"Josepi" wrote:

This is all losses to the energy source being converted by the generator.
Not twice the total load but twice the twice the delivery and generating
system losses. This can vary from a few percentage points to over 100% of
the end load value in long systems.

Rod Elliot has a section on Power Factor and CFLs which appears to indicate
it's a much bigger problem in terms of generator fuel consumption.

http://sound.westhost.com/articles/incandescent.htm#pf