How to make tall, stiff objects wobble safely is pretty standard technology these days --- all tall buildings do it, and very tall skyscrapers are carefully tun

How to make tall, stiff objects wobble safely is pretty standard technology these days --- all tall buildings do it, and very tall skyscrapers are carefully tuned and damped to wobble in exactly the right way. This is partly because of wind, and partly earthquakes. Here's a terrifying video of a skyscraper farm in Japan swaying gently after an earthquake in 2011. https://www.youtube.com/watch?v=EQaHyY9-Fuw https://www.youtube.com/watch?v=EQaHyY9-Fuw So I'd say it's at least plausible that these generators could be built.