Spain moves to make data centres back 80% of every hour with new renewables
Spain approved urgent processing of a draft royal decree on 25 August 2026 making data centres of 1 MW or more back 80% of hourly demand with renewables.
Photo by Brett Sayles on Pexels
Spain’s Council of Ministers agreed on 25 August 2026 to fast-track a draft royal decree that would tie new data centre grid connections to renewable electricity, water efficiency and digital sovereignty tests. Under the Spain data centre rules as drafted, any facility with 1 MW or more of access capacity would have to show that at least 80 per cent of the electricity it consumes in each hour is backed by renewable generation produced in that same hour, and that the plant supplying it was commissioned no more than 18 months before the data centre started operating. The Council of Ministers reference records only an agreement authorising urgent administrative processing under article 27.1.b) of Law 50/1997; the decree itself has not been approved.
The text went straight to public hearing. The MITECO consultation page sets a window running from Thursday 27 August to Friday 4 September 2026, nine days, a consequence of the urgent route halving procedural deadlines. The decree is mandated by the first additional provision of Royal Decree-Law 7/2026 of 20 March, and is proposed jointly by the Ministry of Economy, Trade and Enterprise, the Ministry for Ecological Transition and the Demographic Challenge, and the Ministry for Digital Transformation and the Civil Service. It would enter into force 20 days after publication in the Boletin Oficial del Estado.
How the Spain data centre rules would work
Reporting has widely described the 80 per cent requirement as lapsing once renewables exceed 90 per cent of the Spanish generation mix. The draft does not work that way. Article 4.1.c sets two alternative compliance routes, and article 7 defines the second.
| Route | Trigger | What the operator must do | Residual condition |
|---|---|---|---|
| Additionality and hourly matching (articles 8 and 9) | Default | Cover 80% of total consumption through self-consumption or forward renewable power purchase agreements with plants located in Spain, commissioned no more than 18 months before start-up; back at least 80% of each hour’s consumption with renewable output generated in that hour | Consumption capped at the level for which additionality can be evidenced |
| National renewable share (article 7) | Renewable share of national generation exceeded 90% in year n-2, where n is the year the grid access application is filed | No prior additionality or hourly-matching evidence required | Annual grid-consumption hours capped at total hours of the year multiplied by the renewable share of year n-2 |
Source: draft royal decree on energy, environmental, resilience and digital sovereignty requirements for data centres, articles 4, 7, 8 and 9, MITECO public hearing text.
The 90 per cent test is measured two years before the application, not in real time. Once exceeded in a calendar year, the share is treated as remaining above 90 per cent for the following five calendar years. The Secretary of State for Energy must publish the figure and the maximum hours in the Boletin Oficial del Estado at least two months before the year begins, and until it does, the draft states the share is taken to be below 90 per cent.
That threshold is a long way from current output. Red Electrica reported that renewables supplied 55.5 per cent of national generation in 2025, or 56.6 per cent counting self-consumption, below the record 56.8 per cent set in 2024. Redeia’s first-half 2026 results put 81.9 TWh of renewable output at 59.9 per cent of Spanish generation, or 61.0 per cent with self-consumption.
Article 8 requires the qualifying generation plant to be located in Spain, a condition absent from most coverage and consequential for the Iberian power purchase agreement market. Article 9, which sets the hourly matching duty, does not repeat that siting requirement. The threshold in article 2.1 is 1 MW of access capacity “or more”, and it aggregates co-located sites under common ownership that reach that level together. A second tier in article 2.3 applies the reporting duty in article 14 to operators with IT power of 500 kW or more, regardless of access capacity. Facilities used exclusively for defence, civil protection and public security are excluded.
Efficiency, water and sovereignty
The draft requires class “A” energy and water efficiency under the European data centre label to be issued under Directive (EU) 2023/1791. Because that label is not expected to apply until August 2027, the fourth transitional provision sets interim numbers: power usage effectiveness of 1.15 or below and water usage effectiveness of 0.1 or below, both calculated under Annex III of Delegated Regulation (EU) 2024/1364. Sitting at class “B” or lower on either measure for two consecutive years is defined as a serious breach. There is no water abstraction cap, no cooling technology mandate and no waste heat reuse duty in this decree; heat reuse is handled in a separate MITECO draft.
The digital sovereignty conditions in article 5.2 are narrower than headlines suggest. They require establishment in the European Union, EU retention of the data, metadata and logs the operator handles as part of running the facility, controls and traceability over support access from third countries, contractual supervision of direct subcontractors, and measures against third-country data demands that conflict with EU or national law. The text states explicitly that the retention duty does not extend “to the systems, data or services of its clients over which it has no access or control”. A separate localisation mandate in article 5.3 does apply to public-sector and national-security workloads covered by the National Security Framework, which must be processed, stored and transferred only within the European Union, including metadata, telemetry, logs, replicas and backups.
Enforcement runs through network charges rather than fines. Article 10 sets surcharges on tolls and system charges scaled to the size of the breach, with loss of access and connection rights as the end point under article 11.1.
| Breach | Surcharge on network tolls and charges |
|---|---|
| Renewable cover below 20% of annual consumption | 500% monthly |
| Renewable cover 20% to 40% | 400% monthly |
| Renewable cover 40% to 60% | 300% monthly |
| Renewable cover 60% to 80% | 100% monthly |
| Non-compliant hours below 5% of the year | 10% |
| Non-compliant hours 5% to 20% | 30% |
| Non-compliant hours above 20% | 50% |
| Exceeding the article 7 hours cap | 65%, rising 10 percentage points per additional consecutive year |
Source: draft royal decree, article 10, MITECO public hearing text.
Who is affected and when
Existing connected facilities are outside the scope: the requirements attach to data centres connecting after the decree enters into force, with connection defined as electrical coupling plus a signed network access contract. For everyone else the draft sets three separate clocks, which several outlets have reported in the wrong order.
| Situation | Period | Consequence of failure |
|---|---|---|
| Grid access application pending (first transitional provision) | 3 months from entry into force | Application refused after a cure notice and hearing |
| Application suspended by a demand capacity auction (second transitional provision) | 3 months from entry into force | Application refused |
| Access permit granted but not yet connected (third transitional provision) | 6 months from entry into force | Permits lapse and deposited guarantees are executed |
| Voluntary withdrawal of an application or permit (second additional provision) | 6 months from entry into force | Guarantees are not executed |
Source: draft royal decree, transitional provisions one to three and second additional provision.
The regulatory impact memorandum accompanying the draft sets out the pressure the government is responding to. It states that the transmission system operator has granted data centres more than 6 GW of access capacity “in recent years”, with roughly another 6 GW granted at distribution level, the source of the more than 12 GW figure circulating in coverage. Against that, the memorandum notes that Spain’s 2024 artificial intelligence strategy anticipated 2.5 GW of computing capacity by 2030, equal to between 3.5 and 4 GW of electricity demand, “and the forecasts of the sector itself and of independent analysts are in similar or lower ranges”. Deputy Prime Minister and Minister for Ecological Transition Sara Aagesen has described the volume of requests as a bubble. No official has been quoted directly on the decree itself; the Moncloa reference carries no press conference text on the item, and news coverage attributes its detail to unnamed government sources.
Commercial capacity in service is far smaller than the access pipeline. The Spain DC association and Pb7 Research reported in March 2026 that installed IT power across commercial colocation and hyperscale facilities reached 439 MW at the end of 2025, up from 355 MW in 2024, with a potential 2,537 MW by 2030. Those figures measure IT power at commercial sites and are not comparable with grid access rights.
The draft is part of a wider European argument about who pays for the electricity that computing consumes, a question Winss Solutions has covered through research on agrivoltaics powering AI data centres on comparatively little land and through the EU Electrification Action Plan targeting 46% by 2040.
Background: how Spain got here
Spain has regulated data centre energy use in stages. Directive (EU) 2023/1791 introduced EU-wide reporting for facilities of 500 kW of IT power or more, implemented through Delegated Regulation (EU) 2024/1364, which defines the PUE and WUE methods the Spanish draft borrows. MITECO consulted in 2024 and 2025 on a narrower draft covering energy efficiency and sustainability alone, without the resilience and sovereignty elements. Royal Decree-Law 7/2026 of 20 March, adopted as part of a package responding to the Middle East crisis, then required the government to set these requirements by royal decree, which is the instrument now out for hearing.
The sovereignty strand has a separate origin. The impact memorandum cites the Ministry for Digital Transformation’s roadmap on accelerating digital sovereignty, which states that more than 80 per cent of cloud services and 90 per cent of European data are controlled by United States companies. The draft’s answer is procedural rather than prohibitive for private workloads: a responsible declaration filed with the digital ministry before commissioning, and a prior declaration to the grid operator, which may not sign a network access contract without evidence that the declaration has been filed. Operators may also offer voluntary commitments to reserve storage or computing capacity for Spanish or European companies, which would count in their favour in demand capacity auctions. Whether any of it survives to the final text will not be clear until after the hearing closes on 4 September.
Sources: MITECO, draft royal decree; MITECO, public hearing; MITECO, Memoria del Analisis de Impacto Normativo; La Moncloa, Council of Ministers reference; Red Electrica, Informe del Sistema Electrico 2025; Redeia, first-half 2026 results; pv magazine Espana; eldiario.es
Featured image: photo by Brett Sayles on Pexels (free Pexels license).
Become a Sponsor
Our website is the heart of the mission of WINSS – it’s where we share updates, publish research, highlight community impact, and connect with supporters around the world. To keep this essential platform running, updated, and accessible, we rely on the generosity of you, who believe in our work.
We offer the option to sponsor monthly, or just once choosing the amount of your choice. If you run a company, please contact us via info@winssolutions.org.
I specialize in sustainability education, curriculum co-creation, and early-stage project strategy. At WINSS, I craft articles on sustainability, transformative AI, and related topics. When I’m not writing, you’ll find me chasing the perfect sushi roll, exploring cities around the globe, or unwinding with my dog Puffy — the world’s most loyal sidekick.
