The Spanish government’s authorization for the Almaraz nuclear plant to keep operating until 2030 has ignited a major dispute within the ruling coalition. Sumar, the junior partner, condemned the decision as a breach of the coalition agreement and a concession to energy-sector interests. The authorization covers both reactors at the Cáceres facility and sets 8 June 2030 as their new operational limit.
Under the coalition pact signed by Pedro Sánchez and Yolanda Díaz in October 2023, the government committed to a phased, socially just closure of Spain’s nuclear plants. Almaraz’s two units had been scheduled to shut down in October 2027 and November 2028; the new deadline extends their operation by roughly three years. Sumar has built much of its political identity around ambitious green policies and a clear break from PSOE’s approach. The decision challenges a basic commitment secured during coalition negotiations.
Sumar’s leadership voiced “absolute disagreement” with the extension, warning that it represented a deep rupture in government consensus. The party accused Sánchez of aligning with right-wing positions by allowing the plant to continue operating. The dispute has raised questions about how the decision was handled within the coalition and whether Sumar was consulted before its announcement.
Izquierda Unida, a basic force within Sumar, called the extension a mistake that breaks the government’s roadmap and conflicts with its renewable-energy goals. IU leader Antonio Maíllo warned that Almaraz could set a precedent for further extensions and called for a strategy to prevent similar decisions at other plants. The authorization does not, by itself, cancel Spain’s wider nuclear phase-out structure: the 2023 to 2030 National Integrated Energy and Climate Plan retains a staggered closure schedule extending into the first half of the 2030s, based on a timetable agreed in 2019.
Any operation beyond June 2030 would require a separate process, not an automatic renewal. The plant’s owners would need to prepare a new application, with preparatory work expected to begin in 2027 and a formal request due before the end of the first quarter of 2029. The Consejo de Seguridad Nuclear (CSN) would assess the plant’s technical and safety case, while the Spanish Government would make the final decision. Meanwhile, Almaraz continues to maintain a department responsible for planning dismantling and decommissioning. Shutdown preparations remain in place alongside plans for continued operation.
The extension has also prompted operational and staffing preparations. Plant sources have described a recruitment and training program involving more than 60 workers; six people had been preparing for control-room operator licenses since late 2025, with licensing expected in 2028. Foro Nuclear president Marta Ugalde has argued that keeping Almaraz online would cut gas consumption by 7% and support grid stability without slowing renewable deployment. Those are the nuclear industry’s arguments for the extension, not a change to the national closure calendar.
The nuclear debate in Spain has intensified following the major blackout of 2025. Opposition parties such as PP and Vox have used the incident to argue for continued nuclear generation, while the Almaraz decision has become a test of the coalition’s ability to maintain its green agenda. The issue now joins a growing list of internal disputes, from corruption and housing to defense and labor reforms.
The coalition agreement’s section on the “green agenda for today and tomorrow’s sustainability” promised a planned nuclear phase-out under the Just Transition Strategy, with safety and social fairness built in. Sumar views the Almaraz extension as undermining that commitment; the government’s authorization, but, applies to this plant and does not itself rewrite the wider national timetable. Extremadura President María Guardiola defended the continuation as “a responsible decision, not a whim” and argued that abandoning nuclear generation would add more than €200 to household electricity costs. That figure is her political claim.
For additional context, recent crises have shaped the debate over Spain’s energy infrastructure. The 2025 blackout prompted regions like Catalonia to introduce rapid-response measures to restore impressive services. For example, Catalonia recently deployed a mobile unit to restore phone coverage during emergencies, highlighting broader challenges facing the country’s energy and communications networks.
Spain’s nuclear sector includes several plants with staggered closure dates. Any future application to extend Almaraz beyond 2030 would require a fresh technical assessment and government decision, but the dispute has already reopened the political debate over whether the wider timetable should remain fixed. Its outcome could shape future nuclear decisions and coalition stability, with consequences for regional economic interests.
