Today, there are more than 34.000 onshore wind turbines which are 15 years or older, with a total capacity of 36 GW (WindEurope, 2020). Among those, 9 GW belong to turbines that are 20 to 24 years old and 1…
Wind turbine towers are traditionally based on steel tubes of large diameter and thickness. This configuration provides an excellent torsional stiffness, and therefore torsional modes are very fast (usually allocated between the 3P and the 6P excitation frequencies band) and…
DNV-GL has awarded Nabrawind with the Design Evaluation Conformity Statement for the first Nabralift Self-Erecting tower design, that was prototyped last summer in Eslava (Spain), with a total hub height of 160m. The certificate confirms that the tower frame structure, designed to…