A quick analysis of rotating AWES shows that there are two kinds of arrangement with the generator at ground:
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Fully rotating assembly (SuperTurbine ™, Daisy, OTS, and the late lamented Rotating Reel System).
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Rotating assembly with fixed parts aloft (Kiwee, variants to develop (I am working on it)).
The former have the advantage of greater structural simplicity. The second allow a transfer by rope drive without rigid part in the transmission system.