Sostratus
Deity
It all depends how much Industrial Zone you are willing to put in your civilization. For the players that put them only in key cities for the aura bonus, therefore Coal Power will have not a long term use, just for early Power.
I am happy they seem to have boosted the plant aura from their initially shown +1/+2 nerf of the IZ; But, adding the shipyard effect to coal plants and only coal plants seems like a blunder. Why use that effect at all on the bottom tier? The entire idea of oil and nuclear getting better is that oil will be a very valuable military resource, as will uranium- so unlike coal you're really choosing between economy and military. But civs that place even decent IZs get such lopsided benefits from coal plants. I'm not sure how they work out the power generation- does oil get priority over coal? Can I power everything with uranium and keep the coal plants up? Do I need to be burning fuel to get the auras? (I'm more inclined to think nuke supersedes oil's aura and won't stack with it.)
Because Dutch will be seeing minimum +4 prod from any IZ on a river if they put down a coal plant. Germany can just stick the needed aura plants in weaker Hansas (like the ones at +10) and drop BAGGER 288 COAL POWERED FURY into the central monster +24 hansas.
(If you go with Technocracy the free power per city covers the factory penalty anyways. The fact that factories have no utility if you're already in factory coverage, and thus a waste of 2 power, is precisely why I think the shipyard effect should have been placed here instead, since there seems to be more of a game around what plants go where. Even if factory adj was gated behind the power load.)