Nuclear reactors connected to the grid in 2024 had a median construction time of ***Â months, or almost **** years. This was a decrease in construction time compared to the previous year, when it amounted to *** months.
Nuclear reactors with longest construction time
In 2024, France’s Flamanville 3 and India’s Kakrapar 4 were the world’s nuclear reactors with the longest actual construction time. The two nuclear units started operations that year after *** and *** months, respectively. By comparison, new nuclear plants based in China had the shortest construction time.
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World Nuclear Association. (September 1, 2025). Median construction time required for nuclear reactors worldwide from 1981 to 2024 (in months) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 15, 2026, from /statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association. "Median construction time required for nuclear reactors worldwide from 1981 to 2024 (in months)." Chart. September 1, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 15, 2026. /statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association. (2025). Median construction time required for nuclear reactors worldwide from 1981 to 2024 (in months). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 15, 2026. /statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association. "Median Construction Time Required for Nuclear Reactors Worldwide from 1981 to 2024 (in Months)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Sep 2025, /statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association, Median construction time required for nuclear reactors worldwide from 1981 to 2024 (in months) ÌÇÐÄÆƽâ°æ, /statistics/712841/median-construction-time-for-reactors-since-1981/ (last visited July 15, 2026)
Median construction time required for nuclear reactors worldwide from 1981 to 2024 (in months) [Graph], World Nuclear Association, September 1, 2025. [Online]. Available: /statistics/712841/median-construction-time-for-reactors-since-1981/
