Gain insight into the network of electric power transmission lines in Duval County, Texas, with our focused dataset aimed at supporting GIS projects in regional electric infrastructure planning and analysis. This dataset offers detailed information on three overhead AC transmission lines, which include attributes such as the status of the line, voltage level, and ownership. Each features' data is derived from high-quality imagery and OpenStreetMap sources, ensuring reliable metrics for professional use. With lines ranging in voltage from 69 to 138 kV and classifications between "under 100" to "100-161" VOLT_CLASS, the dataset caters to varied analysis needs. Whether mapping for service status, infrastructure ownership, or specific electric control areas catered by major providers like AEP Texas Central Co., this dataset serves as an essential resource for electric power transmission data in Duval County.