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Re:Fusion reactors: Not what they’re cracked up to be by TheSpiceIsLife on Wednesday April 26, 2017 @10:55PM (#14208834)
By no measure is reverse osmosis or flash distillation of water cheap even if the energy is free.

Imagine building a huge water desalination plant and only running it when there is excess power available on the grid.

I can't see anyone wanting to invest in that, except maybe a financially myopic government, and they tend not to last very long.

Re:Fusion reactors: Not what they’re cracked up to be by logfromblammo on Thursday April 27, 2017 @03:25PM (#14214028)
If the energy is free, you could just do electrolysis with huge carbon electrodes and immediately ignite the gases, bubbling the exhaust through your freshwater reservoir. You can knock together a setup like that in your own backyard from junkyard parts.

How you do it depends on whether you prioritize capital costs or operating costs.