Post actualizado el día September 27, 2026 by DeiviSanzPlay
Have you ever wondered what would happen if, suddenly, everything went dark? On April 28, 2025, millions of people in Spain and Portugal experienced that unsettling event. Within seconds, the Red Eléctrica, the backbone of our supply energy, collapsed, leaving the country in darkness. This unprecedented event forces us to reflect on how a national electrical grid really works and what vulnerabilities may lurk in the shadows.
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Red Eléctrica de España (REE) is responsible for guaranteeing the electrical supply throughout the entire territory. Its work consists of coordinating the generation, transmission, and distribution of electricity, ensuring that energy reaches our homes in an efficient and safe manner. However, the recent blackout showed that even such robust systems can fail.
According to preliminary reports, half an hour before the collapse, two periods of power and frequency oscillations were detected on the European grid. Although at that moment the electrical variables were within the normal range, a series of disconnections in southern Spain caused a frequency drop to 48 Hz, triggering the blackout.
This incident highlights the importance of the stability of the Spanish electrical system. Even though Spain is a leader in renewable energies, with 56% of electricity generated from clean sources in 2024, the lack of rapid response capacity revealed vulnerabilities in the system. During the blackout, diesel generators were used and energy assistance was requested from Morocco and France to restore critical infrastructure.
- Red Eléctrica de España (REE)
- Electric System Report
- Ministry for the Ecological Transition and the Demographic Challenge
- I-DE Smart Electrical Grids
Electrical interconnection with Europe is vital to guarantee the security of supply. However, during the blackout, the lines between France and Spain were disconnected, collapsing the Iberian system. This temporary isolation prevented the crisis from spreading to the rest of the continent, but it also left the Peninsula in a vulnerable situation.
In this context, it is essential to understand how electrical energy generation in Spain is managed. The Spanish electrical system has an installed capacity exceeding 130,000 megawatts (MW), distributed across more than 44,000 kilometers of high-voltage lines. This infrastructure makes it possible to supply more than 47 million citizens, but it also requires precise coordination to avoid imbalances.
Managing electrical demand is another crucial aspect. REE publishes updated charts that reflect the system’s production, forecast demand, and scheduled demand. This data makes it possible to adjust generation in real time, avoiding overloads or deficits that could compromise the stability of the system.
Furthermore, the energy transition in Spain toward renewable sources poses new challenges. Although solar and wind energy are essential for reducing carbon emissions, their intermittent nature requires efficient storage and backup systems. The integration of technologies such as smart electrical grids can improve the ability to respond to fluctuations in generation and demand.
The recent blackout has also highlighted the need to strengthen national energy security. The Audiencia Nacional has opened an investigation to determine whether the incident could have been an act of cyber sabotage, although REE rules out a cyberattack and points to a drop in solar generation as the main cause.
In short, the blackout of April 28 reminds us that, although we have one of the most advanced electrical grids in Europe, we are not exempt from risks. The combination of robust infrastructure, efficient management, and strategic planning is essential to guarantee a safe and sustainable electrical supply. The Red Eléctrica is the heart of our energy system, and its proper functioning is vital for the well-being of everyone.
