BREAKING:WHAT WE KNOW ABOUT THE POWER OUTAGES IN SPAIN AND PORTUGAL

Millions on the Iberian Peninsula were left without power for hours on Monday afternoon into the evening
Traffic lights went dark at busy intersections. Trains stopped in the middle of a workday. And long lines formed at A.T.M.s and grocery stores, where credit card readers stopped working.

Widespread power outages upended life for millions across Spain and Portugal (and briefly, parts of France) on Monday, leading to questions about what caused the disruptions and when the lights would return.

Here’s what we know.