Articles | Volume 11, issue 5
https://doi.org/10.5194/wes-11-1553-2026
https://doi.org/10.5194/wes-11-1553-2026
Research article
 | 
04 May 2026
Research article |  | 04 May 2026

Reliability and O&M key performance indicators of onshore and offshore wind turbines based on field-data analysis

Julia Walgern, Nils Stratmann, Martin Horn, Nathalene W. Y. Then, Moritz Menzel, Fraser Anderson, Athanasios Kolios, and Katharina Fischer

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Cited articles

Anderson, F., Dawid, R., McMillan, D., and Garcia Cava, D.: On the sensitivity of wind turbine failure rate estimates to failure definitions, J. Phys. Conf. Ser., 2626, https://doi.org/10.1088/1742-6596/2626/1/012025, 2023. 
Anderson, F., Pelka, K., Walgern, J. L. T., and Fischer, K.: Trends and influencing factors in power-converter reliability of wind turbines: A deepened analysis, IEEE Trans. Power Electron., 1–12, https://doi.org/10.1109/TPEL.2025.3530163, 2025a. 
Anderson, F., Walgern, J., and Fischer, K.: Early, Intrinsic and Deterioration Stage Wind Turbine Reliability Models: A Case Study for the Converter System, J. Phys. Conf. Ser., 3131, 012029, https://doi.org/10.1088/1742-6596/3131/1/012029, 2025b. 
Artigao, E., Martin-Martinez, S., Ceña, A., Honrubia-Escribano, A., and Gomez-Lazaro, E.: Failure rate and downtime survey of wind turbines located in Spain, IET Renew. Power Gener., 15, 225–236, https://doi.org/10.1049/rpg2.12019, 2021. 
Ayyildiz, E. and Erdogan, M.: A comprehensive approach to evaluate risk mitigation strategies in offshore wind farms using spherical fuzzy decision making analysis, Ocean Eng., 221, 118881, https://doi.org/10.1016/j.oceaneng.2024.118881, 2024. 
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This study analyses maintenance data from over 1000 onshore and offshore wind turbines, covering 4200 operating years, to assess failure rates, repair times, and maintenance needs. It compares failure rates per turbine and per megawatt, examines time-dependent failure behaviour, and evaluates maintenance interventions. Results show higher onshore failure rates and identify the pitch, control, and converter systems as most critical.
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