Summary
- Krolmap proposes six data centre buildings on a 25-hectare site at Belchite.
- A combination of renewable generation, storage, and cogeneration would provide electricity without a conventional grid connection.
- The scheme remains a proposal, with generation sizing, storage duration, fuel arrangements, and continuous supply performance still to be demonstrated.
Spanish engineering company Krolmap is proposing a 225MW data centre campus at Belchite, Zaragoza, designed to operate without a conventional electricity grid connection.
The €1.5 billion proposal would occupy approximately 25 hectares at the La Legua industrial estate and comprise six separate data centre buildings. Krolmap intends to support the development with renewable generation, battery storage, and cogeneration.
The scheme was reported on 18 October as a potential alternative to the conventional approach of securing a large transmission or distribution network connection before commissioning a data centre.
Krolmap’s proposed energy system is intended to provide electricity throughout the day and night. However, the publicly available project description does not establish whether its planned generation and storage capacity can reliably sustain the complete 225MW development under all expected operating conditions.
The company is also pursuing a separate data centre development at Villanueva de Gállego, another location in Aragón. The Belchite proposal is distinct because of its intended independent electricity supply.
Neither the proposed investment figure nor the stated capacity establishes that construction has begun, financing is complete, or the facility has obtained the approvals required to operate.
Available reporting also does not define whether 225MW represents intended IT load, total facility demand, or another measure of electrical capacity. The figure should therefore be treated as proposed project capacity, not installed or operational power.
Independent supply introduces additional engineering requirements
A large data centre operating independently of the public electricity network must maintain a continuous balance between generation, electricity storage, and demand.
Renewable generation can provide substantial electricity over a year, but output varies according to weather conditions, technology, and the installed generating capacity. Solar production follows daylight availability, while wind output fluctuates with meteorological conditions.
Battery storage can absorb surplus electricity and discharge it when renewable output is insufficient. The energy available depends on storage capacity measured in megawatt-hours, rather than the battery’s maximum discharge rating alone.
The distinction becomes particularly important for a facility drawing a large continuous load. A battery rated at 100MW, for example, cannot be assumed to deliver that output for any specified number of hours without knowing its usable energy capacity.
Cogeneration could provide a controllable source of electricity alongside recoverable heat. Its performance and environmental impact would depend on the generation technology, fuel, electrical efficiency, and opportunities to make use of the associated thermal energy.
Krolmap has not disclosed sufficient detail to establish the fuel arrangement, the installed generation capacity, the storage duration, or how the different components would be dispatched.
Continuous operation would also require suitable controls to maintain voltage, frequency, and power quality as computing equipment and cooling systems change their demand.
Redundancy presents another design requirement. If a major generating unit becomes unavailable, the remaining equipment must support critical loads or the facility must reduce its operating demand in a controlled manner.
Scheduled maintenance, prolonged periods of weak renewable generation, and equipment failures all influence the amount of reserve capacity needed.
Grid independence does not eliminate infrastructure costs
Spain has attracted substantial interest in data centre development, supported by renewable energy investment, international connectivity, and the availability of sites suitable for large industrial projects.
Electricity connection constraints nevertheless affect where proposed campuses can be built and how quickly they can begin operating. Access to inexpensive land does not guarantee that a network operator can supply the required electrical load.
An independently powered development could avoid some of those connection constraints, but the project would instead need to finance, permit, construct, and maintain its own electricity supply infrastructure.
That would include generation equipment, storage systems, electrical protection, control systems, and the infrastructure needed to move electricity between those assets and the computing facilities.
Cooling demand must also be included in the energy balance. Pumps, chillers, fans, and heat rejection equipment can add substantial electricity consumption, depending on the computing density and thermal design.
The Belchite proposal does not yet provide enough detail to determine its cooling technology, water requirements, or whether useful heat from cogeneration would be recovered within the campus.
Project economics would depend on the balance between generating equipment costs, fuel and maintenance requirements, storage replacement, and the expected utilisation of computing infrastructure.
Independent electricity production may offer greater control over the supply arrangement, but it does not automatically provide lower costs or environmental impacts than an appropriately connected facility.
The scheme also faces a changing regulatory environment. Spain has been developing additional data centre oversight requirements, with resource consumption and sustainability among the issues under consideration.
Any permissions for the proposed generating equipment would need to be considered alongside approvals for the buildings, environmental effects, and other supporting infrastructure.
Until a detailed engineering design and project timetable are published, the proposed energy model cannot be assessed against the availability requirements of prospective commercial occupiers.
Belchite’s progress will therefore depend on demonstrating not only that sufficient electricity can be produced over time, but that its supply remains dependable during the most demanding combinations of weather, maintenance, and computing load.
