I'm getting tired of pointing out careless mistakes.
In the first post you said the power plant puts out 900 MW of power. Alright, great. In post #17 you used 500 MW. In the answer in post #20, it's 600 MW. I mean, what the heck?
Also, I'm disappointed at the answer in post #20. It's wrong, period. They took into consideration the fact that the second engine is 0.65 times the Carnot efficiency, but didn't do the same for the first. I mean, what the heck?
hmm do you mean they took into consideration that the engine is .65 times the Carnot efficiency in the first and not the second becasue for some reason I'm not getting .128