Power in Spain is being gradually restored[1]. Speculations about this outage being the result of a cyberattack are exactly that: speculations. The fire in France that caused an outage on a 400kV power line seems to be unrelated. But again, we will have to wait for a postmortem to emerge and that will likely take at least a few days.
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What *seems* to have happened: The Holy Grid Frequency started to oscillate out of spec, leading to a de-coupling of the Iberian part from the European grid which in turn caused ripple effects that led to a big outage. Why the frequency ran away is as of yet unknown, a theory about atmospheric conditions goes around but is not supported by many experts in the field, AFAICS. #HackerTerrorCyberCyber is being ruled out as of now.
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