Cities and factories are always going to need the grid.
That’s untrue. See near the bottom of my post here:
The part about Mark Z. Jacobson - Energy Policy, for one… and please sprinkle other stuff from my post there and my other posts within that thread about the decentralization of power with loads of links, sources, etc.
Now, if you’re saying they are going to need the grid for a long time from now, I agree. But, eventually everything will be unchained from incredibly inefficient, centralized power down the road. Too far down the road because industry is currently able to overwhelm the Internet (and corporate media is a given) with loads of propaganda to protect their current infrastructure until it rots. But, eventually the information threshold will overtake them.