Analysis reveals 33-70% drop in Internet traffic at Iberian IXPs following power outage, suggesting infrastructure resilience in core networks.
On April 28th, 2025, a major power outage caused a disruption of electric service across Spain and Portugal, lasting about ten hours in most regions and even longer in some areas. We analyze the impact of the power outage, showing how it led to a near-instantaneous 33–70% drop in traffic at 4 major Iberian IXPs, while core infrastructure remained largely functional. We show that the Internet was impacted by a second event: a partial outage in a data center that resulted in a second drop of traffic and BGP sessions.
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Hohlfeld et al. (2026) studied this question.
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