https://reneweconomy.com.au/tesla-big-battery-recoups-cost-of-construction-in-little-over-two-years-25265/

That's awesome, but seemed unbelievable

QuoteThe huge revenue boost from battery storage was the result of unusual – and likely unrepeatable – conditions that occurred when a tornado tore down the main transmission link between Victoria and South Australia in late January.

And now I see. Still pretty cool.