This web page provides GIS professionals targeting Contra Costa County, California, with access to a specialized dataset featuring US Electric Power Transmission Lines. With around six detailed entries, users can access comprehensive information about infrastructures such as the overhead AC transmission lines in service, marked by their voltage classes ranging from 100 to 500. These records detail ownership—entities like Pacific Gas & Electric Company and Sacramento Municipal Utility District—along with connections between substations, such as Tracy to Olinda and Brighton to Grand Island. The online dataset is maintained up-to-date with sources from reputable organizations including the Western Electricity Coordinating Council and California Independent System Operator, ensuring high reliability through imagery and other validation methods. Ideal for those in the field of electric bulk power transmission and control, these data entries support detailed geographic analyses and infrastructure planning in the region.