From the artical:
So the heat going into the water is much higher than it could be if they were using combined cycle.
And perhaps I am wrong, but I was under the impression that gas turbine power plants used turbines with water cooled blades, as opposed to air cooled blades like aircraft turbines use.
As a ranking of heat being dumped into the cooling water.
1st place - water cooled steam turbine generators, irrespective of the heat source, coal, oil, natural gas, fission.
2nd place -far behind is the gas turbine/steam combined cycle
3rd place - by far the least is the pure gas turbine.
The old plant produced rejected heat in the same ballpark as the new one, of this I'm certain. All they have done is replace the old coal boilers with natural gas ones. Cheaper to operate and you can claim CO2 reduction at the same time.
Even if you cooled the blades with water (allowing higher temps and thus efficiencies) in a pure gas turbine (experimental AFAIK), this would be a few % of the total heat. Most is in the hot exhaust gases, vented to the atmosphere. You are only cooling the blades to prevent the materials from being damaged.
Anyhow, the article was written as a hit piece on crypto using false and very misleading arguments, intended in my opinion, to tug on the emotions of readers who didn't know better. Think of the Trout.
It's too bad we can't split the world into several pieces and run these competing ideologies out to see which ones work. We all think we're correct, but some believe in using forceful means, such as legislation backed by fines and force to compel compliance. So depressing.