The April 2025 Iberian Peninsula Blackout
A major power outage can quickly become a much broader continuity challenge.
A practitioner-focused examination of how widespread power disruption affected continuity, infrastructure dependencies, operational adaptation, and recovery across Spain and Portugal.
Research status
We are preparing a practitioner case study examining the April 28, 2025 Iberian Peninsula blackout and its cross-sector continuity impacts. The work draws on official investigations, government and regulator records, sector reports, and academic literature, and is being developed with the goal of peer-reviewed publication.
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WHY THIS CASE MATTERS
Widespread power outages are rarely confined to the electric system. Critical functions also depend on communications, digital systems, transportation, fuel, payment systems, and other infrastructure. Disruption to those dependencies can affect continuity even where local backup power exists. The April 2025 Iberian Peninsula blackout offers a useful case for examining these relationships across multiple community lifelines.
WHAT THE EVIDENCE IS SHOWING
Backup power is only one layer.
Selected critical functions continued, while communications, digital systems, access, and supporting processes could remain impaired.
Dependencies compound.
Telecommunications and digital disruption affected continuity across multiple infrastructure-dependent functions.
Restoration is a process.
Electrical restoration, functional restoration, and normalization can occur on different timelines.
KEY EXAMPLES
These represent different sector-specific measures and should not be interpreted as directly comparable performance metrics.
ONE EVENT. THREE RECOVERY CLOCKS.
Electrical restoration
When electrical supply or system capability returns.
Functional restoration
When the essential service can perform its mission again.
Normalization
When routine service, access, throughput, and supporting processes return to normal.
PLANNING CONSIDERATIONS FOR EMERGENCY MANAGERS
- Has your organization identified which functions must continue during a prolonged outage, and the minimum level of service each requires?
- Has your organization identified what backup power supports, how long it can sustain operations, and what remains dependent on fuel, communications, digital systems, or other services?
- Has your organization considered which critical supplies or resources may be consumed faster than expected, and how they would be replenished during a widespread disruption?
- Has your organization planned for sustained staffing challenges, including transportation, family responsibilities, fatigue, relief staffing, and employee support needs?
- Has your organization considered what happens if primary continuity strategies such as backup power, alternate facilities, or fuel resupply become unavailable or insufficient?
- Has your organization defined what full operational recovery looks like beyond restoration of electricity alone?
METHODOLOGY
The case study uses a structured documentary review of official investigations, government records, regulator records, operator and sector sources, academic literature, and selected professional material available through October 28, 2026.
power disruption → affected function/dependency → continuity capability or failure
→ operational adaptation → restoration → normalization
Missing elements are treated as evidence gaps rather than inferred. ENTSO-E’s final investigation is treated as the controlling source for technical causation.
WHERE THE EVIDENCE STOPS
Public evidence is uneven across sectors and countries. Some reports are publicly available only as summaries, and some operational records were not available. Successful response does not automatically demonstrate preparedness. Findings are limited to documented episodes and the strength of available evidence.
SOURCES & REFERENCES
Selected primary reports, regulator records, sector analyses, and research used to support the case study.
Electrical system investigation
Spain government response
Payments
Telecommunications
Rail
Healthcare and EMS
Relevant ministry, regional health, EMS, and academic sources.
Additional technical context
ABOUT THE AUTHORS
Rachel Porter
Rachel Porter is an emergency management leader specializing in critical infrastructure resilience, with nearly 20 years of experience across the public, private, and nonprofit sectors. Her work spans operational coordination, preparedness, response, continuity, incident management, exercises, and resilience strategy, with particular depth in electric utility and critical infrastructure environments.
She also contributes to industry resilience efforts through the North American Transmission Forum’s Resilience Practice Group Core Team. Rachel is an Arizona Master Emergency Manager and Certified Business Continuity Professional and is the founder of Leading Resilience, where she shares practical approaches to preparedness, leadership, and organizational resilience.
Kimberlee Battaglia
Kimberlee Battaglia brings extensive experience across emergency management, business continuity, incident response, medical service delivery, training, firefighter safety, and resilience planning. Her work has supported mission-critical energy and infrastructure operations, including conventional and emerging generation, transmission, distribution, and continuity of operations.
She has spent nearly two decades advancing emergency preparedness and resilience within the utility sector, with particular experience supporting generation and renewable energy operations. Kimberlee also founded Fire and Emergency Management Consulting Services (FEMCS), providing practical, evidence-based preparedness, response, and recovery support to public- and private-sector organizations.
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