Oh, I definitely agree. The cistern analogy with water would function the same way-- refilling from the public water supply as it was drawn upon. I assumed one

Oh, I definitely agree. The cistern analogy with water would function the same way-- refilling from the public water supply as it was drawn upon. I assumed one would disconnect from the public utility input to obscure usage patterns, "refilling" in bulk at a later time. (I did think the Powerwall was aimed at load-shifting, though, too.)