The Largest Blackout in Europe – Spain Responds
In response to an unprecedented power system failure that on April 28, 2025, paralyzed nearly all of mainland Spain and a large part of Portugal, the government has announced a comprehensive reform package aimed at increasing the resilience of the national electricity grid. The new regulations, approved by royal decree, include enhanced oversight, accelerated investments in renewable energy and storage, as well as improved rules for voltage stability and overload management.
Key Findings of the Government Report
A government report published in early June revealed that the cause of the outage was insufficient voltage control capacity, which triggered a cascading reaction resulting in a widespread blackout. Although the system “had everything it needed to function properly,” the analysis nonetheless “allowed for the design of measures that will better protect us in the future.”
The report also pointed to operational failures by the grid operator — Red Eléctrica de España — which on the day of the incident reduced its ability to manage voltage fluctuations. Additionally, several unnamed energy companies improperly shut down their power plants, exacerbating the crisis.
Strengthened Oversight and New Powers for CNMC
A central element of the adopted measures is the expansion of powers of the National Commission on Markets and Competition (CNMC), which will now monitor system operators’ compliance with voltage control requirements every six months. CNMC will also carry out a special inspection plan focused on the ability to restore power after outages.
At the same time, REE has been required to present proposals for regulatory reforms concerning the management of voltage and power fluctuations. The corresponding legal changes are expected to come into effect within six months of their proposal.
New Grid Planning and Technologies
The grid development planning cycle will also be revised to occur every three years. The current plan for 2021–2026 will be accelerated and updated to include the use of so-called synchronous compensators and other technologies to enhance system stability.
There will also be a new provision allowing grid connection rights to be revoked if not used within five years. This measure is intended to reduce speculative investments and improve infrastructure access for viable projects.
Accelerating the Development of Renewables and Energy Storage
The government announced significant simplifications in the permitting process for energy storage projects and the modernization of existing renewable energy installations. Deadlines have also been extended for older renewable energy projects, giving them additional time to obtain operating licenses.
Simplifications were also introduced for prosumer installations of up to 5 MW. Their operational radius has been increased to 5 kilometers, offering greater flexibility in locating energy sources and consumption points. A new role of self-consumption manager will also be introduced to coordinate and optimize local energy systems.
One of the more innovative measures is the introduction of so-called independent energy aggregators, who will be able to combine various sources of generation, consumption, and storage into a single market-participating entity. Their role is expected to support system flexibility and enable more efficient use of local energy resources.
European Context and Future Challenges
The April 28 blackout served as a serious warning for all of Europe. In light of the growing share of renewable energy — which is inherently variable — EU countries must invest not only in new generation capacity but above all in flexibility, storage, and grid responsiveness. The Spanish reform may serve as a model for other EU member states, including Poland.
Source: renewablesnow.com