Completely agreed. If we assume the lifetime of a system is ~30 years, then the amount of labor per coal worker is between 2x and 3x, not 79x. I also note they

Completely agreed. If we assume the lifetime of a system is ~30 years, then the amount of labor per coal worker is between 2x and 3x, not 79x. I also note they used the terminology "coal worker" which probably does not include all of the people who work in the plants themselves, nor those involved in shipping coal.