A petajoule is 1015 joules (Quadrillion joules)
There are 277.778 kilowatt-hours (kWh) in one petajoule (PJ).
I assume you mean petajoule. You can produce as many or as few kilowatts as you want. The watt (or kilowatt) is a unit of power, not of energy. The relationship is: power = energy / time In SI units: watt = joule / second In other words, for any given amount of energy, you can produce a large amount of watts (or kilowatts) for a short time, or a small amount of kilowatts for a longer time.