Summary
- The draft rules would principally apply to data centres with at least 1MW of electricity-grid access capacity.
- Until renewables exceed 90% of Spain’s generation mix, covered facilities would have to match at least 80% of hourly consumption with additional renewable generation.
- Persistent non-compliance could lead to higher network charges and ultimately loss of grid-access and connection rights.
Spain’s Ministry for the Ecological Transition and the Demographic Challenge has proposed a regulatory framework that would link large data centre grid access to renewable-energy procurement, energy and water efficiency, resilience, and digital-sovereignty requirements.
The draft Royal Decree is open for submissions until 17:00 on 10 September after the consultation period was extended from its original deadline. Its principal requirements would apply to data centres with electricity-grid access capacity of at least 1MW.
The threshold is based on grid-access capacity rather than IT load because the regulation is intended partly to govern allocation of transmission and distribution capacity. Separate reporting obligations would apply to facilities with at least 500kW of IT capacity.
Spain has seen a sharp increase in data centre connection demand. MITECO says more than 6GW of transmission access has been granted to the sector since the end of 2023, while distribution networks have awarded around another 6GW since 2020.
The government argues that accommodating the full volume of prospective demand would require a substantial share of the reinforcement planned for the national electricity network. The draft therefore makes compliance with several environmental and infrastructure conditions part of obtaining and retaining grid access.
Renewable additionality is one of the central requirements. Until renewable generation exceeds 90% of Spain’s electricity mix, covered data centres would be required to source at least 80% of their electricity from renewable generation.
The associated generation would also have to be new. Each new megawatt of consumption would need to be backed by one megawatt of renewable capacity installed within the 18 months before the data centre enters operation, either through onsite generation or contractual mechanisms such as power purchase agreements.
Annual matching would not be sufficient. In each hour of operation, at least 80% of electricity consumed would have to be matched by renewable power generated during that same hour.
That changes the engineering and procurement implications of renewable supply. A portfolio of annual certificates cannot by itself address hours when renewable output is low, increasing the importance of generation profile, storage, contractual structure, and potentially the ability to shift flexible loads.
Efficiency requirements extend to the physical facility. Until the planned European data centre labelling system applies, currently expected in August 2027, the draft sets maximum values of 1.15 for Power Usage Effectiveness and 0.1 for Water Usage Effectiveness.
Once the EU system applies, covered facilities would be expected to meet its highest category for energy and water performance. That would make thermal design, water consumption, and electrical overhead part of regulatory compliance rather than voluntary sustainability reporting alone.
The draft also gives grid access a direct enforcement role. Projects seeking connection rights would have to demonstrate compliance, while breaches could result in escalating surcharges on network charges and tolls. Significant and repeated non-compliance could ultimately lead to loss of access and connection rights.
Projects already moving through the connection process would receive transitional periods. Most would have six months to adapt, falling to three months for projects awaiting a competitive grid-access procedure, with an option to relinquish access rights without execution of the associated guarantees.
Facilities with at least 500kW of IT capacity would additionally have to report information on energy performance, renewable use, water footprint, and demand for annual publication. Sites above the 1MW access threshold would have further obligations connected to the European Code of Conduct for Data Centre Energy Efficiency.
Digital-sovereignty provisions add another condition for workloads involving the Spanish public sector. The draft seeks to keep relevant public-sector information, including associated operational records and copies, within the legal and jurisdictional framework of the European Union.
The proposal therefore joins together issues that European data centre policy has often handled separately: grid capacity, renewable procurement, cooling and water performance, reporting, resilience, and the jurisdiction of digital infrastructure.
Spain’s final rules may change after consultation. In their current form, however, they would make the quality of a project’s energy and infrastructure strategy a condition of access to scarce grid capacity rather than an environmental commitment made after the facility is built.
