Spain Extends Largest Nuclear Plant Amid Energy Security Concerns

Spain’s left-wing government has extended the operating life of the country’s largest nuclear plant in a policy change aimed to reduce dependency on unstable energy markets.

“The limited extension during this period makes a temporary contribution to mitigating the exposure of the electricity system and Spanish consumers to previously unforeseen price spikes,” a ministerial order read.

Renewable energy and storage will continue to be “structural solutions to the exposure and vulnerability that the external dependence on fossil fuels represents,” it added.

The plant, which is located in the western region of Extremadura, was due to close in 2028 as part of the government’s plan to shut all nuclear reactors by 2035 and focus on renewables. But the three Spanish firms that own the site—Iberdrola, Endesa, and Naturgy—asked the government last year to allow Almaraz to remain in service for another two years. The proposal was considered after the unprecedented nationwide blackout from 2025 and soaring energy prices caused by the war in Iran.

The decision to extend Almaraz plant’s operations until June 2030 was condemned by Sumar, a left-wing party that is a junior member of the ruling coalition. Sumar called it a decision based on “corporate pressure and not technical and environmental needs or economic competitiveness.” But the government previously said any extension would not impose additional costs on taxpayers and would not “alter the rest of the timetable,” including the nuclear phase-out by 2035.

The Almaraz extension signals that energy security and price stability are beginning to outweigh Spain’s previous commitment to a fixed nuclear phase-out timetable, reflecting a broader European reassessment of nuclear power. The key question is whether this remains a one-off extension or becomes the start of a wider policy shift. Investors and policymakers should watch for decisions on Spain’s other reactors, as well as the government’s response to energy prices, grid reliability, and coalition pressure over the coming months.