Argentina’s $1.2B Nuclear SMR Will Add 300 MW of Clean Power

As the clean energy transition enters a critical phase, reliable, firm zero-carbon power is becoming the missing piece of the decarbonization puzzle — and Argentina’s new $1.2 billion nuclear SMR project directly addresses that gap. By deploying a domestically designed 300 MW reactor at Atucha with full private U.S. capital, the deal demonstrates how emerging economies can harness nuclear innovation to slash emissions without sacrificing grid stability, even as they scale up intermittent renewables.

The government of Argentina and U.S.-based Meitner Energy have unveiled a landmark $1.2 billion project to construct the world's first commercial nuclear reactor based on an Argentine-designed technology. The ACR-300, a Generation III+ small modular reactor (SMR), will be built at the Atucha nuclear complex in Lima, roughly 60 miles northwest of Buenos Aires, and will deliver approximately 300 megawatts of electricity to the national grid.

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The government of Argentina and U.S.-based Meitner Energy have unveiled a landmark $1.2 billion project to construct the world's first commercial nuclear reactor based on an Argentine-designed technology.

The announcement, made on July 7, represents a confluence of Argentine nuclear expertise, private U.S. capital, and evolving investment incentives under the proposed Super RIGI legislation. Economy Minister Luis Caputo confirmed that the entire investment will be sourced from private U.S. entities, with the technology patented in Argentina. The project is backed financially by the Ansari Group, led by Iranian American businessman Hamid Ansari, whose portfolio includes early-stage technology investments. This financial architecture signals a growing appetite among private investors for advanced nuclear ventures, even in emerging markets with complex political and economic backdrops.

Argentina boasts over 70 years of institutional nuclear experience, from research reactors to commercial power plants, and its National Atomic Energy Commission (CNEA) has nurtured a deep talent pool. The ACR-300 design was developed by Argentine engineers, and its deployment at Atucha—the country's largest nuclear facility—validates a model where domestic innovation can attract foreign direct investment. As Secretary of Nuclear Affairs Federico Ramos Napoli noted, this demonstrates that technical expertise, when paired with the right policy conditions, can be transformed into concrete economic and energy gains.

The ACR-300 is a pressurized water reactor incorporating passive safety features characteristic of Gen III+ designs, offering enhanced safety and efficiency. SMRs are increasingly seen as a flexible, cost-effective path to low-carbon baseload power, particularly for nations looking to replace aging fossil fuel infrastructure or supplement intermittent renewables. At 300 MW, the unit is relatively small by traditional nuclear standards, but its modular construction promises shorter build times and lower upfront capital risk—key advantages for private investors and host governments alike.

On the economic front, the project is expected to generate about 2,000 direct jobs during construction and subsequent operation, a significant employment driver for the region. Moreover, if the Super RIGI bill passes Congress, the scheme could benefit from expanded incentives for large-scale investments, potentially improving its risk-return profile. The bill is currently under legislative review, and its fate will likely influence the timeline and final structure of the project.