Just 1.7 million people live in South Australia, which is a nice size to consider a test market for technology like this. Rural grids tend to be left behind, because the ratio of required hardware and infrastructure is still so high per consumer -- much more-so than in a big city, where the same short length of wiring could power thousands of homes. And building a facility that acts as a battery can help smooth out the natural ebbs and flows that come both from renewable energy technology and from the spread out, failure-prone nature of more rural grid sections. This smoothing has saved South Australians a ton of money, already much more than the $50 million cost that Tesla passed on to its Australian investor. The battery facility "reduced network costs by about $76 million in 2019," Bloomberg explains, "savings [Garth] Heron, [Neoen's head of development in Australia] said would be passed on to businesses and households in the state. The battery's introduction also slashed the cost to regulate South Australia's grid by 91 [percent], bringing it in line with other regions in the nation."
Read more of this story at Slashdot.