When has Australia ever experienced these rolling blackouts across states due to solar? The most recent substantial blackouts (2019 in victoria) were due to extreme heat causing the power stations to be unable to meet demand, plus some stations being offline [0]. This is totally unrelated to the uptake of solar which ameliorates peak demand for aircon power.
[0] https://www.abc.net.au/news/2019-01-26/victorian-blackouts-w...