Hornsdale Power Reserve (2017)
Tesla installed a 100-megawatt lithium battery in South Australia, the largest grid battery in the world at the time, built in under 100 days after a state-wide blackout.
The battery sharply cut the region's grid stabilization costs and delivered a fast grid response that gas plants could not match.
It kicked off a global build-out of grid-scale lithium batteries that is now the default clean firming technology.
Like Hornsdale proved lithium batteries at scale, Mammoth Solar is the proof-of-scale test for zinc-based long-duration storage.
