Krolmap plans €1.5bn, 225MW off-grid data center in Belchite

Scope and disclosed design

Krolmap plans a 225MW off-grid data center campus on 25 hectares in Belchite, Spain, in a project reportedly valued at €1.5 billion ($1.68 billion).

The Aragón-based engineering firm would locate the campus in the La Legua industrial park. Its design includes six independent buildings. A shared on-site energy system would serve the facilities.

Heraldo de Aragón published the available information. The proposal uses a self-consumption model. This would reduce reliance on the public grid.

• Planned campus capacity: 225MW
• Reported project value: €1.5 billion ($1.68 billion)
• Site area: 25 hectares
• Layout: six independent buildings

Energy architecture

Renewables, battery storage and cogeneration would form the energy core. Together, they would meet the campus's continuous demand.

Renewable generation and storage would provide campus electricity. Storage would also help balance output against consumption. Cogeneration would add another controllable source on site.

The published information identifies no renewable technology types. It gives no generation capacity or battery storage capacity. Technical specifications for the cogeneration system are also absent.

Because the stated model is self-consumption aimed at reducing grid dependence, the available information does not confirm whether the campus would remain permanently disconnected from the wider electricity network. “Off-grid” describes the proposal's headline concept. The final supply arrangement remains unresolved.

Capacity and unresolved system sizing

The 225MW figure applies to planned campus capacity. No matching total appears for on-site generation, battery power or stored energy. That distinction matters because the campus must meet continuous demand. Renewable output must be balanced with storage and cogeneration. The proposal does not explain how this balance would work over time.

Without technology choices, equipment capacities and a final connection arrangement, the available data cannot show whether the system would provide the intended level of continuous power.

Why power availability matters

The proposal addresses one of the main constraints on large data center development in Spain: the availability of electrical power, especially in areas where grid access is limited.

On-site generation can offer an alternative. This model does not remove the power constraint. It shifts responsibility to the developer. The developer must size and operate the energy system. The system must sustain critical loads.

That changes the development task. Power availability becomes part of the campus design. Storage and continuous operation sit inside the same project.

What does this change for Spain’s data center developers?

It offers developers in grid-constrained locations a route to pursue large campuses through dedicated on-site generation, although the 225MW Belchite proposal remains a planning concept rather than an operating facility.

Power-system execution becomes part of the data center project. The developer must secure enough generation and storage. Those systems must protect critical loads. The model does not rely on grid supply alone.

The final cost structure, construction sequence and schedule remain unavailable. Final architecture and development timeline remain undisclosed.

Missing data include technology selection, generation capacity, battery capacity and cogeneration configuration. Grid-connection arrangements remain undefined. These gaps affect system scale and operating requirements.

A second Aragón proposal

Krolmap is also planning another data center project in Villanueva de Gaállego, Aragón, but the available information provides no capacity, investment figure, site size, technical design or development timetable.

Only Belchite has disclosed headline specifications. The Villanueva de Gaállego proposal lacks comparable data.