Imagine a highway on which not a single vehicle can fit anymore. But the problem is not that there is a lack of asphalt, but that the cars do not know how to drive efficiently and keep kilometer-long safety distances. The Spanish electrical grid was exactly that. It had been operating for years at the limit of its administrative capacity, and suddenly, a convoy of trucks of industrial tonnage and voracious appetite has arrived at the access ramp: data centers.
These megainfrastructures, pillars of artificial intelligence and the cloud, promise to water the economy of millions, but their brutal need for supply threatened to burst the seams of an already saturated electrical system. To avoid collapse and not let the reindustrialization train escape, the Government has had to react and radically change the technical rules of the game.
Cascading capacity collapse. To understand the collapse we have to look at how our way of consuming energy has changed. The energy transition is profoundly reconfiguring the model throughout the national territory. Requests to connect to transportation and distribution networks have skyrocketed. In addition to the electrification of industry and renewable hydrogen, there is now massive consumption associated with data centers for artificial intelligence. The problem broke out when the National Markets and Competition Commission (CNMC) established a “dynamic criterion” to calculate how much access capacity was available in the areas shared by several network nodes.
As detailed by the Ministry for the Ecological Transition and Demographic Challenge (MITECO) in his press releaseapplying this criterion means that a single access requested at a node can cause a “cascading effect that drains capacity in the rest of the nodes that share the area”, blocking requests from dozens of kilometers away. Basically, a large data center asks for passage and, automatically, the system administratively blocks neighboring nodes as a precaution, even if physically the cables have plenty of space.
Investments in the air and the ghost of the blackout. The consequences of this traffic jam directly affect the real economy and national security.
- Real estate and industrial paralysis. The situation is so critical that, as we already mentioned in our previous coverage citing the Asprima employers’ associationlast year only 12% of connection requests for new urban developments were granted. There are 350,000 homes at risk simply due to lack of electrical power.
- The risk of an electrical “zero”. The Official State Gazette warns that the increase in installations that are not able to withstand “tension gaps” poses a very high risk. If there is a disturbance and these generators are massively disconnected, exchange flows are produced that are incompatible with Spain’s limited interconnections with Europe. As the diary recalls The Countrythe objective is to avoid at all costs a repeat of massive blackouts like the one suffered by the Iberian Peninsula on April 28, 2025.
- It is not enough to put more cables. In areas limited by this dynamic criterion, it is no longer possible to enable new capacity simply by investing money in reinforcing the network with “more copper.” The expert in the sector Joaquín Coronado sums it up perfectly: the demand must be 100% active; It must provide flexibility and commit to the stability of the system.
The Government’s emergency surgery. To unclog this Gordian knot, the Government and regulators have launched a three-way shock plan:
- The new Royal Decree of MITECO. The Ministry has been brought to public hearing (until March 16) a standard that updates the technical requirements to connect to the network. The master key is that now it is required that the demands “withstand voltage gaps”, do not introduce adverse oscillations and maintain the quality of the wave. By forcing installations not to disconnect in the event of small disturbances, the number of nodes affected in shared areas is reduced. This simple technical measure could bring out 50% more capacity in about 900 knots of connection to the high-voltage network.
- The “flexible permits” of the CNMC. To put an end to the binary model (either I give you all the capacity or I deny it), the CNMC has proposed four new types of permits, as we already broke down in Xataka. These range from allowing consumption only in certain time slots, to “dynamic” permissions where the operator can remotely disconnect a data center if there is an emergency on the network.
- The “technical amnesty” for data giants. In parallel, the Ministry of Industry has been urgently removed the “off-peak” requirement. Previously, to receive aid, you had to consume at night, an absurdity for a data center (which operates 24/7) and for today’s Spain, where solar energy has brought down prices at midday.
The citizen cost and the fine print. The Government’s maneuver not only responds to a national emergency, but also places Spain as a pioneer on the continent. The country is anticipating the update of the European network codes, deploying a battery of technical specifications simultaneously that is already considered a milestone worldwide, as detailed The Country. In this deployment, the new regulations also settle a historical debt with energy storage: batteries will finally have their own specific regulatory framework, no longer being administratively treated as simple “generation by analogy” facilities.
However, this deep digitalization so that the network supports such a complex mode of operation will not come for free, and the bill for modernization will end up looming in the consumer’s pocket. Forecasts for 2026 They already estimate direct increases in citizen receipts, with a 4% increase in tolls and a not inconsiderable 10.5% in electricity system charges. And while citizens assume the technical cost, the data giants – recipients of this regulatory red carpet – prefer to remain cautious in the face of the eternal Spanish bureaucratic obstacle. The technology sector warns that a key piece of the puzzle is missing: If the Government does not expressly include the National Code of Economic Activity (CNAE) corresponding to “Data Processing” in the official list of sectors entitled to receive the million-dollar electro-intensive aid, all these technical facilities will end up being a dead letter.
From the wired network to the smart grid. Spain has all the natural and investment potential to transform its production model and go from being the country of “sun and sand” to the country of “sun and data”. However, as this capacity crisis demonstrates, the electrical grid has ceased to be a simple cable infrastructure and has become an intelligent institution that requires millimeter management.
Giving flexibility to the system, demanding robustness from the new technological giants and streamlining bureaucracy are no longer technical options. They are, today, the only realistic escape route to prevent green reindustrialization, the artificial intelligence revolution and housing construction from dying of success due to the lack of a simple plug.
Image | freepik and Nekib Ahmed
Xataka | Spain has a plan to capture more data centers than anyone else: “shield” them from energy costs
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