Wikipedia has an article following this:

<https://en.wikipedia.org/wiki/2025_European_power_outage>

Confirmed by contacts on the ground in Spain and Portugal.

Not the best news source, but it’s the only one I’ve found so far. HN moderators, feel free to replace it later with a better one.

Supposedly also France is affected (unconfirmed)

I've heard from friends in France, Portugal and I am in Spain. I saw people are also mentioning parts of Italy.