- Spain says ‘overvoltage’ caused major April power outage France 24
- Full-scale power failure that shut down Iberian peninsula had no single cause but was not cyber-attack, Spain says – as it happened The Guardian
- Spain says April blackout was caused by grid failures and poor planning, not a cyberattack CityNews Kitchener
- Spain’s Blackout Report Comes Up Short, With Much Still Unknown Bloomberg
- Blackout in Spain and Portugal caused by ‘voltage surge’ DW
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