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Technological advances are transforming the U.S. power grid, enabling more electricity to travel longer distances with greater efficiency. High-voltage transmission lines, operating at either AC or DC, are key to delivering power from generation sites to consumers while minimizing energy losses. High-Voltage Direct Current (HVDC) systems, in particular, are increasingly used for long-distance, subsea, and inter-regional transmission due to lower losses and the ability to connect asynchronous grids.