So far we have no reliable battery technology for this scale of operation - from what I understand there is one pilot battery plant, and it went off due to overheating at least twice in the last five months.
Thanks! I didn't know about these events.
The B-777 Dreamliner experienced fires due to battery overheating. This was "solved" by packing the batteries in fireproof containers, so the flames don't spread. Doing the same on the ground is no big story. Accept one battery to burn from time to time, continue operation. And: who bozo put water sparklers over lithium batteries? Firefighters - first responders - engineers know that electric circuits demand foam or powder.
If these fires result from poor cooling, the technical answers are easy and well known. No nice news for the production as it implies deep changes in the design, but no need for years long research neither.
Home batteries by Tesla don't ignite, do they? Hint to a better design, probably better cooled because thinner. If Tesla can produce them at the same €/kWh, the answer is to assemble more of them instead of the big units.
How does the storage plant in Australia perform? Somehow I have in mind that it's bigger than the one in California.