For some in Australia net-zero has already arrived, in South Australia, at a time when energy demand is actually higher due to increased demand for heating. South Australia had 100% solar generation for its 1.7 million population, form 288,000 active rooftop solar installations, generating 992 MW, with another 313 MW coming from utility-scale solar plants. However this only lasted for an hour at midday, before gas and wind had to step in, instead of storing their energy in battery installations for transmission to neighboring states. In 2015 the Australian Energy Market Operator (AEMO) predicted that rooftop solar would occasionally reduce grid demand to zero by 2023 in the state, and since a few hundred MW came from utility-scale solar this…