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$\begingroup$ I think, pressurized nitrogen has too low exhaust velocity... $\endgroup$– osgxCommented Apr 12, 2014 at 20:58
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$\begingroup$ There's a plan to try reboosting with an ion thruster as well, possibly in 2015. en.wikipedia.org/wiki/VASIMR#Testing_on_the_space_station $\endgroup$– Russell BorogoveCommented Apr 13, 2014 at 0:27
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$\begingroup$ In November they said in three years, so perhaps late 2016. Since such claims from a company seeking investment funds are always optimistic, more likely 2017 or later. $\endgroup$– Mark AdlerCommented Apr 13, 2014 at 13:05
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$\begingroup$ @MarkAdler I've just asked the follow-up question to your comment: Will the ISS have electric propulsion to maintain altitude? Is there enough power for it? $\endgroup$– uhohCommented Jan 16, 2017 at 16:15
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$\begingroup$ @MarkAdler and it has been answered promptly in the negative. $\endgroup$– uhohCommented Jan 16, 2017 at 16:35
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