La nuclear power generation In Argentina, he has broken his own record again. And it closes 2025 with an all-time high, marking two consecutive years of growth and consolidating its position as one of the pillars of the country's electricity supply. This performance reinforces the role of nuclear power as a baseload source, capable of providing stability in a context of increasing demand and an ongoing energy transition.
According to data released by Nucleoelectrica Argentina SA (NA-SA)The majority state-owned company responsible for operating the Atucha I, Atucha II and Embalse power plants achieved a net annual generation of 10.760.572 MWhThis figure exceeds 10.449.015 net MWh registered in 2024This confirms an upward trend and places nuclear energy at around 7,5% of national electricity demand.
A new all-time high for Argentina's nuclear power plants
The last fiscal year ended with a absolute record of nuclear electricity productionThis success is based on the high availability of the three power plants and the optimization of their load factors. The company emphasizes that these results are the product of a combination of planned maintenancerigorous technical management and high safety standards, key to ensuring a continuous and predictable supply.
In operational terms, the improvement compared to 2024 means more than 300.000 additional MWh generatedThis represents a significant volume within the Argentine electrical system. This increase is primarily associated with the performance of the highest power plants. Reservoir and Atucha II, who in 2025 also recorded their best individual records since entering service.
The position of nuclear energy as a baseload power source It takes on special relevance when it functions in a complementary way to the variable renewable energieslike wind or solar power. While these depend on weather conditions, nuclear power plants provide a constant flow of electricity, which facilitates the operation of the system and reduces the need for fossil fuel backup.
The energy sector emphasizes that, in addition to its stable nature, nuclear power is a technology low greenhouse gas emissionsThis makes it a useful tool within decarbonization strategies. Although this debate is more advanced in Europe, with countries like France, Finland, and Spain itself reviewing the role of nuclear power in their energy mixes, the Argentine experience is seen as a practical case study of how to maintain an existing fleet of nuclear power plants operating at high levels of efficiency.
Records at Embalse and Atucha II: the power plants that are pulling the cart
The 2025 annual peak is not just a joint milestone for the nuclear fleet: it also holds true in record-breaking records at two of the three power plants in service. The Reservoir Nuclear Power Plant, located in the province of Córdoba, reached a net generation of 5.352.203 MWh, surpassing its previous record of 5.224.058 MWh of 2023This improvement demonstrates the positive impact of the modernization efforts and operating strategies implemented following its life extension.
For its part, the Atucha II Nuclear Power PlantLocated in the province of Buenos Aires, the company closed the year with a production of 5.408.370 MWh net, above its previous high of 5.200.490 MWh reached in 2016This leap reaffirms Atucha II's role as one of the main sources of baseload power generation for the system, with an operation that, according to the company, is sustained by high load factors and operational stability.
The combined performance of Embalse and Atucha II demonstrates that investments in maintenance, technological upgrades and asset management These measures can translate into sustained increases in power generation without the need to build new power plants. This approach is being followed with interest in other countries, including European Union member states, where discussions are underway on how to extend the lifespan of existing facilities and make the most of already amortized infrastructure.
In practice, the new record reflects that Argentine power plants have been able to operate for long periods without significant interruptions, something that in the nuclear field is directly linked to strict inspection programs, established safety procedures, and specialized technical teamsThe company emphasizes that, beyond the numbers, the main objective remains the safety of people and the environment.
This continued performance also provides a signal of stability to the Wholesale Electricity Market (MEM), where NA-SA sells the energy it produces. The presence of a robust baseload source allows moderate price volatility associated with other technologies, an issue that, apart from market differences, is familiar to European electricity operators.
Atucha I: life extension for two more decades of operation
The generation record comes in parallel with a series of strategic projects aimed at ensuring the future of Argentina's nuclear fleet. Among them stands out the Atucha Life Extension Project I, considered one of the most important energy infrastructure initiatives in the country.
Atucha I, Latin America's first nuclear power plant, is currently in a long scheduled shutdown to undertake modernization work and replacement of key components. One year after the start of this shutdown, the project presents a 48% progress, with significant progress in updating systems essential for safety and operation.
The goal is clear: that the power plant can continue operating for at least an additional 20 yearsMaintaining the most demanding international standards for nuclear safety and radiological protection. This approach is similar to that followed in several European countries, where extending the life of existing power plants is considered an option to strengthen security of supply while developing new renewable energy capacity.
The works include both interventions in the nuclear island such as improvements in the plant control, instrumentation and management systemsNA-SA emphasizes that these works not only aim to extend the plant's lifespan, but also to incorporate updated technologies and more modern design criteriaThis aligns with the recommendations of specialized international organizations.
Once the life extension project is completed, Atucha I will be fully reintegrated into the operation of the Argentine electrical system, providing firm power that is considered key to to support the development of renewable energies and reduce dependence on imported fossil fuels, an issue that is also a concern in much of Europe.
Nuclear fuel management: dry storage at Atucha II
Along with extending the lifespan of nuclear power plants, another central focus of Argentina's nuclear policy is the safe and responsible management of used fuelThis is the context in which Spent Fuel Dry Storage Project (ASECG II) in Atucha II, which already registers a 38% progress.
This project involves the implementation of a dry storage solution for spent fuel, a technology already used in many countries that allows decongest the storage pools located at the power plants themselves. This ensures the plant's operational continuity while reinforcing the long-term safety of the nuclear materials.
The dry storage system is based on special containers designed for Keep the fuel isolated and cooled without the need for complex active systemsThis option is considered robust from a safety point of view and facilitates the future management of high-level radioactive waste, in line with the requirements established by regulatory bodies and international benchmark standards.
In the European context, several countries have opted for similar solutions for optimize the management of spent fuelThis applies both to operating power plants and facilities undergoing closure. The Atucha II experience thus adds to a series of cases demonstrating that combining pool storage and dry storage is an effective tool for managing the fuel cycle while discussions on long-term, definitive solutions continue.
According to Nucleoeléctrica, the progress of the ASECG II project is key not only from a technical point of view, but also as a sign of commitment to safety and environmental careThese are two aspects that usually focus the public debate surrounding nuclear energy, both in Argentina and in the rest of the world.
Nuclear plan, energy security and a look towards Europe
The good operational performance and the progress of the strategic works are framed within a long-term roadmap for the Argentine nuclear sectorThe company is chaired by Demian Reidel, a physicist trained at the Balseiro Institute and a PhD in Economics from Harvard University, who is listed as the author of the so-called Argentine Nuclear Plan, a document that outlines the guidelines for the development of the sector in the coming decades.
The company emphasizes that the record generation in 2025 reinforces the position of nuclear energy as efficient, reliable and low-emission sourcecalled upon to support economic growth and increased electricity demand. The role of power plants as part of so-called "baseline energy" is presented as a central element to ensure the country's energy security.
In Europe, where the debate on green taxonomy, climate neutrality, and the closure or continued operation of nuclear power plants remains very much alive, the Argentine case provides an example of how a consolidated nuclear power plant can to continue increasing its production through technical improvements and life extension projectsCountries such as France, Sweden, and Finland have advocated a similar approach, while others, such as Germany and Spain, have opted for a gradual closure schedule, although in the Spanish case adjustments are not ruled out depending on the future needs of the system. The European pulse puts these decisions into context.
Beyond the political decisions of each country, the evolution of Argentina's nuclear program demonstrates that the combination of safety, maintenance, and long-term planning This could translate into a greater contribution of this technology to the energy mix without the need for new reactors in the short term. This aspect is of particular interest for European debates on the costs, investment, and deployment times of new infrastructure.
Domestically, Nucleoeléctrica Argentina insists that the focus remains on to ensure safe and sustainable operationsThe aim is to consolidate ongoing projects and analyze the feasibility of future power plants that could be expanded or added to the existing fleet. All of this, they point out, is with a view to a more robust and diversified electricity system that is compatible with the emissions reduction targets that are also shaping the agenda in the European Union.
The 2025 balance sheet thus paints a clear picture: Argentina's nuclear power plants have reached their highest generation level in historyDriven by the Embalse and Atucha II brands and supported by structural projects such as the life extension of Atucha I and dry storage at Atucha II, nuclear power, contributing close to 7,5% of electricity demand and operating based on safety and reliability criteria, remains a key component of the national energy system and a case to be closely followed in Spain and the rest of Europe, where the discussion about the role this technology should play in the coming decades continues.
