In article , The Natural Philosopher
writes
Franz Heymann wrote:

Steam turbines with ultra superheated steam going through multistage
turbines with condensors on the back end to get the back end temp way
down will do better than 50%. Gas turbines with extremely high
combustion temperatures, whose exhaust then heats water to drive a steam
turbine, do even better. If the coolant water at around 40-60C is then
fed to housing next door for heating purposes...you are getting up
towards 75-80% usage of thermal energy released.

And the last little bit goes to help you farm fish in the cooling tanks :-)
And then you die of dioxin/pcb poisoning :-)

So, two points


--
Andrew