Yep, instead you hear about Tesla Walls (the big ones) storing power. And how they can build a mega-plex of them. And no one mentions that one LiIon battery goes critical, and the whole thing melts to the center of the earth.

In the desert, the "rivers" flow during the rain, and they are at the lowest point. Collect water there. Pump it up to the top of the mountain next to it. Easy peasy, and nothing to go boom.