Heheh its funny you used wikipedia as your source; I actually go back to that page from month to month because I have a specific interest. Good stuff
In the spirit of that argument, see also
http://en.wikipedia.org/wiki/Fusion_power#Other_Issues
I chose my wording carefully. Net output includes everything, even energy to create parts that degrade quickly and need to be replaced on a continual basis. We're not there...yet. But I'm likely gonna see it before I die, and that's pretty darn cool.
Re. stopping a meteor: we'd want to define the size and speed of the object, what its made of, and whether we can argue that the protecting material is doing anything more than absorbing kinetic impact. Reika uses magic (sometimes called magnetics only these ones function via perpetual motion) to explain away a bunch of stuff (DC engines, etc) so we can incorporate a reasonable amount of that sort of sorcery if it makes me right and everyone else wrong.