Tesla hornsdale power reserve has saved south australia already 112 million <br>It can react as a frequency control system <br>Has been used twice recently to stabilise the grid in south australia from losing high voltage power lines from rest of east coast of australia <br>Absorbs excess electricity when frequency goes too high above 50hz and outputs when it is below 50hz <br>High voltage powerlines from victoria got blown over in big storm recently and south austraila was islanded from rest of east coast grid