One year on from the major power outage that plunged Spain and Portugal into darkness for hours, the central question remains unresolved: who was responsible? While investigations continue, the consequences are already being felt — most notably in the form of higher electricity bills for consumers.
Spain Expat Press Editorial Team
A complex failure with no single cause
From the outset, official explanations have pointed to a “multifactorial” event. According to both the Spanish government and the European network ENTSO-E, the blackout was not triggered by a single failure, but by a combination of grid oscillations, voltage instability and rapid disconnections of power generation.
Described as an “unprecedented” incident in the past two decades, the event exposed underlying vulnerabilities in the electricity system. Yet despite detailed technical analyses, no single actor has been identified as responsible.
Investigations underway, but no clear accountability
Spain’s competition and energy regulator, the CNMC, has since opened more than 50 sanction proceedings. These include the system operator Red Eléctrica de España, as well as major energy companies such as Iberdrola, Endesa and Naturgy.
However, these cases remain at an early stage. Any potential penalties are likely to take years to materialise, with many expecting the matter to ultimately be settled in court. For now, accountability remains unclear.
Political scrutiny, limited clarity
Parallel parliamentary inquiries have done little to clarify the situation. Investigations in both the Senate and Congress have largely been marked by mutual accusations between government bodies, regulators and private companies.
While some political conclusions have pointed to regulatory shortcomings, the broader picture remains blurred. The debate has generated more noise than answers.
A stronger system — at a higher cost
What has changed, however, is the way Spain’s electricity system is now operated. In response to the blackout, a reinforced operational model has been introduced to reduce the risk of similar incidents.
At the same time, the growing share of renewable energy — while lowering wholesale electricity prices — introduces greater variability into the system. This requires more frequent balancing interventions and increased reliance on backup sources such as gas-fired power plants.
The result is clear:
greater system stability, but at a significantly higher cost.
Consumers footing the bill
The measures implemented by Red Eléctrica de España have already cost an estimated €666 million. These costs are not absorbed within the system — they are passed directly on to consumers through electricity bills.
Balancing and adjustment costs have risen sharply, particularly affecting households on Spain’s regulated tariff system.
One year on: the case remains open
Twelve months after the blackout, Spain’s electricity grid may be more resilient, but the fundamental issue remains unresolved.
No clear responsibility, ongoing investigations and rising costs — the 2025 blackout remains an open case. Its final outcome is unlikely to emerge from political debate or technical reports, but rather from lengthy legal proceedings still to come.
