alt Hacker NewsIf they're in a rural / industrial area setting it could quite literally be a fire break around the battery area (bare dirt and no overhanging trees).
Fire control in Australia is first and foremost about limiting spread - the bush in Australia goes off if it catches hard.
"Mini" pumped hydro is a thing here (in places): https://www.abc.net.au/news/2024-12-01/australian-first-mini...
'Is a thing' - obviously, stalled due to red tape. As an immigrant to Australia I am repeatedly amazed at how long anything involving the the government takes.