Re: Extinguishers...
IMO grid-scale storage is a dead-end anyway; it's only being pushed to try and paper over the problem of renewal intermittency.
Could we call it "solar and wind intermittency". If we rebuilt every waterwheel in the country and added new ones on wiers then the energy produced would only be intermittent on the occasions that the water in the rivers stopped flowing.
Precisely why everything was pinned on wind and solar i'll never know; other than it's cheap and favours large land owners.