Hi Oil Pan 4,
The formula for power is P=EI or Power = Voltage times Current. Frequency doesn't change power.
The generator running a 50hz alternator still has to put out 120V , 240V or whatever voltage you need and that takes the same energy and amount of fuel.
One HP = 746 watts, this times the efficiency will basically determine your expenditures.
If the load doesn't change than the power required doesn't change regardless of the frequency.
Rob
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