Spain requires data centres to operate on 80% renewable energy every hour, or they will not be granted a grid connection.

      Spain has created a decree that mandates new data centers to obtain at least 80% of their electricity from renewable sources during each hour of operation, with the penalty for non-compliance being the loss of grid connection. This represents a significantly stricter stance than that of Brussels, which previously suggested that Big Tech align data centers with climate objectives without a clear enforcement mechanism, and it comes at a time when Denmark has already suspended grid connections entirely.

      The hourly requirement poses a significant technical challenge. While achieving annual matching—where an operator purchases sufficient renewable energy over a year to cover their consumption—is relatively straightforward, hourly matching necessitates that power is available precisely when the servers need it.

      New installations come with an added responsibility. Each new megawatt of capacity must be accompanied by corresponding renewable installations that are operational within 18 months, accomplished either through contracts or local construction. This effectively holds each data center accountable for generating the electricity it uses, reflecting the same "polluter pays" principle that Australia has attempted to legislate, albeit Spain has a more straightforward constitutional approach to enforce it.

      The feasibility of the grid supporting this requirement is a different matter from the capabilities of operators. Achieving hourly matching relies on storage, interconnection, and generation profiles that differ by region, and a nationally written rule must function in areas where sunset times are uniform.

      Operators must be established in the EU, ensuring that all data and metadata remain within European borders, restricting access from external nations, and applying enhanced protections to data belonging to public entities or related to national security. This condition acts as a sovereignty measure disguised as an environmental regulation. By requiring EU establishment and European data residency, it directly targets American hyperscalers that have developed much of Spain’s recent capacity.

      Furthermore, this scenario is a unique case of a member state implementing stricter data residency regulations than what EU law stipulates. While GDPR limits data transfers, a blanket requirement to retain data and metadata in Europe surpasses the bloc's previous stance.

      Water and efficiency standards will align with the highest sustainability label currently being established by the EU for the sector. Given Spain’s water situation, especially with extensive drought restrictions experienced in recent summers, this alignment is politically necessary.

      The decree applies to facilities exceeding one megawatt that have not yet connected to the grid. Projects already in the permitting phase will have six months to comply or lose their connection rights without compensation. This six-month period may be insufficient for projects based on assumptions regarding power costs. Developers who based their financial models on annual renewable matching must either reassess their calculations or relinquish a queue position that may have taken years to secure.

      Spain has emerged as one of Europe’s fastest-growing data center markets due to its inexpensive renewable energy sources and available land, a combination that developers have sought as capacity shifts away from the traditional major markets.

      Government sources present the decree as a means of selecting the most effective and beneficial projects rather than accepting all that are proposed. However, this approach carries risks as developers have alternatives. Capacity that does not meet Spain’s standards can be redirected to Portugal, Italy, or the Nordics, and past research has indicated that Europe’s sovereign AI aspirations may be hindered by limitations imposed on data centers rather than on the quality of the models.

      Madrid is wagering that projects will proceed regardless. Spain possesses the essential resources the sector demands: sunshine, wind, land, and interconnection capacity, and a government that recognizes its valuable assets can afford to impose conditions on their use.

      This decree is set to open for public consultation this week. As the reporting is based on sources rather than official statements, the language may be revised before finalization. Stakeholders in the industry will have the opportunity to present their arguments, particularly focusing on the hourly matching requirement, which will likely be the main point of contention.