It seems like we have endless ways to store energy at grid scale but we don't employ them because coal/natural gas is "cheaper" than storage, and likely will be

It seems like we have endless ways to store energy at grid scale but we don't employ them because coal/natural gas is "cheaper" than storage, and likely will be until an industry for grid-scale storage starts grinding down costs (as opposed to piggybacking off of something maximized for power/weight like li-ion).