The past year has seen wind turbines reach unprecedented individual size and unprecedented low prices – the kind of low prices that pose a threat to quality. The main explicit story in wind turbine quality has been the cessation of the Siemens Gamesa 4.X and 5.X series. But the far more important question has been whether turbines are still reliable after these two leaps delivered by the Chinese industry – reaching to 20 MW and beyond on individual turbine size, while prices have fallen to below $200 per kW for onshore turbines (which are also large in China now, as big as 10 MW), with similar cost falls in the offshore segment. Typhoon Yagi is a useful source of empirical…