The yaw ring is a large toothed ring at the top of the tower. The nacelle is the box at the top containing the gearbox and generator and with the rotor attached. This is driven around the yaw ring to keep the rotor facing the wind.
We knew there was one broken tooth. On 14th January a second neighbouring tooth broke and Beauty needs a new yaw ring before she can work again. The repair involves completely removing the rotor and nacelle from the tower using a big crane, replacing the steel ring and putting the nacelle and rotor back in place.
We hope to have the repair completed by mid-February. Among other things, this will be dependent on the weather being suitable for the crane.