I don't have any special sources, but since sodium-ion batteries are already being installed in BEVs and power grids, I guess we'll all find out how it's going

I don't have any special sources, but since sodium-ion batteries are already being installed in BEVs and power grids, I guess we'll all find out how it's going before long. No reason a power grid can't restrict their battery storage to 80% discharge, if necessary. It just means buying 20% more battery.