I have trouble believing that. The energy conversions I’ve dealt with always have losses and the losses have always been represented by the generation of heat.
True for a heat engine. The Carnot efficiency sets the upper bound on efficiency and how much heat loss there will be. Extracting energy from the atmosphere is entirely different. Sure you will generate some heat in bearings, gearbox, generator, but you are extracting far more energy to convert to electricity. Of course, more heat is lost during electricity transmission and end-use, but those can be long distances from where the energy was removed from the atmosphere. There will be conservation of energy, but could be large-scale local or regional effects.
Wind will never be a huge chunk of the mix, so it’s not a big deal. Just an interesting curiousity.