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Portugal's REN says no sign blackout caused by cyberattack

Published by Global Banking & Finance Review

Posted on April 28, 2025

1 min read

· Last updated: January 24, 2026

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Portugal's REN says no sign blackout caused by cyberattack
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Portugal's REN Probes Causes of Recent Power Outage

LISBON (Reuters) -Portuguese grid operator REN said on Monday it had "no information" that the mass power outages that hit the Iberian Peninsula were caused by a cyberattack.

REN board member Joao Conceicao told reporters the operator did not rule out that the blackout was due to a "very large oscillation in the electrical voltages, first in the Spanish system, which then spread to the Portuguese system".

"There could be a thousand and one causes, it's premature to assess the cause," he said, adding that REN was in permanent contact with Spain.

Conceicao said REN hoped to reestablish the power supply in the country's second-largest city, Porto, within the next two hours and within five or six hours in the capital, Lisbon.

"If it were up to REN, the country would wake up tomorrow with electricity, but unfortunately it's not just REN that counts," he said.

(Reporting by Sergio Goncalves and Catarina Demony; Writing by David Latona; Editing by Inti Landauro and Sandra Maler)

Key Takeaways

  • REN reports no cyberattack in recent power outage.
  • Electrical oscillation in Spanish system affected Portugal.
  • Power restoration expected in Porto and Lisbon soon.
  • REN collaborates with Spain to determine the cause.
  • Full power restoration timeline remains uncertain.

Frequently Asked Questions

What is the main topic?
The article discusses the recent power outage in Portugal and REN's investigation into its causes.
Was the power outage caused by a cyberattack?
REN reports having no information suggesting a cyberattack caused the outage.
How is REN addressing the power outage?
REN is working with Spain to determine the cause and restore power in affected areas.

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