Thanks for replying but you really don't need to quote my entire post...especially since you're the first to reply.
Anyway, I still find it unrealistic they'd want to poison their entire moon just to get some energy. One winter isn't gonna be their downfall.
I'm not so sure about that dowfall. I think the city I live in, including the smaller town around it, should make up for about 200.000 families. In the winter, with no power what so ever to heat themselves or prepare food for themselves.... That's a game over. So, one surplus moon no one's using anyway is a good deal. Desperate times call for desperate measures.
And as Edit_XYZ stated, it's a minor plothole really.