There are continuous outages from equipment failure or needed upgrades. There is a lot of equipment. Just as there are vehicles failing every minute that need repair or maintenance. This is different from inadequate supply. 19 years since, not every year.
You can talk about related issues all day and still it had been 19 years since generating capacity was inadequate. And actually there was adequate supply until a natural gas generator when off line due the peak demand day last summer. If that plant kept running that day CA would have exceeded the historical maximum demand.
I was on CAISO monitoring that day and watched it unfold.
Could the grid in CA be better? Yes. They are working on it every day. Not a static situation.
