The hosting capacity is calculated and published monthly on the TSO (Red Eléctrica) and DSO websites in accordance with legal requirements. The published information reflects the available capacity across the entire transmission and distribution grids, respectively, and is detailed at the substation level. Additionally, Red Eléctrica (RE) publishes the cumulative power of open connection requests. 

The calculation for the transmission network is based on grid simulations aligned with the National Development Plan. The published hosting capacity is independent of switching bay availability. 

Legal validity: The information provided in the hosting capacity map is non-binding. To reserve or acquire connection capacity, a formal connection request must be submitted. 

For further information regarding capacities, please contact customer managers or submit a formal connection inquiry. Additional details are available on RE’s website: https://www.ree.es/es/operacion/desarrollo-sistema/acceso-conexion-red. 

In April 2026, the NRA (CNMC Comisión Nacional de los Mercados y la Competencia) launched a publicly available website where capacity information for both transmission and distribution electricity grids, as well as for demand and generation requests is monthly updated, as well as concerning the whole national territory (including mainland and island territories): https://www.cnmc.es/sectores-que-regulamos/energia/supervision-del-merc…

Regarding the information for the DSO hosting capacity maps, the links for the main DSOs are the following:

            e-distribución: 

• Generation: https://www.edistribucion.com/en/red-electrica/nodos-capacidad-red/capacidad-generacion.html  

• Demand: https://www.edistribucion.com/es/red-electrica/nodos-capacidad-red/capacidad-demanda.html  

  i-DE: 

• Generation: https://www.i-de.es/grid-connection/energy-generation/capacity-map  

• Demand: https://www.i-de.es/conexion-red-electrica/suministro-electrico/mapa-capacidad-consumo 

  e-redes: 

• Generation: https://www.eredesdistribucion.es/mapa-interactivo-de-la-red  

• Demand: https://www.eredesdistribucion.es/mapa-interactivo-de-la-red  

  UfD: 

• Generation: https://www.ufd.es/generacion/  

• Demand: https://www.ufd.es/demanda/