Access specialized GIS data on electric power transmission lines in Defiance County, Ohio, tailored for professionals managing utility networks. This dataset includes comprehensive information on two overhead AC transmission lines that are currently in service, providing crucial details such as voltage levels, ownership, and method of validation. Notably, both lines operate within the voltage class of 100-161 and have been validated through imagery. Useful for professionals in electric bulk power transmission and control, this dataset sourced from OpenStreetMap and EIA delineates pivotal infrastructure data for effective mapping and analysis in GIS projects.