A recent report reveals that a significant power outage that affected both Spain and Portugal was the most severe blackout experienced in Europe in the past two decades and the first ever attributed to overvoltage conditions.
According to Damian Cortinas, head of the electricity grid operators association Entso-e, this blackout was unprecedented since it originated from an overvoltage incident—an electrical condition wherein the voltage exceeds safe levels. Cortinas stated, This is new territory, while emphasizing that the primary focus was not to assign blame.
The incident, which occurred in April, caused significant disruption, plunging large areas into darkness for almost an entire day and disrupting internet, telephone services, and transport operations.
During the event, cascading overvoltages—an increase in supply voltage above normal ranges—were identified as the underlying cause, which could stem from surges due to overproduction, lightning strikes, or inadequate protective equipment. Unfortunately, despite the activation of automatic safety protocols, they were insufficient to prevent the blackout.
The report has sparked ongoing investigations by the Spanish government and energy regulators, who believe it corroborates their findings that both Red Eléctrica, the national grid operator, and various private firms shared fault in the disruption. Red Eléctrica has countered the allegations by attributing the outage to failures at some coal, gas, and nuclear plants in maintaining voltage stability.
The Entso-e report indicated challenges in acquiring complete data, which made the investigation complex. A more detailed report is expected early next year, intending to analyze the causes of the overvoltage incident.
This blackout triggered a political discourse on Spain's energy model, with critics linking the growing reliance on renewable energy amidst a decline in nuclear energy capacity to the incident’s causes. However, the current administration has dismissed these claims, maintaining that the blackout's causes were still being analyzed.
The incident affected many aspects of daily life in Spain and Portugal, including halting events like the Madrid Open Tennis and prompting hospitals to enact emergency measures. Buildings were left in darkness, transport systems were shut down, and emergency services responded to numerous incidents involving people trapped in elevators.
