Access detailed spatial data on electric power transmission lines for Santa Clara County, California. This data set provides GIS professionals with information on six overhead, alternating current (AC) transmission lines that are currently in service. Each record details the voltage classification, ownership, substations from and to which the line runs (e.g., Coburn to Moss Landing, and Brokaw to Serra), as well as the length of each line measured in feet. The data, validated through imagery and other methods as of 2017 and 2018, supports the electric bulk power transmission and control sector, aiding in various GIS analyses and infrastructure management tasks. Whether planning expansions or monitoring existing infrastructure, this dataset serves as a valuable resource for those managing energy transmission networks within the region.