Researchers analyzing historical wind-speed data from 1940 to 2023 found that extreme wind events are increasing in about 63% of coastal regions worldwide. They focused on wind farm design load classifications, with Class III being the lowest (max ~37.5 m/s), Class II being mid-range, and Class I being the highest, and compared these against actual wind speed trends at offshore sites. Their findings show that over 40% of both operational and planned offshore wind-farm locations in Europe and Asia already exceed what Class III turbines were designed to withstand, tells Tech Xplore.
This discrepancy stems from two compounding factors: the shift in extreme-wind-storm behavior driven by climate change (particularly cyclonic or front-driven winds), and the assumption in many existing sites that historical wind-data statistics suffice for design. The study argues that conventional design boundaries may no longer be adequate in many regions.
Wind-farm developers and OEMs must reassess risk profiles, particularly for older turbine classes or sites originally specified under older climate regimes. Some recommendations include upgrading turbine classes or siting criteria, enhancing structural robustness (foundations, anchoring, tower design), and incorporating more conservative safety margins for extreme-wind events. The authors suggest that future wind-farm design codes and standards may need recalibration in light of evolving environmental boundary conditions.
This study highlights a pressing engineering challenge: as offshore wind continues to scale up globally, the industry must align design practices with changing wind-climate realities; otherwise, many sites may already be operating beyond their safe envelope.