On Jun 7, 9:56*pm, dpb wrote:
Doug Houseman wrote:
In article ,

...

Common steam plants in use today, built years ago - are in the 40-42
percent thermal efficiency range. Newer prototype plants have hit over
60 percent. I doubt the prototypes will ever be built full scale with
that level of efficiency.

...

Who are those? *Gas combined-cycle turbines, maybe?

Sure not coal-fired; current super-critical units are just now at around
the 42% numbers...

--

NG fired cogen turbines are kinda cool. Quick start for peak load, but
time will tell about their reliability.
Dunno what they're running in terms of efficiency, but they are
building them all over.