Spain’s grid operator offered the most detailed account yet of the events that led to a blackout that spilled over to Portugal, describing a series of disruptions over just a few seconds that plunged the country into darkness for hours.
The information still leaves major questions about the root of the faults unanswered, but it shows how stress on the network — which has since been restored — makes it vulnerable and will need investment to become more resilient.
“These are not definitive conclusions, we don’t have the complete information,” Eduardo Prieto, director of services