Lorraine Williamson
Nearly a year after the huge power outage that hit Spain and Portugal, the Spanish government is stepping up pressure on electricity companies to make public what they know.
Energy Minister Sara Aagesen said on Monday that power firms should release all the information they hold about the blackout, arguing that transparency is needed because no company has yet been held responsible. Reuters reported that the request came during a Senate committee hearing, where Aagesen said the data submitted by companies had so far been anonymised.
Why is Spain asking power companies to release blackout data?
Because the political and public pressure has not gone away. The blackout on 28 April 2025 left parts of Spain and Portugal without electricity for up to 16 hours, disrupting transport, daily life, and business across the Iberian Peninsula. Aagesen now says the companies should make their information public so there is more clarity about what happened and who may have been responsible.
This is no longer just about voltage curves, grid management, and infrastructure resilience. It is about accountability.
The cause may be clearer, but blame still is not
Reuters says the government and grid operator have pointed to a voltage surge as the immediate cause of the blackout. But despite months of analysis, no company has yet been formally held accountable. A recent report by Spain’s energy watchdog CNMC also stopped short of assigning blame, even while recommending changes to reduce the risk of similar failures in the future.
That helps explain why the issue remains politically alive. The country has a technical explanation, or at least part of one, but still no definitive public answer on responsibility.
A growing row over transparency
Aagesen’s intervention matters because it widens the focus from what happened to who is willing to be open about it. Reuters reported that the information provided by companies to investigators has been anonymised, something the minister now wants to change.
That creates a broader question for Spain’s energy sector. If the blackout exposed weaknesses in the system, can the public really judge what went wrong while the corporate data remains hidden from view? That is an inference based on the minister’s demand for openness and the continued absence of accountability.
What happened after the blackout
The massive outage triggered several investigations and a long-running debate over how resilient Spain’s power system really is, especially as renewable generation grows and grid management becomes more complex. Reuters reported last week that the CNMC had recommended stronger supervision of voltage swings, more frequent inspections, and reinforced electricity links with France after the 2025 blackout.
Aagesen has also said the system is now more resilient and has expressed confidence that Spain can continue expanding renewable energy without risking another major nationwide outage.
Why this matters now
At one level, this is an energy-sector story. At another, it is about public trust. A blackout of that scale is not something people forget quickly, especially when it disrupted trains, lifts, businesses, and daily routines across two countries.
That is why the minister’s demand lands now with some force. Nearly a year on, Spain still does not have a clear public chain of accountability. And until that changes, the blackout will remain not just a past crisis, but an unresolved one.
EU scrutiny intensifies over Spain blackout as grid fragility exposed