Places with not many hills will of course prefer other storage media. Places with lots of hills will also prefer other storage media if they turn out to be che

Places with not many hills will of course prefer other storage media. Places with lots of hills will also prefer other storage media if they turn out to be cheaper. It is far from clear yet how costs will settle out. It is anyway not time yet to build more than just enough storage to shift the few hours from peak generation to peak use.