Access comprehensive data on electric power transmission lines in San Diego County, California, specifically tailored for GIS professionals. This dataset encompasses a wealth of details on six overhead AC transmission lines currently in service, with voltage classes ranging from under 100 to 500 kV. Key attributes include owner information, voltage specifications, and specific substation connections such as Suncrest to Imperial Valley, and El Centro to Coachella Valley. Each entry is methodically validated through imagery and other sources as of the latest updates from 2017 to 2019. This precise data supports extensive spatial analysis and infrastructure management for efficient project planning and development in the energy sector.