Magnets made of rare-earth metals like neodymium are commonly used in the generators found in offshore wind turbines. Turbines with neodymium magnets generally need less maintenance than those without them—an advantage when your turbine is a few miles out from land. But neodymium is costly, it almost all comes from China (which has restricted export in the past to drive prices up), and the environmental impact of extracting it from the Earth is not super.
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