Major power outages across large areas of Spain and Portugal, as well as parts of southern France, knocked out traffic lights and disrupted public transportation and airport operations on Monday.

Parts of Spain, Portugal and southern France were plunged into darkness on Monday by a massive power outage. The lights are coming back on for some, but the cause of the outage remains unclear.

Grid operators report that a large blackout that affected portions of southern France, Portugal, and Spain on Monday left millions without power and disrupted communications and transportation ...

Power was almost entirely restored by Tuesday in Spain and Portugal, as well as in southern France, where households in the Basque region were affected. Spain’s top security and defense ...