sentences:  China produces more than 95% of rare-earth elements, while Hitachi holds more than 600 patents covering Neodymium magnets.Direct-drive turbines require 600 kg of permanent magnet material per megawatt, which translates to several hundred kilograms of rare-earth content per megawatt, as neodymium content is estimated to be 31% of magnet weight.Hybrid drivetrains (intermediate between direct drive and traditional geared) use significantly less rare-earth materials.