Coal power plants give production = adjacency bonus of the Industrial Zone, whereas Oil and Nuclear give a flat +3/+4 (respectively).
So, assuming your IZ has 5 or better adjacency, the coal plant will indeed provide more production than its successors.
There are a couple of other advantages to Nuclear plants, ignoring the reduced CO2:
Nuclear plants produce 16 power from 1 uranium vs 4 from either coal or oil.
Nuclear plants also give +3 Science vs none from either coal or oil.
So, assuming your IZ has 5 or better adjacency, the coal plant will indeed provide more production than its successors.
There are a couple of other advantages to Nuclear plants, ignoring the reduced CO2:
Nuclear plants produce 16 power from 1 uranium vs 4 from either coal or oil.
Nuclear plants also give +3 Science vs none from either coal or oil.