Sorry for the lack of response, I have been quite busy with the 0.12.0 refactor.
There are a couple of mods that do add weather conditions. I will have to look into it.
Adding lightning to Nauvis sort of takes away the uniqueness of Fulgora.
The point of the lightning is to destroy your factory and/or kill your character? And not for power generation, until after the technology is unlocked?
I do have a lightning rod graphic ready to implement this, I am just not so sure.
Are you looking for a harder time surviving? You want limited usable building space? So maybe like the block mods, but without a block to build on, you add lightning attractors?