The "DC can't be transmitted long distances" myth seems to date back to a time when solid-state (read: efficient) DC-DC converters didn't exist. In Edison's tim

The "DC can't be transmitted long distances" myth seems to date back to a time when solid-state (read: efficient) DC-DC converters didn't exist. In Edison's time, the entire DC grid had to operate at the same voltage, whereas an AC grid could utilize transformers to step the voltage up for transmission. But if a DC "transformer" had existed at the time, DC grids would not have had that limitation. The physics (capacitance, inductance, skin effect) dictate that for a given voltage and distance, DC is always more efficient than AC transmission.