TL;DR · 30-second read

The Short Version

Spain wants new data centers, the warehouse-sized buildings full of computers that run websites, apps and artificial intelligence, to help build the clean power they use.

Under a draft government rule, new sites would have to get at least 80 percent of their electricity from newly built wind, solar or similar sources, checked hour by hour. That includes nights, when solar panels produce nothing.

Sites that fall short would pay rising charges and could eventually lose their connection to the power grid. People familiar with the draft say it is not a ban, but it would make building harder.

The Spanish government has approved a draft decree, on a fast-tracked legislative path, that would require new data centers with 1MW (one megawatt) or more of capacity to source at least 80 percent of their electricity from new renewable generation, with compliance measured hourly rather than annually. Europa Press first reported the draft on August 26, 2026, and Data Center Dynamics relayed the details. The proposal is expected to go to public consultation before it takes effect.

The renewable supply must be additional: each new megawatt of data center capacity would be matched by equivalent renewable generation installed within the 18 months before the facility starts operating. Operators that fall short would face escalating surcharges on grid charges and network tariffs, and could ultimately lose grid access. The requirement would apply until Spain’s electricity mix reaches 90 percent renewables.

Executive Summary

Spain’s draft rule goes further than most corporate clean-energy commitments in three ways at once. It requires new generation rather than existing supply, it sets a high threshold of 80 percent, and it measures compliance hour by hour. It applies to new projects only, gives projects already under development a six-month grace period (three months for those awaiting a grid-access tender), and adds a requirement to meet the top tiers of a forthcoming European energy and water efficiency label for data centers.

The stakes are large because Spain has become one of Europe’s busiest data center markets. More than 10GW (gigawatts, thousands of megawatts) of data center projects are seeking grid connections in the country. A rule that ties every new megawatt to new renewable build, matched around the clock, turns energy procurement from a sustainability line item into a precondition for getting built.

The central consequence is less about how much clean power a project buys and more about when it arrives. Spain’s renewable strength is abundant daytime solar; an hourly test asks what supplies a data center at 3 a.m.

Hourly Matching Moves the Problem to the Night

Most corporate renewable claims today are settled annually. A company buys enough renewable energy over a year to equal its total consumption, and a surplus of midday solar can be counted against electricity drawn from gas or other sources at night. Spain’s draft closes that gap by measuring compliance hourly. Data centers draw close to the same power around the clock, so an 80 percent hourly test means clean supply has to be available in the evening and overnight hours as well, not just when the sun is high.

That is why the practical constraint shifts. The reported compliance routes include onsite deployments such as rooftop solar, but rooftop solar at a facility drawing a megawatt or more covers only a fraction of its load, and only in daylight. Meeting the threshold in dark hours points operators toward wind contracts, battery storage, or power purchase agreements (PPAs, long-term contracts to buy output from a specific generator) structured around a flat, 24-hour load profile. Those products are scarcer and typically priced higher than plain solar output. The people most affected are developers in Spain’s 10GW-plus connection queue, and the winners are likely to be sellers of firmed or shaped clean power rather than sellers of cheap daytime megawatt-hours.

The policy logic is straightforward: without additionality and time-matching, a fast-growing class of large, constant loads can absorb existing clean supply that other consumers would otherwise use, while leaving night-time demand to fossil plants. The open question is cost. An hourly 80 percent standard is materially harder and more expensive to meet than an annual one, and the draft as reported does not show how the government weighed that against the pace of investment it has been attracting.

An 18-Month Clock Couples Two Build Schedules

The additionality clause requires matching renewable generation to be installed within the 18 months before a data center reaches operational status. In effect, a data center’s opening date becomes dependent on a second infrastructure project: a wind farm, solar plant or storage installation that needs its own site, permits and grid connection. Delay on the generation side becomes delay on the data center side.

That favors operators who already develop renewable assets or who can partner early with utilities and independent power producers, and it disadvantages developers who planned to sign a supply contract late in construction. It also raises the importance of the transition terms: projects already under development get six months to comply, or three months if they are waiting on a grid-access tender. For projects whose timelines were set assuming existing supply, those windows are short relative to how long new generation typically takes to build.

The requirement is designed to expire once Spain’s electricity mix reaches 90 percent renewables. That sunset signals the rule is meant as a bridge while the grid decarbonizes, not a permanent cap, but it also means the burden falls hardest on projects built in the years before that threshold is reached.

Enforcement Runs Through the Grid Bill

The draft’s enforcement mechanism is notable. Rather than fines alone, shortfalls would trigger escalating surcharges on grid charges and network tariffs, with potential loss of grid access at the extreme. For a data center, grid access is the asset; putting it at risk makes compliance a matter of operational continuity, and lenders and customers signing long-term contracts will likely want to see the compliance plan before they commit.

Layered on top is an efficiency requirement: new facilities would be expected to meet the highest levels of the European data center energy and water efficiency labeling scheme that the European Commission is slated to enforce within a year. Combined, the measures raise the bar on both how a facility is powered and how efficiently it uses that power and water.

People familiar with the draft told Europa Press that it does not amount to a moratorium, and that is accurate on its face: nothing prohibits building. But the combination of additionality, hourly matching, short grace periods and grid-linked penalties could significantly curtail development, and it is reasonable to expect the 10GW queue to thin toward projects with credible, round-the-clock clean supply. This is one country’s draft rather than a European standard, and it is still subject to consultation, so its final shape matters as much as its headline number.

Background

Spain has been experiencing a data center boom, with operators drawn by its available land and strong renewable resources. More than 10GW of data center projects are currently seeking grid connections in the country, a queue that puts pressure on both grid capacity and the clean-power supply that other sectors are also counting on to decarbonize.

The draft decree draws on two ideas that have been gaining ground in clean-energy policy: additionality, which requires that a buyer’s demand be met by newly built generation rather than existing plants, and time-matching, which checks whether clean supply is available in the same hours the electricity is consumed. Many large technology buyers have pursued these goals voluntarily; Spain’s draft would make them a regulatory condition for new data centers of 1MW and above.

Sources

Source: Spain drafts rules requiring data centers to source 80% of power from new renewables – report — Data Center Dynamics on Spain’s draft decree requiring new data centers of 1MW or more to source 80% of their power from new renewables on an hourly basis.

TL;DR · 30-second read

The Short Version

A Barcelona company best known for keeping computers cool is spending about €1 billion to build and run its own huge computer warehouse for artificial intelligence.

Submer plans to put it on the grounds of an old chemical factory in the Spanish town of Flix, which stopped operating in 2023. Catalonia’s regional president turned out for the announcement.

What makes it interesting: a company that used to sell equipment to building owners now wants to be the owner. It has not yet said how big the site will be, when it opens, or who will use it.

Submer, the Barcelona-based company that built its name in immersion cooling, plans a €1 billion ($1.14 billion) AI data center on the site of the former Ercros chemical plant in Flix, Catalonia, Data Center Dynamics reported. The facility will be built in two phases and operated by Rubix Data Centers, the AI data center division Submer launched in June, which aims to lease it to a single tenant running AI workloads.

The project was unveiled on Saturday, July 11, at an event attended by Salvador Illa, president of the government of Catalonia, and Miquel Sàmper, the regional minister of business and labor. Submer has not disclosed the facility’s planned capacity or construction timeline; renders appear to show four data halls arranged around a central building.

Executive Summary

The headline number is €1 billion, but the more consequential fact is who is spending it. Submer’s business has been supplying cooling systems to other people’s data centers. With Flix, it becomes a developer and operator in its own right, following last year’s launch of the InferX AI cloud platform and June’s launch of Rubix Data Centers.

Submer CEO Patrick Smets framed the move as a deliberate climb up the value chain: “we will expand across the full stack, from land and power to cloud and Edge.” Rubix, led by former Stack executive John Eland, leads its pitch not with cooling technology but with a claim of 8GW of power available across vacant sites in the Americas, EMEA and APAC. That ordering signals where the company believes durable value in AI infrastructure now sits.

What the announcement does not yet establish is the project’s scale, power supply, financing or customer. Until those are disclosed, Flix is best read as a statement of strategy and site selection rather than a funded, contracted build.

From Selling Cooling to Owning the Building

Submer’s trajectory over roughly a year tells the story: an immersion cooling specialist (immersion cooling submerges servers in a non-conductive liquid to carry heat away more efficiently than air) launched an AI cloud platform, InferX, then a data center division, Rubix, and now a €1 billion campus. Each step moves the company closer to the end customer and further from being a component supplier.

The economic logic is straightforward. An equipment vendor is typically paid once per deployment, and its fortunes depend on how many facilities its customers build. An operator that leases a facility earns recurring rent for the life of the lease and controls the asset that everything else depends on: the site, the building and its power supply. Smets’ own phrasing, “from land and power to cloud and Edge,” puts land and power first. Eland made the same point from the operator’s side: “We intend to operate the facility we are building here, so we are not simply passing through Flix.”

That is the substance behind reading Flix as a bet on land and power rather than on cooling hardware. The company has not said whether Submer’s own immersion systems will be deployed at Flix, which underlines the point: the announcement is about owning capacity, not showcasing a product.

Why Power Is the Asset Rubix Leads With

For AI data centers, the scarce input is increasingly not buildings or servers but a site with a large, deliverable grid connection. That is why Rubix’s headline claim is 8GW of available power across vacant sites, a figure measured in gigawatts, or thousands of megawatts. Framing a data center business around power first reflects how the market now prices development opportunities.

Former heavy-industrial sites such as the Ercros plant are attractive candidates in principle, because industrial users often required substantial electrical infrastructure and the land is already zoned for industrial use. Ercros also operates a solar farm on the site today. But Submer has not said what grid capacity is available at Flix, whether it is already connected, or how the solar installation fits into the project’s power plans. Those details will determine how quickly and how large Flix can realistically become.

The 8GW figure deserves the same even-handed reading. It is a claim about power available across vacant sites, and Rubix has not broken it down by location, by grid status or by how much of it is contractually secured versus identified. As a signal of ambition it is clear; as a measure of deliverable capacity it is not yet substantiated.

The Single-Tenant Model Cuts Both Ways

Rubix aims to lease Flix to a single tenant for AI workloads. This build-to-suit approach is common for large AI campuses: one creditworthy customer on a long lease can anchor the financing for a very large build, and two-phase construction lets capital be deployed in step with demand.

The flip side is concentration. Until a tenant signs, the €1 billion figure describes an intended investment rather than a committed one, and the facility’s design, timing and financing will likely hinge on that single counterparty. Without a disclosed capacity, it is also impossible to judge whether €1 billion is a large or modest sum per megawatt relative to comparable AI builds.

A Supplier Becoming a Peer, With Political Backing

Moving into operations can create tension with existing customers: data center operators that buy Submer cooling may now find the same company bidding for AI tenants. How Submer manages that overlap between its cooling business and Rubix will be worth watching.

On the other side of the ledger, the project arrives with visible public support. The presence of Catalonia’s president and its business minister at the launch, and Submer’s framing of the project as part of the “reindustrialization of Flix,” suggest the regional government sees AI infrastructure as a use for idled industrial land. That backing can matter for permitting and grid access, though no specific commitments from the administration were announced.

Background

Submer, based in Barcelona, established itself as a specialist in immersion cooling, a technique that submerges servers in a non-conductive fluid to remove heat more efficiently than traditional air cooling, an approach that has gained attention as AI chips grow denser and hotter. Over the past year the company has expanded beyond cooling, launching the InferX AI cloud platform and, in June 2026, Rubix Data Centers, a division that develops and operates AI data centers and is headed by John Eland, formerly of data center operator Stack.

The Flix site was home to a chemical plant run by Ercros until industrial operations ceased in January 2023. Ercros now operates a solar farm on the site. Redeveloping former industrial land for data centers has become a recurring theme as developers look for sites with industrial zoning and access to power.

Sources

Source: Submer plans €1bn data center at former chemical plant in Catalonia (Data Center Dynamics) — Submer’s Rubix division will build and operate a two-phase AI data center on the former Ercros site in Flix.