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Comprising geospatial data on electric power transmission lines, including underground lines where available. It was created by Oak Ridge National Laboratory for the Homeland Infrastructure Foundation Level Database (HIFLD) and the energy modeling community. The data includes lines operating at voltages from 69 kV to 765 kV.
The original HIFLD Open GIS data repository was deactivated on August 26, 2025; this dataset is an archive. Users should verify the license terms and intended use cases, as the data is for homeland infrastructure and emergency response.