South Australia’s grid has the highest rate of solar penetration in the world, with over 2 GW serving only 1.8 million citizens, and each summer, which Australia is currently entering, there is a longer string of middays through which over 100% of grid demand is met by solar. The excess has to be exported to other states, stored in batteries or curtailed. Transmission lines connecting this region to other Australia states are long, therefore expensive and have limited capacity. On Saturday 12th November thunderstorms again disrupted one of those thin connections, with the 650 MW Heywood interconnector to the more populated state of Victoria disabled. Extensive parts of the state’s grid were also disabled with 100 kilometer and hour winds…