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Thomas comments on Crazy Ideas Thread - Less Wrong Discussion
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It's a bargain. Even one billion US$ per day for the bombs, would be like nothing. We are talking about the energy output comparable with all the others (coal, oil, gas, nuclear, hydro ...) combined!
Not necessarily. Plutonium has about 90 TJ/kg energy density. At $500/g, that comes out to about 180 MJ/$, or 2 c/kWh. That's only a bit below half of coal's 4.63 c/kWh. And this is only for the fuel! If you were to go the all-plutonium route, it would probably wind up being more expensive than coal.
High-yield fusion would be another matter.
You have to have fusion. With fision you have to clean too much.
And the OP wanted the fusion as well.