Ampervia CapitalBy Razvan Toma · Founder & CEO, Ampervia · Last checked 2026-10-12 · Sources linked below
Capacity exists, but rarely where data centers queue. In the CNMC’s August 2026 data, 816 of 6,186 Spanish distribution nodes publish any demand capacity, and only 104 offer 20 MW or more. Madrid has 9 such nodes and no transmission node with demand capacity, while provinces such as Lugo, Murcia and Asturias publish far more. Sources (3)
CNMCCNMC — access capacity map↗
YeandelYeandel — Spain granted twelve, planned four↗
BOEBOE — Real Decreto-ley 7/2026↗
Key facts
- 816 of 6,186 distribution nodes publish demand capacity; 200 offer ≥10 MW and 104 offer ≥20 MW (CNMC, August 2026; Ampervia aggregation).
- Open distribution nodes fell from 862 in June to 816 in August 2026.
- 290 of 937 Red Eléctrica transmission nodes show demand capacity in at least one published category; none of Madrid’s 91 do.
- About 12 GW of grid access has been granted to data centers in Spain: more than 6 GW on transmission since end-2023 and around 6 GW on distribution since 2020, against a 2030 demand forecast of 3.5–4 GW (Yeandel, citing official figures).
Where to look
The province table at Spain grid capacity by province ranks all provinces by published demand capacity, with the number of nodes at 10 and 20 MW and the change since June.
Why granted capacity does not mean free capacity
Much of the ~12 GW already granted sits with projects that may never be built. RDL 7/2026 now ties each permit to a declared activity and adds a capacity-reservation charge payable from the permit until activity starts, which should push unused permits back to the grid over time.
Questions
Is published capacity a connection offer?
Why is Madrid so constrained?
Sources
Terms on this page: Access capacity · Node · Distribution grid · Transmission grid · Access and connection permit