Good enough for what? I've read the article. It's speculating that solar could be the culprit as it was the main source of energy at that time, but the grid operator couldn’t say what exactly failed, only that they had "two separate losses of power generation in southwestern Spain, a second and a half a part".

If you look at the generation stats[0][1], everything from nuclear to gas to solar dropped. And it was solar and wind that kept producing most of the energy for hours after the failure.

If renewables were the cause of this blackout, then fine, but that's not what the WSJ article says. The guy who wrote the tweet you linked to was blaming renewables 2 or 3 hours after it had happened and the tweet contained wrong information, as pointed out by a different comment here. To me, it's not a good source.

Just to be clear, if renewables were the main reason behind this blackout, then let's blame them and point out their weaknesses and see what we can do to mitigate them (batteries?). What we shouldn't do is jump to conclusions before we know what the heck happened.

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[0] https://i.imgur.com/J375gbQ.png

[1] https://transparency.entsoe.eu/generation/r2/actualGeneratio...

Except that's not true: an auto shutdown only occurs at 47.5 Hz, at least in Germany, some countries have the limit even lower: https://de.m.wikipedia.org/wiki/Unterfrequenz

Is that a reliable source? The guy started blaming this on renewables hours ago even though no one seems to know exactly what happened.

The guy is an American political journalist, his opinions here have exactly zero value to me.