Sonoma County, California, offers valuable insights for GIS professionals with its US Electric Power Transmission Lines dataset. This dataset provides detailed information on overhead AC transmission lines, indicating their operational status, voltage class, and specific substation connections from Lakeville to Sobrante and Hopland to Fulton. It includes essential attributes such as ownership, source validation methods, and the length of each line segment, captured in the dataset since 2017. Professionals in the field of electric bulk power transmission and control will find this dataset particularly useful for regional planning and infrastructure development analysis.