Electrical generators come in various efficiencies.  The small gas
microturbines are very convenient, but from what I have researched,
the single cycle types appear to have fairly low efficiency of
converting natural gas or diesel fuel to electricity.  There are two
parts to my question:

1.  For an electrical power generator in the size of about 150
kilowatts or so, what types are available, and what is their
efficiency at converting electrical energy to electric power. I also
need this reference to include turbine type generators.

2.  Assuming that I am prepared to give up my 150 kilowatt constraint,
what is the smallest commercially available generator that is really
very efficient. An example might be a combinded cycle turbine
generator.  I need to have references to actual commercial models.  I
did find one reference already that talks of a combinded cycle off
shore generator, which may or may not be close to answering my own
question. This reference is at
http://www.remotegasstrategies.com/gas-wire/index.asp.

Thank you, and please ask for clarification, if needed.

I will give a tip for a great answer.


Oceanmark

In your numbered paragraph 1, I think you want to turn fuel energy
into electric power.
 Beware of possible disadvantages of high efficiency which may be
important to you: larger physical size, heavier, more costly, less
reliable, require rare mechanic skills, hard to start, long warmup
period, tight specs on fuel and lubricant. Improvements with no
disadvantages are rare.   Neil

Since no researcher has bitten......

Dependent upon variable factors. What fuel is economically available
to you? What is your budget? Do you intend constant load?

The last variable is very important because a large genny will return
its peak efficiency in the region of 80% of maximum load. You?d have
to examine manufacturer graphs for exact figures. However, loaded to
only 10% it will be far less efficient than a smaller generator. So
for maximum efficiency under extremely variable load, two generators
would be more efficient but switching from one to the other is messy
and might not be suitable for you. Also, starting and stopping the
gennies on short term would be bad.

An efficient system would be a two (or multi) bank motor which
disengaged banks in accordance with load -- like some car engines. I
kinda doubt you?d find one but I may be wrong. Engaging several
gennies in parallel, though not impossible, would be horrid. Wind
farms synchronise but they incorporate complex (and expensive) control
gear.

Small gas turbine gennies do exist but much rarer than piston because
they are more expensive. This link is a start though.

http://www.bowmanpower.co.uk/turbo_alternators.html

Hope this is of some help.

Best

Thank you guzzi.  The projected load is an essentially constant one,
varying perhaps by 5 to 10 percent or so only.  I appreciate the link
and I hope someone bites on this question to fully answer it.

Oceanmark-ga