Ampervia CapitalBy Razvan Toma · Founder & CEO, Ampervia · Last checked 2026-10-12 · Sources linked below
In Castellón/Castelló, 5 of 84 distribution nodes (6%) publish available demand capacity, 15.3 MW in total (August 2026, CNMC). 0 offer 10 MW or more and 0 offer 20 MW or more; the largest single node shows 8.5 MW. 
CNMC
Castellón/Castelló against Spain
| Measure | Castellón/Castelló | Spain |
|---|---|---|
| Distribution nodes | 84 | 6,186 |
| Nodes with demand capacity | 5 | 816 |
| Nodes ≥10 MW | 0 | 200 |
| Nodes ≥20 MW | 0 | 104 |
| Available demand capacity (MW) | 15.3 | 7,078.1 |
| Largest node (MW) | 8.5 | — |
| Change in open nodes since June 2026 | -2 | -46 |
| Transmission nodes with demand capacity | 0 of 11 | 290 of 937 |
What this means for a data center
No distribution node in Castellón/Castelló publishes 10 MW or more of demand capacity. A data center here would need a transmission-level connection, grid reinforcement or a much smaller load.
Since March 2026, a Spanish demand access permit is tied to the CNAE activity code declared in the request (RDL 7/2026), so the request has to be filed as a data center from the start.
Method
Source: the CNMC’s national access-capacity service, layers Demanda en Distribución and Demanda en Transporte, publication period August 2026, pulled by Ampervia on 2026-10-12. Comparison period: June 2026.
- Distribution: each node’s published available capacity (CAP_DISPONIBLE, MW) for new demand, summed and counted by province.
- Transmission: a Red Eléctrica node is counted as showing demand capacity if any of its published demand categories is above zero.
- Province names are as published by the CNMC. Ampervia does not publish node or municipality detail.
- Published capacity is indicative and changes as permits are granted, lapse or are surrendered. Only the network operator can confirm capacity for a specific request.
Sources
- CNMC — national map of access capacity for demand (distribution and transmission layers)
- BOE — Real Decreto-ley 7/2026, de 20 de marzo (access permits and CNAE code)