level indicates it likely serves as a distribution substation, stepping down power for local communities. This substation plays a key role in delivering electricity to rural communities in south Texas, supporting agricultural and residential loads. Its location near the town of Calliham ensures grid stability and power quality for the area. The facility's operational status and cooperative ownership reflect the typical structure of rural electric infrastructure in the United States.
Environmental context
The substation is located in a rural area of south Texas, characterized by a semi-arid climate with hot summers and mild winters. The surrounding landscape is primarily agricultural, with ranching and farming activities. Electrical infrastructure in such settings must be designed to withstand extreme weather events, including heatwaves and occasional hurricanes. The 69 kV voltage level is appropriate for distribution in low-density areas, minimizing environmental footprint while ensuring reliable power supply.
Frequently asked questions
North Calliham Substation is located in Texas, United States, near the town of Calliham. Its coordinates are approximately 28.5436 N, -98.3412 W.
North Calliham Substation operates at a voltage of 69 kV (69,000 volts), which is typical for sub-transmission or distribution-level substations in rural areas.
The substation is owned and operated by South Texas Electric Cooperative, a member-owned utility providing electricity to rural communities in south Texas.
As part of the US bulk power system, North Calliham Substation must comply with NERC reliability standards and FERC regulations. It also operates under ERCOT's grid protocols for the Texas interconnection.
A 69 kV substation typically steps down transmission-level voltage (e.g., 138 kV or higher) to distribution voltage for local use. It serves as a critical node for delivering power to residential, commercial, and agricultural customers.