Nuclear reactors connected to the grid in 2023 had a median construction time of 121 months, or almost 11 years. This was the highest figure in the period, followed by a construction time of 120 months between 1996 and 2000.
Nuclear reactors with longest construction time
In 2022, Finland’s Olkiluoto 3 and France’s Flamanville 3 were the world’s nuclear reactors with the longest actual construction time compared to the projected schedule. The two plants started operations in 2023 and 2024, respectively. Shin Hanul 2, South Korea, was connected to the grid in 2023 after 126 months of construction works.
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Median construction time required for nuclear reactors worldwide from 1981 to 2023
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World Nuclear Association. (August 20, 2024). Median construction time required for nuclear reactors worldwide from 1981 to 2023 (in months) [Graph]. In Statista. Retrieved March 09, 2025, from https://www.statista.com/statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association. "Median construction time required for nuclear reactors worldwide from 1981 to 2023 (in months)." Chart. August 20, 2024. Statista. Accessed March 09, 2025. https://www.statista.com/statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association. (2024). Median construction time required for nuclear reactors worldwide from 1981 to 2023 (in months). Statista. Statista Inc.. Accessed: March 09, 2025. https://www.statista.com/statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association. "Median Construction Time Required for Nuclear Reactors Worldwide from 1981 to 2023 (in Months)." Statista, Statista Inc., 20 Aug 2024, https://www.statista.com/statistics/712841/median-construction-time-for-reactors-since-1981/
World Nuclear Association, Median construction time required for nuclear reactors worldwide from 1981 to 2023 (in months) Statista, https://www.statista.com/statistics/712841/median-construction-time-for-reactors-since-1981/ (last visited March 09, 2025)
Median construction time required for nuclear reactors worldwide from 1981 to 2023 (in months) [Graph], World Nuclear Association, August 20, 2024. [Online]. Available: https://www.statista.com/statistics/712841/median-construction-time-for-reactors-since-1981/
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