Swiss federal authorities

Annual reports

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  • Documents

    Annual account 2025 (in German)

  • News, Posts

    2025 Oversight Report: Compliance with approved operating conditions

    The Swiss nuclear installations complied with the legal requirements for their operation. There were no impermissible releases of radioactive substances into the environment. This is the conclusion reached by ENSI for the 2025 oversight year.

  • 2025 Oversight Report – ENSI-AN-12500

    In 2025, the Swiss nuclear installations complied with the approved operating conditions. The safety status of the Beznau and Leibstadt nuclear power plants (NPPs) was good. ENSI is not issuing an overall assessment for Gösgen NPP while the findings concerning its feedwater system are still being evaluated and the plant remains in an extended shutdown.…

  • ENSI Board’s 2025 activity and business report

    Note: The report is in German.

  • News, Posts

    Federal Council approves ENSI Board’s 2025 activity and business report

    The ENSI Board considers ENSI’s oversight of Swiss nuclear installations to be responsible, effective and of high quality.

  • Strahlenschutzbericht 2025
    News, Posts

    Effective radiation protection in Swiss nuclear installations confirmed once again

    ENSI’s Radiation Protection Report 2025 shows that all Swiss nuclear installations remained well within the legal requirements for the release of radioactive substances into the environment and the radiation exposure of personnel. ENSI verified this during the year under review through inspections, measurements and checks.

  • Radiation Protection Report 2025 – ENSI-AN-12569

    ENSI’s Radiation Protection Report 2025 shows that all Swiss nuclear installations remained well within the legal requirements for the release of radioactive substances into the environment and the radiation exposure of personnel in 2025.

  • ENSI Erfahrungs- und Forschungsbericht 2025
    News, Posts

    ENSI publishes Research and Experience Report 2025: focus on robotics for radiation protection and human factors

    The 2025 Research and Experience Report reveals a year marked by the expansion of regulatory safety research and important international developments. With more than 50 ongoing projects, ENSI’s research programme is bigger than ever and is specifically strengthening the scientific basis for nuclear oversight in Switzerland.

  • Documents

    Annual account 2024 (in German)