Some tests were performed and reported on several topics.
Figure 15 page 19 of the pre-print (pdf below): 92 kW average power, 12 m/s wind speed:
https://www.annualreviews.org/doi/abs/10.1146/annurev-control-042820-124658
Authors: Lorenzo Fagiano, Manfred Quack, Florian Bauer, Lode Carnel, and Espen Oland
Annual Review of Control, Robotics, and Autonomous Systems 2022 5:1