[dreamcompiler]

> "DC power is significantly more energy efficient than AC power." -> the examples go on to specify end points for electrical energy but we already use DC there, AC is mainly used in transmission, so the claimed advantages of DC are irrelevant.

DC is more efficient for transmission too.

The reason the grid uses AC is that high voltage is always[1] more efficient for transmission than low voltage--regardless of whether you're talking about AC or DC--and in 1900 the only way to step voltages up or down was to use transformers, and transformers require AC. That's unfortunate because for a given voltage, it's more efficient to transmit it as DC than AC.

But today we have power electronics which can step DC voltages up or down, which means we are free to convert the grid to DC.

[1] The single exception is superconducting cables which can transmit low voltage power just as efficiently as high voltage power. But they are not yet cheap enough to be practical except over short distances.

[dhdc]

I fully agree with what you said about AC/DC, just want to point out that DC benefits superconductors as well since superconductors have critical current densities where they lose their super conductivity.