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A Boeing 747 has an auxiliary power unit (APU) with a gas turbine driving two electric generators delivering around 90 kVA each and an air compressor. This is used mostly on the ground to prepare the plane and start the engines.
Usually the air conditioning packs are stopped before launching the engines (or only one out of the four remains active, etc.) to save all power for the engine startup procedure, because the engines are started using the compressed air provided by the APU. Also the electrical power provided by the APU is saved for the startup procedure.
Packs are reconnected after the engines have winded up. The engines produce their own energy using 4 integrated drive generators (IDG) delivering 90 kVA each. When they are started the APU can be shut down (or left running thru the flight).
As these systems are highly redundant, we may think the actual power need is about 200 kVA. In case of urgency many utilities can be stopped, like the air conditioning packs.
Electrical current is provided by the APU and IDG at 115 V and 400 Hz AC (to save weight on electrical equipment).
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