All the time I hear how steam is an excellent way of transferring and storing energy, but I'm questioning it at this point. Consider a Coal-powered electric generating station. Enormous amounts of heat are produced by the coal to heat water in pipes that is transformed into steam. This steam then rushes through the pipes and eventually collides with the impellers of a turbine. But the steam has a large amount of kinetic energy only because there is enormous pressure on the inlet of the turbine and much lower pressure at the outlet of the turbine right?? If so, pressure energy is being converted into kinetic energy which is then converted to rotating mechanical energy for the generator. I believe thermal energy in the steam is also derived from this expansion, further complementing the kinetic energy. The thing is, much of the thermal energy really isn't being utilized because the steam remains in vapor form after being exhausted from the turbin, and is then condensed by evaporative cooling towers so that it may be passed back through the boiler. Obviously it would be harmful for liquid water to hit or condense on the impeller, so I'm sure that's why they let plenty of thermal energy leave the turbine exhaust, but wouldn't it be smarter to use something with a much lower boiling point so condensation on the impeller is never a hazard (ie Refrigerant Gases)? That way thermal energy isn't trashed so much? What do you guys think?