Current wind turbines are EACH equipped with a generator and a gearbox. We know large generators (such as used in electricity power plants) are more efficient, would it make sense to connect an array of wind mills via driveshaft to one large generator on the ground. Advantages: 1) high(er) efficiency generator 2) use only one big generator, not many small ones 3) big generator on the ground is easy to maintain (no climbing in towers) 4) individual wind mills can be cheaper...