U.S. Fish & Wildlife ServiceThis feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data (HIFLD), depicts electric power transmission lines in the United States. Per HIFLD , "Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available." Data downloaded: 1/2/2023 Data source: Transmission Lines Data modification: none For more info rmation: Electricity Explained Support documentation: Transmission LinesArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/a1dd8f589ab448cd8f07d29ed219f63d_0engU.S. Fish and Wildlife Service Open DataPublicUS Electric Power Transmission Lines [United States]Web servicesUnited StatesLast Modified: 2025-11-07