> I guess if electric cars make sense then this also makes sense for transporting energy?

I don't see how that follows. The point of a electric car isn't to transport the electricity, it's to transport matter. There's no shortcut here: the only realistic way (short of Star Trek transporter beams) we can get the cargo from point A to point B is by physically moving it.

In contrast, we already have other ways to transport energy which work quite well. It's hard to see how this absurd concept could possibly be competitive with them.