Spain, Portugal restore electricity supply after outage

Power had almost fully returned to Spain early Tuesday morning as many questions remained about what caused one of Europe’s most severe blackouts that grounded flights, paralyzed metro systems, disrupted mobile communications and shut down ATMs across Spain and Portugal.

By 6:30 a.m., more than 99% of energy demand in Spain had been restored, the country’s electricity operator Red Eléctrica said.

Power had gradually returned to…