I may be wrong in the interpretation, but LCOE would seem to apply only to the actual capacity, and not the grid‘s entire throughput. Yet batteries would only

I may be wrong in the interpretation, but LCOE would seem to apply only to the actual capacity, and not the grid‘s entire throughput. Yet batteries would only be needed for a fraction of the installed power, to adjust for fluctuations in supply and demand. Most power would never see the battery in such a grid. And, of course, batteries are only one of multiple strategies to get supply and demand to equalize. Smart consumers is probably the most underdeveloped now, from cars that would charging (and possibly even discharge into the grid if your schedule allows), washing machines picking the best times when possible, or cooling and heating working with their respective reservoirs.