Latin America's SMR Market: The Entry Window Is Open. The Timeline Is Not Forgiving
Latin America's relationship with nuclear energy has historically been shaped by the gap between goal and execution. Renewables have made significant inroads, but cannot provide the firm, round-the-clock baseload that heavy industry and fragile grids require. Hydropower, the backbone of the region's clean energy story for generations, is increasingly exposed to the droughts and hydrological variability that climate change is intensifying. The result is a structural energy problem that existing technologies are not fully solving. Small Modular Reactors are not being pursued across Latin America because they are fashionable. They are being pursued because the region has three specific structural constraints that SMRs are better positioned to address than any alternative currently on the table.
The Three Structural Constraints
The first constraint is geography. Latin America is characterised by vast distances, rugged terrain, and national grids that in many countries are either fragmented or localised. Conventional large reactors, which generate over 1,000 MWe, require high-voltage transmission infrastructure capable of absorbing a sudden loss of generation at that scale. Building that infrastructure across the Amazon basin, the Andes corridor, or the northern mining belts of Chile and Peru is not economically viable. SMRs, with their smaller power output and modular footprint, can integrate into existing grid nodes without requiring the transmission overhauls that large plants demand. In the most remote locations, they can operate entirely off-grid, which no large reactor can practically do.
The second constraint is industrial decarbonisation. Latin America's mining, steel, and petrochemical sectors are among the most carbon-intensive in the world, and they are also among the most economically important. Solar and wind power have successfully penetrated residential and commercial electricity markets, but they cannot provide the firm, continuous power that industrial processes require. Capacity factors for solar sit between 20–25%, and for wind between 30–40%. SMRs operate at capacity factors exceeding 90%. For a copper mine in northern Chile, an iron ore operation in Brazil's Pará state, or a petrochemical complex in Mexico requiring uninterrupted high-temperature process energy, that difference is not a marginal preference. It is an operational requirement.
The third constraint is capital risk. The financing history of large nuclear projects in Latin America is one of cost overruns, schedule delays, and fiscal strain. Brazil's Angra 3, currently around 62% complete, has been under construction for decades. Argentina's nuclear programme has faced repeated budget cycles that interrupted project continuity. SMRs change this by shifting a significant portion of construction to factory settings, compressing construction schedules, and allowing capacity to be added incrementally rather than committed in a single enormous bet. US EXIM Bank financing frameworks, including the Engineering Multiplier Program, provide structured entry pathways for qualifying SMR projects.
Where the Programme Stands Country by Country
Argentina holds the strongest near-term deployment trajectory. The CAREM-25, a 29 MWe prototype integral pressurised water reactor with construction underway at the Atucha site since 2014, has faced repeated delays including a budget-driven suspension in September 2024. More significantly, in March 2025 the chairman of the council of advisors to President Milei confirmed plans to install four ACR-300 Small Modular Reactors at Atucha, delivering a combined 1.2 GW capacity with the first unit targeted for 2030. The ACR-300 design has been developed by INVAP, Argentina's technical project company, which already holds a track record of research reactor deliveries across multiple continents. It is important to note that the ACR-300 remains at an early engineering stage, and independent experts have questioned the feasibility of a 2030 timeline; the political commitment is strong, but the technical development pathway is still being defined.
Brazil is approaching SMRs from two directions simultaneously. Its National Energy Plan 2050 envisions a fivefold increase in nuclear capacity to 10 GW, and SMRs will have a major role. In June 2025, Indústrias Nucleares do Brasil and the National Nuclear Energy Commission launched development of a 3 to 5 MWe microreactor designed to be transportable in a 40-foot container and capable of operating for over ten years without refuelling. This unit targets remote mining sites and isolated Amazonian communities, precisely the geography where grid connection is either impossible or prohibitively expensive.
Mexico's position is more deliberate. The Federal Electricity Commission (CFE) has been engaged in SMR feasibility discussions and the National Institute for Nuclear Research (ININ) has conducted active research into advanced reactor designs. No formal public commitment to a deployment timeline has been made, but Mexico's existing grid infrastructure and industrial base position it as a credible near-term market as policy frameworks mature.
Who Is Best Positioned to Lead
Argentina holds the strongest position for regional technology leadership. INVAP's track record as a reactor exporter, combined with the ACR-300's indigenous development, positions it as the natural source of a regional standard for South American nations that want a credible non-superpower technical partner. If the Atucha deployment proceeds, Argentina will become the first country in Latin America to operate a domestically designed SMR at commercial scale, a reference position with significant influence over subsequent regional procurement decisions.
Brazil is positioned to lead the microreactor and remote application segment. Its Amazon geography, its dominance of the regional uranium fuel cycle, and its June 2025 microreactor programme make it the natural first mover for the most isolated deployment contexts.
The international vendor competition is active and will intensify as procurement windows approach. US vendors including NuScale and Westinghouse are backed by the State Department's FIRST programme and EXIM financing tools. Rosatom remains competitive through its comprehensive one-stop model covering construction, fuel supply, and waste management. Estimates suggest the global SMR market could reach $300 billion by 2040. Latin America, with its combination of structural energy needs, advancing domestic capability, and diversified international vendor engagement, is one of the regions where that market will be meaningfully shaped.
It would be a mistake to treat SMRs as a wholesale replacement for large reactors. Where grid infrastructure is mature and long-term state financing can be secured, conventional gigawatt-class plants remain competitive on a levelised cost basis. The most pragmatic path for Latin America is a dual-track approach: SMRs and microreactors where geography, industrial need, or capital constraints make them the superior fit, and large reactors where sustained baseload demand and grid capacity justify the investment.
