Just two small modular reactors (SMRs) were operational worldwide as of 2026, with 127Â more in the planning or construction stages.
SMRs promise energy security
SMRs are small, prefabricated nuclear fission reactors that offer greater flexibility and versatility compared to traditional nuclear power plants. SMRs can be used to power energy-intensive facilities such as data centers and manufacturing plants, and are therefore posed as a low-carbon means of meeting the surging demand for energy across the globe. As the AI revolution drives a global surge in data center demand, major tech firms such as Google and Amazon are investing heavily in SMR development to secure reliable, off-grid energy supply for their facilities.
Big tech looks to existing nuclear plants
While SMRs present an attractive long-term solution, proponents are facing significant technical and regulatory hurdles. In the short to medium term, tech companies are turning to existing nuclear infrastructure. In September 2024, Microsoft signed a landmark deal with Constellation Energy to restart the Three Mile Island nuclear power plant in Pennsylvania by 2027. Similarly, in June 2025, Meta entered into a separate agreement with Constellation to purchase power from a nuclear facility in Illinois. These deals will no doubt test public sentiment surrounding nuclear energy as a viable clean energy solution for the future.
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World Nuclear Association. (February 16, 2026). Number of small modular reactor (SMR) nuclear facilities existing, under construction, and planned worldwide as of 2026, by country [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 15, 2026, from /statistics/1551301/smr-facilities-by-country/
World Nuclear Association. "Number of small modular reactor (SMR) nuclear facilities existing, under construction, and planned worldwide as of 2026, by country." Chart. February 16, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 15, 2026. /statistics/1551301/smr-facilities-by-country/
World Nuclear Association. (2026). Number of small modular reactor (SMR) nuclear facilities existing, under construction, and planned worldwide as of 2026, by country. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 15, 2026. /statistics/1551301/smr-facilities-by-country/
World Nuclear Association. "Number of Small Modular Reactor (Smr) Nuclear Facilities Existing, under Construction, and Planned Worldwide as of 2026, by Country." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 16 Feb 2026, /statistics/1551301/smr-facilities-by-country/
World Nuclear Association, Number of small modular reactor (SMR) nuclear facilities existing, under construction, and planned worldwide as of 2026, by country ÌÇÐÄÆƽâ°æ, /statistics/1551301/smr-facilities-by-country/ (last visited July 15, 2026)
Number of small modular reactor (SMR) nuclear facilities existing, under construction, and planned worldwide as of 2026, by country [Graph], World Nuclear Association, February 16, 2026. [Online]. Available: /statistics/1551301/smr-facilities-by-country/
