But on the other hand, reasonable grid planning is done a decade ahead, more for some equipment. Money spent in a hurry is likely to be wasted in that business.
Storage to optimize grid (not production) cost is neither efficient nor resilient as far as I know.
Also having a peaker plant solves production peaks, not transmission limits. And nobody builds a second peaker at the other end of a line to save on grid costs. Redispatching is a thing, but it is a small optimization, not a solution to an underdeveloped grid.