Ammon News - The cause of Spain and Portugal’s widespread blackouts remained a mystery on Tuesday, with some isolated disruption remaining after power was largely restored to both countries.

One of Europe’s most severe blackouts grounded flights, paralyzed metro systems, disrupted mobile communications and shut down ATMs across the Iberian Peninsula on Monday.

By 7 a.m. on Tuesday more than 99% of energy demand in Spain had been restored, the country’s electricity operator Red Eléctrica said. Portuguese grid operator REN said all 89 power substations were back online and power had been restored to all 6.4 million customers.

As life began to return to normal — with schools and offices reopening, traffic easing and public transport restarting — the authorities in Spain have yet to provide further explanations for what caused one of the most serious blackouts to ever take place in Europe. AP