Cable run length doesn't really have anything to do with DC vs. AC, it's all about the voltage. Power losses are proportional to current squared, so for a given

Cable run length doesn't really have anything to do with DC vs. AC, it's all about the voltage. Power losses are proportional to current squared, so for a given power transmitted, they're proportional to the inverse square of the voltage. We're just used to power transmission being AC because with AC it's easier to switch large currents on and off, and easier to step voltage up/down.