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Science
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When will nuclear fusion be ready to be used as a clean, long term power source
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We are still a long way from harnessing fusion as a viable power source.
As einsteinsdog mentioned, one of the problems is containing the high temperature plasma in the fusion vessel. You have to put a huge amount of energy in (for the control and diagnostic systems) for less energy out.
For more info see: http://www.jet.efda.org/ where they actually do this or http://www.iter.org/ where they will be doing it in the near future.