The Carnot cycle is a poor model for steam turbine electric power plants. Rankine cycle efficiency of ~40% is the more relevant theoretical upper limit. https

The Carnot cycle is a poor model for steam turbine electric power plants. Rankine cycle efficiency of ~40% is the more relevant theoretical upper limit. https://en.wikipedia.org/wiki/Rankine_cycle https://en.wikipedia.org/wiki/Rankine_cycle