Well, that's alright then
Genex Power, owner of the 50 MW / 100 MWh Bouldercombe battery which caught fire in Queensland on September 26, says its preliminary root cause analysis found the fault occurred at the grid side of the Tesla Megapack battery unit.
",,, the fault initially occurred on the AC side, saying the fault then propagated to the battery modules within the Megapack."
https://www.pv-magazine-australia.com/2023/11/07/queensland-bouldercombe-battery-fire-ignited-on-grid-side-not-within-megapack-analysis-finds/