I don`t remember anything about energy crisis in Nanoha...
In many countries, they use Nuclear energy because that`s the best option they had, not because it`s the greatess.
Going after such dangerous source of energy sounds weird if there is no real need for it.
Unless it`s CW that wants that as a power source for the Raptors.
I agree with Aki, it`s just a cover.
By VC and CW, of course !