What gives you that impression? Unless you're looking at the pre-9/11 grid powered by Enron™, rolling blackouts aren't a big deal in California. I think since 2001 there was a single 2 day event limited to certain regions, I don't know anyone personally who lost electricity due to rolling blackouts.
The CA grid has also scaled up battery storage surprisingly quickly. A few years ago it was in the single digit mWh, not really a meaningful fraction of the grid. Now it's measured in gigawatt-hours.
You are right. Not sure where I read it but it was clearly wrong.
Still, I think the grid is very vulnerable with that amount of weather-based energy. If there can be enough batteries to sink all that power generated and have it during evening til morning then that's great.
Perhaps that _can_ work in California, I really don't know what an acceptable level of storage would be. That is, how many days worth of battery power you'd want in case of bad weather conditions.
The CA grid has also scaled up battery storage surprisingly quickly. A few years ago it was in the single digit mWh, not really a meaningful fraction of the grid. Now it's measured in gigawatt-hours.