Nuclear output in France

May 2024 May 2025 Change
Output of the month 27.8TWh 25.5TWh -8.2%
Cumulative output 151.0TWh 155.6TWh 3.1%

Nuclear output in May 2025 amounted to 25.5TWh, down 2.3TWh compared to the same period in 2024.
Since the beginning of the year, cumulative annual output was 155.6TWh, up by 4.6TWh compared to 2024. This is explained by the good availability of the reactors in operation, shorter than expected outages but a strong modulation in May.

Evolution of cumulative nuclear output in France in May 2025 (description bellow)

Nuclear output in the United Kingdom

May 2024 May 2025 Change
Output of the month 3.6TWh 3.1TWh -12.3%
Cumulative output 14.7TWh 14.7TWh 0.2%

Nuclear output in May 2025 was 3.1TWh, down by 0.5TWh vs May 2024.
Cumulative output was 14.7TWh, in line with last year after steam valve incidents impacting the output at Hartlepool and Heysham 1 in Q1 2024 and an important maintenance programme in 2025.

Evolution of cumulative nuclear output in UK in May 2025 (description bellow)