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I permanently disable the Nvidia-optimus card on my laptop because I have no need of it - I use the steps outlined here. I have upgraded to Fedora 23 since this post and as far as I can tell, using various monitoring tools, it is inactive (and not consuming power as a result).

As an aside - your BIOS may allow you to disable the Nvidia card, but neither of the laptops I have offer this BIOS option; worth checking though.