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. Madrid also hosts the Observatorio Cubano de Derechos Humanos (OCDH), the principal external monitor of Cuban prisoner-of-conscience cases, which co-signed the Acuerdo de Liberación handed to EU Special Representative for Human Rights Kajsa Ollongren in Brussels on 13 May 2026.

Spain's CNMC opened 63 proceedings on 23 April 2026 against operators implicated in the April 2025 Iberian blackout. Investigated entities include Iberdrola, Endesa, Naturgy, Repsol, TotalEnergies, Engie, ContourGlobal, and the Asco-Vandellos nuclear association, alongside 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. EDP (Portugal) denied any role, stating its Soto de Ribera plant 'was not even scheduled to be operating' at the time. Proceedings are expected to run 9-18 months.

Spain's day-ahead electricity market cleared at EUR 69.23/MWh on 12 May 2026 — EUR 54 below Hungary's EUR 123.23/MWh clearing on the same day, confirming Spain's structural position as the EU's lowest-clearing major electricity market. Spain's high renewable penetration (wind and solar exceeding local demand in key regions) and Iberian grid isolation from Continental Europe explain the persistent discount. 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+UK total.

The CNMC blackout investigation creates regulatory uncertainty for Spain's energy sector at a moment when the grid operator (REE) faces a 'very serious' infraction charge. The combination — blackout liability, regulatory proceedings, and concurrent energy crisis fiscal exposure — makes Spain's energy governance the most contested in the EU heading into winter 2026-27. ACER also named Spain in its 6 May derogation opinions for EU gas network codes at third-country interconnection points, effective 5 August 2026.