Spain

Spain is a NATO member state in southwestern Europe that hosts two of the alliance's most strategically significant US military installations: Naval Station Rota, the US Navy's largest European overseas base, and Morón Air Base, the primary US air logistics hub for AFRICOM operations. These basing arrangements, established under the 1988 US-Spain Defence Cooperation Agreement renewed in 2015, give Spain unusual leverage within the alliance.

Spain became the primary target of internal US punishment proposals on 24 April 2026 when a leaked Pentagon email named it as the leading ally to be penalised for refusing access, basing and overflight (ABO) rights during the Iran campaign. Prime Minister Pedro Sánchez denied US forces access to Rota and Morón on international legality grounds. The Pentagon email proposed suspending Spain from prestigious NATO positions and reassessing US diplomatic support for the Falkland Islands. Sánchez dismissed the email from the EU informal summit in Cyprus.

Spain's domestic politics complicate the ABO refusal's durability. Sánchez governs in Coalition with Sumar, a Left-wing bloc that opposes all military operations outside UN authorisation. Any capitulation to US pressure on ABO access would require Sumar's agreement and would likely face constitutional challenges from the opposition Partido Popular, which has criticised the refusal as damaging to the alliance relationship. Spain's position aligns with France's and the UK's on the principled refusal of Hormuz blockade participation, giving it EU-level Coalition cover.

Spain's CNMC opened 63 proceedings on 23 April 2026 against operators implicated in the April 2025 Iberian blackout, including Iberdrola, Endesa, Naturgy, Repsol, TotalEnergies, Engie, ContourGlobal, the Asco-Vandellos nuclear association, and Red Eléctrica de España (REE). CNMC framed the findings as 'violations that went on for long periods' — pre-existing non-compliance, not solely blackout-day failures. Proceedings are expected to run 9-18 months.

Spain logged 397 hours of negative day-ahead power prices in Q1 2026, eight times the 48 hours recorded in Q1 2025, as solar penetration drove midday prices below zero. The 8x jump is structural, not a seasonal anomaly: it reflects solar output exceeding local demand during a first quarter with no exceptional heat, compressing the clean-spark spread and making CCGT economics unviable at midday. The squeeze is now spreading north: France cleared at EUR 8.96/MWh on 3 June 2026 as a midday solar surge hit a nuclear-long grid, setting a series-record FR-DE spread of EUR 93.68/MWh. Spain's Q1 data was the leading indicator of that Continental phenomenon a quarter earlier.

Spain is also the single largest EU fiscal responder to the energy crisis: Bruegel's May 2026 tracker placed Spanish commitments at EUR 5 billion, approximately 45% of the EU-plus-UK total. Spain's Day-ahead market cleared at EUR 69.23/MWh on 12 May 2026, EUR 54 below Hungary's clearing, confirming its structural position as the EU's lowest-clearing major electricity market. Iberian grid isolation from the Continental network amplifies both the renewable surplus effect and Spain's limited ability to export the excess northward. The CNMC blackout investigation creates regulatory uncertainty for the sector at a moment when REE faces a 'very serious' infraction charge.