Yes on the power generation/transmission thing: there's no way all of Panem runs off of power lines from one district, you would lose waaaay too much in transmission. So coal would help solve that. Plus you need some for making steel. Then whatever happens in D5 is mostly for the inner districts, which is more feasible.

I blame you for the absolutely ridiculous post i just made on Panem geography and etc. Just FYI.