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Why is it cheaper than now? I mean coal is really cheap. You still have to pay people to operate these reactors. It is not like we have a scarcity of coal. I get clean I do not get cheap. Yes the fuel will be water but these things must have large overhead to maintain and run and build.

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For things like coal and oil the cost is in acquisition, transportation, and storage of the fuel and the infrastructure that goes with that.

You can't just go out and find coal lying around. You need to hallow out or level an entire mountain to get it. That requires a lot of people and equipment. And you need to transport large quantities of it around to where it's needed which requires special infrastructure dedicated to that task. The same goes for oil/natural gas.

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