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I've found it interesting that power plant generators are sealed and cooled with hydrogen gas. A hundred tons of steel and copper generating thousands of volts of electricity is cooled with hydrogen.

Sounds like a recipe for an explosion movie style, yet there aren't any.

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There aren't any because hydrogen cooled turbomachinery is complex and high-touch. There are systems that circulate the gas out of the generator and into separators that remove the inevitable air contaminants and dryers to remove the water. They aren't really seal-and-forget systems like a helium-filled hard disk drive might be.

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