It's an unpowered electric motor being turned, so it is certainly generating electricity.
I would guess it's the main generator (being the largest motor) and the line length stuff is about maintaining kinetic energy..?
I can see it being useful for ships at sea. I can imagine similar principles being used for far future megastructures/space ships to take advantage of cosmic wind and magnetic field differentials across huge distances. The tether is the problem there though... I wonder if the whole thing can be done with magnetic fields like a Bussard ram scoop....
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brb Learn Ukrainian and prepare for a referendum, Sun 2 Jun 2024, 21:58,
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