Electricity consumption tied to IT infrastructure, data processing, and hosting is growing at a much faster pace than overall demand in Spain. In July 2026, CNAE 63 rose 55.1% year-over-year within the Red Eléctrica Index (IRE) of large consumers, after several months of gains between 40% and 77%. The figure confirms that data centers are starting to gain weight as a new source of electricity demand, though they remain far behind sectors like metallurgy in absolute volume.
Data center electricity use in Spain in 30 seconds
- CNAE 63, which covers data processing and hosting, grew 55.1% year-over-year in July.
- It has posted monthly gains of between 40% and 77% for six straight months.
- It still doesn’t rank among the twenty sectors with the highest absolute electricity consumption.
- Spain has granted more than 12 GW of grid access capacity to data center projects.
- The government wants to require 80% additional renewable supply with hourly correlation.
The figure fits a broader trend. Spain’s electricity demand rose 2.4% year-over-year in August, once adjusted for temperature and working-day effects. In gross terms it reached 23,137 GWh, up 3.7% from a year earlier.
Over the first eight months of 2026, cumulative demand reached 175,858 GWh, 2.8% higher than the same period in 2025. The adjusted growth rate stood at 1.7%.
Data centers alone don’t explain that trend, but they are emerging as one of the fastest-growing sources of demand among large consumers.
A 55% Increase That Still Starts From a Small Base
The most striking figure in the IRE is CNAE 63, the category covering information services, data processing, hosting, and related infrastructure.
In July, its consumption rose 55.1% compared with the same month in 2025.
The IRE for large consumers overall grew 4.2% year-over-year. Industry advanced 6.3% and services 0.8%.
CNAE 63 was the sector with the largest percentage increase, but not the one that contributed most to the rise in absolute demand.
Metallurgy, whose consumption is much larger, contributed around 2.1 points to overall growth despite advancing just 10.8%. CNAE 63 contributed about six-tenths of a point.
That distinction matters for reading the percentages correctly.
| Indicator | July 2026 |
|---|---|
| IRE, large consumers | +4.2% |
| Industry | +6.3% |
| Services | +0.8% |
| CNAE 63 | +55.1% |
| Metallurgy | +10.8% |
| CNAE 63 contribution to growth | ~0.6 points |
| Metallurgy contribution | ~2.1 points |
A 55% increase doesn’t mean data centers already consume more electricity than heavy, energy-intensive industries.
It means they’re starting from a smaller base and growing very fast.
Héctor de Lama, technical director at the Spanish Photovoltaic Union (UNEF), has flagged exactly that nuance: the IRE figures show relative changes, but CNAE 63 still doesn’t rank among the twenty sectors that consume the most electricity in absolute terms.
The trend, however, is starting to hold for long enough that it no longer looks like a one-off blip.
Consumption in this category has posted increases of roughly 40% to 77% for six straight months.
Part of that growth also comes from data centers whose construction began before the current wave of AI-driven investment.
That means a good share of the capacity announced during 2025 and 2026 isn’t yet fully reflected in current electricity consumption.
Spain Has Already Granted More Than 12 GW of Grid Access
The real scale of the debate becomes clear when looking at connection requests and permits.
Spain’s Ministry for the Ecological Transition says that since late 2023, the transmission grid operator has granted more than 6 GW of access capacity to data center projects.
On top of that, roughly another 6 GW have been granted on distribution networks since 2020.
Combined, the figure tops 12 GW.
That doesn’t mean Spain is about to have 12 GW of data centers up and running.
A grid access permit isn’t the same as a built data center.
Years can pass between securing grid capacity and going into operation, and some projects never materialize at all.
That gap between requested, granted, under-construction, and finally operational capacity is precisely one of the problems the new regulation is trying to address.
| Stage | What it means |
|---|---|
| Announced project | An investment intention exists |
| Access request | The developer requests grid capacity |
| Granted capacity | Access rights have been secured |
| Construction | The project is being built |
| Operation | The facility is actually consuming electricity |
The gaps between those stages can be enormous.
According to figures published by BauWatch, of more than 10 GW of projects announced in Spain and Portugal, around 1.2 GW are currently built or under construction.
That explains part of today’s apparent contradiction.
Consumption data still show a relatively small sector, while connection requests point to a much larger potential demand ahead.
The Government Wants 80% Renewable Backing Every Hour
The surge in these requests has pushed the government to draft a specific Royal Decree for data centers.
The draft sets obligations for facilities with access power equal to or above 1 MW, plus reporting requirements for centers with at least 500 kW of IT power.
The most contentious point concerns renewable energy.
Until renewable participation in Spain’s power system exceeds 90%, new data centers would need to cover at least 80% of their consumption with new renewable generation.
Buying annual guarantees of origin wouldn’t be enough.
The proposal also requires additionality and hourly correlation.
The new generation would need to have been installed within the 18 months before the data center starts operating, and in every hour of operation, at least 80% of the electricity consumed would need to match renewable energy generated during that same hour.
The government’s logic is to prevent the arrival of large, permanent new loads from forcing the system to ramp up natural gas generation or make grid investments whose costs end up passed on to other consumers.
The draft also includes efficiency requirements.
Until the future EU labeling system takes effect in August 2027, it proposes maximum values of PUE 1.15 and WUE 0.1 for energy efficiency and water use.
Why the Hourly Requirement Draws So Much Pushback
The industry sees the hour-by-hour renewable correlation as especially hard to meet.
A data center typically maintains fairly stable demand across all 24 hours.
Solar output, however, disappears at night. Wind output can vary considerably from hour to hour and day to day.
Maintaining 80% renewable coverage every single hour would require combining different technologies, storage, supply contracts, and possibly installed generation capacity well above the facility’s average consumption.
That’s one of the main criticisms from electricity trade associations and the data center sector itself.
The government, for its part, argues that this requirement is precisely what prevents large new consumers from joining the system by drawing on renewable generation during a few hours while relying heavily on fossil technologies once that output drops.
The positions aren’t entirely incompatible.
The discussion centers mainly on what percentage to require, how much flexibility to allow, and how much time to give projects to adapt.
The public comment period closed on September 10, 2026, and the government has received numerous submissions. Government sources say there’s room to modify some requirements while keeping the goal of preventing new demand from raising the electricity bill for the rest of consumers.
That closing followed months of industry pushback: Templus has called on the government to withdraw the draft decree entirely, while other operators have concentrated their objections on the renewable energy requirements themselves.
The €67 Billion Figure Isn’t Money Already Committed
One of the arguments the industry repeats most often is the figure of €67 billion.
It’s worth clarifying what that number actually represents.
SpainDC estimates the sector could mobilize around €66.9 billion in direct and indirect investment through 2030.
The association also estimated that installed IT power at commercial data centers could grow from 439 MW at the end of 2025 to around 2,537 MW by 2030.
That’s not €67 billion already invested, nor guaranteed contracts.
It’s a forecast produced by the trade association itself, under certain assumptions about how the market will develop.
SpainDC now argues that the regulatory draft could put a significant part of that investment at risk, and has called some of the requirements practically unworkable.
The organization even says some companies could reconsider projects if the Royal Decree is approved unchanged. That’s the industry’s own assessment, not confirmed cancellations of €67 billion.
The distinction matters because regulation can affect investment expectations without the entire projected amount automatically disappearing.
Spain Is Producing More and More Renewable Electricity
The debate is also playing out against a power system that’s rapidly increasing its renewable output.
In August 2026, renewable technologies generated 13,640 GWh, up 11% year-over-year, accounting for 53.6% of national electricity generation.
Including estimated self-consumption output, the renewable share rose to 55.1%.
Solar PV was the leading generation technology for the fifth month in a row, with a 29.2% share and 7,445 GWh produced during August.
| August 2026 generation | Share |
|---|---|
| Solar PV | 29.2% |
| Combined cycle | 20.7% |
| Nuclear | 18.6% |
| Wind | 13.3% |
| Hydro | 6.9% |
| Total renewables | 53.6% |
Redeia also estimates that self-consumption installations generated around 1,600 GWh during the month.
The system integrated another 954 GWh through batteries and pumped hydro storage.
These figures help explain why Spain is attractive to data centers: it has abundant solar and wind resources and growing renewable generation.
But they also point to the core of the regulatory problem.
Having plenty of renewable energy on an annual basis doesn’t mean having it evenly available every hour of the day.
Data Centers Can Help Soak Up Surpluses, But They’re Not Inherently Flexible
One of the main opportunities linked to data centers is their ability to boost electricity demand at a time when Spain is rapidly adding new renewable generation.
During certain hours, especially with high solar output, the system can have cheap electricity that doesn’t always find enough demand.
A new, permanent industrial consumer can help use up part of that surplus.
The problem is that a traditional data center doesn’t just run whenever there’s excess electricity.
Servers stay operational continuously.
Some AI workloads can shift temporarily between regions or times of day, but other applications need immediate availability.
That’s why the potential to act as a flexible consumer depends on the type of work each facility runs.
Model training or certain batch processes could adapt more easily to energy availability.
Real-time inference services, storage, enterprise cloud, or critical applications offer less room to maneuver.
That makes it hard to apply a single energy policy to every data center.
Current Consumption Isn’t the Main Problem Yet
The IRE data probably offer the most useful snapshot of where things stand today.
Data centers are growing extraordinarily fast, but they still represent a small share of Spain’s total electricity consumption.
The real challenge lies in the future trajectory.
Spain has more than 12 GW of granted access capacity across transmission and distribution networks for this type of facility, while commercial IT power installed at the end of 2025 was just 439 MW, according to SpainDC.
The two figures aren’t directly comparable, since one refers to electrical access capacity and the other to installed IT load, but the gap between them helps illustrate the volume of projects that could still be on the way.
CNAE 63’s 55.1% growth doesn’t prove that data centers currently threaten Spain’s power system.
It does show that demand that for years mostly showed up in applications, investment plans, and campus announcements is starting to show up on meters too.
The regulatory question now is how much of that growth the grid can absorb, what costs developers should bear, and what conditions should apply to avoid passing them on to the rest of the system.
Spain has a clear advantage: abundant renewables, international connectivity, available land, and developed electrical infrastructure.
It also has an equally clear physical limit: grid capacity isn’t infinite.
The debate over data centers is no longer just about how many projects Spain can attract, but about how many can actually be connected, and under what conditions, without turning the new digital economy into a problem for the rest of the country’s electricity consumers.
