I'm surprised there still isn't any information.

Agreed

The limited info I have seen is "officials" saying it happen outside the country. (aka: don't blame us).

https://www.npr.org/2025/04/28/g-s1-63089/power-outage-spain-portugal-france

Portugal's government said the incident appeared to stem from problems outside the country, an official told national news agency Lusa.

Side note: I wonder how much Hash rate might go down by during the blackout.