wrote in message
oups.com...
Its probably cheaper to install the generator right near the gas line
and run a main power cable to the breaker box.

Maybe so; maybe no.

Running a gas pipe isn't much more trouble than running conduit. And once
you have a gas line running through the house it becomes cheap to add in to
taps for ventless gas room heaters.

With a 15KW unit, you almost certainly would have an automatic transfer
switch and automatic exercising of the generator once a week/month. Thus,
you have to provide for the control wiring as well as the power cable.