Electricity is pulsing through Spain and Portugal again after a massive outage knocked out power in both countries on Monday. So too are questions.

A widespread power outage hit Spain and Portugal, affecting millions of people who live across Europe's Iberian Peninsula.

Spanish Prime Minister Pedro Sánchez says “no hypothesis is being ruled out” as he vowed to investigate and uncover the cause behind the massive blackout that gripped the entire Iberian Peninsula on Monday.