On October 26, 2026, the Spanish government issued a revised decree on data centers that promises a softer regulatory path while still leaving the sector grappling with its most contentious requirements. The new version of the regulation, sent to the Council of State later that same day, signals a shift in tone after months of industry frustration. What is clear from the text is that the government has reduced some of the initial stringency, yet it has not abandoned the core policy goal that has made data center development in Spain so contentious: a heavy reliance on renewable energy. The revision is framed as a compromise, but the details reveal that the most difficult requirements remain intact.
At the heart of the debate is the correlation requirement that mandates data centers to source 80% of their electricity from renewable sources at all times. This hourly correlation is the measure that has drawn the sharpest criticism from tech and energy firms alike. It means that even during periods of low wind or solar output, a data center must still draw from renewables, creating a costly balancing act for operators. The government has kept this rule in place, arguing that it is essential for Spain’s energy transition and for meeting its climate commitments. For developers, the requirement translates into higher upfront costs and more complex energy procurement strategies.
The 80% hourly correlation is not a new addition but a surviving element from the initial draft that the government has chosen to preserve. Under the revised decree, data centers must still meet this threshold, meaning that even when the wind is not blowing or the sun is not shining, the facility must be able to draw from renewable sources. This creates a persistent challenge for operators who must either overbuild their renewable capacity or invest in backup systems. The measure is designed to ensure that data centers do not become a net burden on the grid during periods of low renewable generation, but it does so at the expense of flexibility and economic viability.
Looking beyond 2028, the revised decree sets a more ambitious long-term target of 70% renewable energy for data centers.
To ease the immediate impact of the stricter requirements, the government has introduced a five-year transition period. During this window, data centers are permitted to operate at 60% renewable energy until the end of 2028. This phased approach allows operators to adjust their infrastructure plans, secure financing, and navigate the new regulatory landscape without facing an abrupt compliance deadline. The transition period is intended to give the sector time to adapt, but critics argue that five years is not enough in a rapidly evolving energy market where renewable costs are falling and storage solutions are improving.
The transition period culminates in a concrete target: by the end of 2028, data centers must meet 60% of their energy needs with renewables. This intermediate goal represents a significant step down from the initial draft's ambition of higher renewable penetration. For large-scale data centers, reaching 60% within three years will require substantial investment in on-site generation, power purchase agreements, and grid integration. The target is ambitious but achievable if operators can secure long-term renewable contracts and leverage Spain's growing solar and wind capacity.
Looking beyond 2028, the revised decree sets a more ambitious long-term target of 70% renewable energy for data centers. This goal reflects Spain's broader climate objectives and the growing importance of decarbonization in the tech sector. The government has signaled that the 70% target will be pursued once the transition period concludes and the market matures. Achieving this level will likely require further policy support, including incentives for renewable energy storage and grid modernization to handle the intermittency of wind and solar power.
Recognizing the industry's concerns, the government has also included a boost for the photovoltaic sector and extended the timeline for renewable energy installations. The decree now allows data centers to meet 60% of their energy needs with renewables until 2028, while also providing a moratorium on new renewable energy installations for five years. This moratorium is designed to give developers time to plan and secure financing without the immediate pressure of compliance deadlines. The extended timeline for photovoltaic plants to supply energy to data centers—now set at 36 months—further eases the financial burden on developers who must wait longer to see the full benefits of their investments.
The five-year moratorium on new renewable energy installations is a significant concession to the industry. By delaying the deployment of solar and wind capacity, the government acknowledges that building the necessary infrastructure takes time and that rushing into compliance could undermine the entire project. This pause is meant to align the energy supply side with the demand side, ensuring that data centers have a reliable and affordable renewable energy supply when they are built. The moratorium applies to new installations, not existing ones, allowing current projects to proceed under the existing framework.
The pushback from the tech, energy, and renewable industries was not hidden. Sector representatives have repeatedly warned that the revised decree, despite its softening of some requirements, still imposes a heavy burden that could make future investments in Spain unviable. The correlation requirement, in particular, has been called an unrealistic demand that ignores the realities of grid variability and the economics of data center operations. The government has responded by framing the changes as a necessary step toward Spain's climate goals, arguing that the transition period and the gradual ramp-up to 70% renewable targets provide a realistic path forward.
Amid the regulatory uncertainty, the Spanish government has signaled its commitment to the data center sector through significant public investment. A total of 67,000 million euros is committed between 2026 and 2030 to support the growth of data centers in the country. This investment is expected to create jobs, stimulate innovation, and position Spain as a regional hub for cloud computing and digital services. The funding will flow through various channels, including grants for renewable energy projects and subsidies for data center operators that meet the new sustainability criteria. The scale of the investment underscores the government's belief that the sector is worth nurturing, even as it walks a tightrope between economic growth and environmental ambition.
Behind the political decisions, the Ministry for the Ecological Transition has played a central role in shaping the revised regulations. The ministry has worked closely with industry stakeholders to negotiate the balance between ambitious renewable energy targets and the practical needs of data center developers. Its revised data center regulations represent the ministry's attempt to align national policy with market realities, ensuring that the transition to a greener energy system does not come at the cost of stifling innovation. The ministry's involvement has been critical in refining the transition period, adjusting the renewable targets, and extending timelines for renewable installations—all moves designed to make the regulatory framework more workable for the private sector.
From the perspective of the sector, the revised decree is a mixed bag. While the five-year transition and the 60% renewable target are seen as steps in the right direction, the persistence of the 80% hourly correlation remains a major hurdle. Industry groups have called for further reductions in the correlation requirement and for more flexibility in how data centers can meet their renewable energy obligations. The push for a faster timeline to reach 70% renewable energy is also a rallying cry, as developers seek to align their projects with the broader European Union targets for climate neutrality.
As of late 2026, the revised decree has been sent to the Council of State for final approval, a procedural step that will determine whether the changes take effect as planned. If approved, the new rules will begin to reshape the data center landscape in Spain, offering some relief to developers while still demanding a significant shift toward renewable energy. The next few years will be critical, as the sector navigates the transition period, secures financing, and works to meet its increasingly ambitious sustainability targets.
The Spanish government's revised data center regulations represent a careful attempt to reconcile two powerful forces: the urgent need to decarbonize the energy sector and the practical realities of building large-scale data centers. By softening some requirements while preserving the core renewable energy mandate, the government has created a framework that is both ambitious and somewhat flexible. Whether this approach will succeed in attracting investment and meeting climate goals will depend on how well the sector can adapt and whether the transition period proves sufficient for operators to adjust their strategies.
"The government has softened some requirements while keeping the most contentious measures from the initial draft," a source familiar with the negotiations explained. "The five-year transition and the gradual ramp-up to 70% renewable energy are steps in the right direction, but the 80% hourly correlation remains a significant barrier for many developers."
Speaker: Government negotiator Source: Spanish government, Ministry for the Ecological Transition