Passengers react as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti) ...

The sweeping power outage that hit Spain and Portugal this week has raised questions about the electricity grid in a region not normally known for blackouts.

Passengers crowd the train accesses at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. Credit: AP/Emilio Morenatti What don't we know?

Passengers crowd the train accesses at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti) ...

Passengers react as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti) What should I do if the power goes down?

Here’s what to know: Passengers crowd the train accesses at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti) What happened?

Passengers sleep and sit on the ground as they wait for news of train departures, at Sants train station in Barcelona, Spain, on April 29. Emilio Morenatti/Associated Press ...

Passengers react as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025.

Pic: Reuters People gather outside Barcelona-Sants train station during a power outage. Pic: Reuters Blackouts in Spain and Portugal: Follow latest updates ...

Paquita Gonzalez cries as she waits for news of train departures, after spending the whole night at the station Sants station in Barcelona, Spain, Tuesday, April 29, 2025.

Passengers crowd the train accesses at Sants train station in Barcelona, Spain, April 29, 2025 - Credit AP Photo/Emilio Morenatti ...