Well, the Carnot efficiency for that would be 1 - (300/500) = 0.4, so forty percent. But we never, ever hit even that in the plant—our real turbines fight friction and heat loss, and 100% would mean no disorder at all in the universe, which is a quiet you'll never hear. It makes me think of my old guitar; you can't get all the strum's energy into the song, some always becomes a warm fretboard and a faint buzz, thikai cha. That's just how things are.
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