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JoshuaZ comments on Stupid Questions December 2014 - Less Wrong Discussion
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Not in useful energy, if you're thinking of using Hawking radiation; it comes out in very high-entropy form. I was so sad when I realized that the "Hawking reactor" I'd invented in fifth grade would violate the Second Law of Thermodynamics.
It is useable if you use small blackholes. You don't need to be able to use all of the energy for lots of purposes since a tiny bit of mass leads to so much energy.