To add, grid-scale batteries do make sense if you have a ton of cheap land. Most facilities that need backup power aren’t in areas with lots of cheap available land for battery installations.

The kind of backup power needs that hospitals, data centers, and other critical facilities have (multiple MWH per hour at minimum for large facilities) and the durations they need to operate for, combined with the land prices in the areas where they are situated, make battery backup for critical power needs uneconomical due to the space needed with current battery energy density.