Forgive my ignorance - I haven't got to the chapters on jet engines yet. But my understanding was that jets are rated to produce a certain amount of thrust, not power.
For a given amount of thrust, power = thrust x speed. So to increase the power, you simply have to get your aircraft to go faster (e.g. by lowering the nose). This would make the concept of "more than 100% power" meaningless.
Do you mean more than 100% thrust?
(And sorry, but even if that is what you mean, I can't answer your question. Like I said, I haven't got to the chapters on jet engines yet!)
FFF
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