today is a fine windy day in SA and we are currently running on ~80% renewables with some gas as a standby. The graph shows the huge price advantage of renewables - this is cheap power and something to look forward to more often in future. It also shows one of the downfalls of renewables in that overproduction penalises the producers, since there is currently nowhere to store the excess (literally) for a rainy day.
The pumped hydro system (and to a lesser extent the battery) noted in the first post will go part way towards solving such problems in 2020 and beyond - it won't smooth out supply/demand in less beneficial conditions this summer, but it is another step in the right direction. We have just spent a long time under the illusion that a market mechanism was a substitute for policy - industry now seems to be finding ways to bypass the resulting logjam and get us back on the most cost effective track - thankfully.
https://www.aemo.com.au/Electricity/...Data-dashboard