I read that as well... good spot being left out of this article. Here is the link: https://www.wired.com/2016/05/forget-elons-batteries-fix-grid-rock-filled-tra

I read that as well... good spot being left out of this article. Here is the link: https://www.wired.com/2016/05/forget-elons-batteries-fix-grid-rock-filled-train-hill/ https://www.wired.com/2016/05/forget-elons-batteries-fix-gri...