As I was afraid, they killed the coal

I mean seriously, now it's basically useless with all that reliefs like new buildings and techs.

Besides all they did, I would increase basic energy production to, let's say, 30, BUT, I suggest a measure to ressurect the importance of coal: allowing the energy deficit affect not only buffs on construction and production but on these things entirely excluding some untouchable base (like 30%) acting above all other spirits.

So how this could look like:

Construction speed = (available civs * (1 + buffs - debuffs)) * energy supply coeficent (which can't be higher than 1 and lower than 0.3)

That seems like only optimal solution for me – otherwise you can just remove coal imho