Around 10.5 gigawatts of data centre capacity has been announced across the Iberian peninsula. Only about 4.5 gigawatts counts as active, meaning it is attached to an identifiable project with institutional capital behind it and a developer capable of building it. The other six gigawatts are announcements.
The binding constraint is not money and it is not land. It is grid capacity, network access and permitting, which are three different problems that arrive in sequence and each take years. A developer can close financing in months and then wait considerably longer for a connection point that physically exists.
Spain became attractive to this industry for good reasons. Electricity is comparatively cheap, the generation mix is unusually renewable, and the land is available at prices that would be unthinkable in Frankfurt or Dublin. Those advantages are real and they are all downstream of a grid that was not built with gigawatt scale single sites in mind.
The mismatch matters because announced capacity does policy work. Regional governments plan around it, suppliers hire against it, and the national conversation about whether Spain is becoming a compute hub treats the 10.5 figure as though it were a pipeline rather than a wish list.
The honest version is that Iberia has a genuine structural advantage and a genuine infrastructure bottleneck, and the second one will decide how much of the first turns into anything. Watching connection queues is a duller activity than watching announcements and a far better predictor.